A mixed-methods study of physiological reactivity to domain-specific problem solving: methodological perspectives for process-accompanying research in VET

Empirical Research in Vocational Education and Training, May 2017

Background The study aims to investigate stress-inducing potentials of problem-solving activities (e.g., goal elaboration, decision making, and information seeking) within an authentic problem-solving task from the business administration domain. Furthermore, the study aims to investigate stress-reducing potentials of personal characteristics (e.g., self-efficacy beliefs, vocational experience). Methods A mixed-methods design was chosen to investigate in-depth processes during domain-specific problem solving, using a computer-based office simulation. Personal characteristics were assessed by questionnaires and tests before the task. Cardiovascular and electrodermal reactivity were measured continuously during the task. Problem-solving activities were coded on the basis of screencasts and think-aloud recordings. Changes in physiological reactivity were estimated on the basis of problem-solving activities and personal characteristics via multilevel regression analyses. Results The problem-solving task in general was associated with stress reactions. There were no significant main effects of self-efficacy beliefs, vocational experience, and general intelligence. However, changes in heart rate depended on an interaction between vocational experience and activities including goal elaboration and definition. Furthermore, problem-solving activities including decision making were significantly associated with an increase of amplitudes of detected skin conductance responses. A negative correlation found between the problem-solving score and the LF/HF ratio indicates that higher physiological arousal during the problem-solving task was accompanied by lower problem-solving performance. Conclusion It seems to be worthwhile to integrate physiological methods in domain-specific research practice to a greater extent. An essential advantage of such methods can be seen in the measurements’ relative independence from self-reported biases that seems to be especially important for high-frequency measurements within the scope of process-accompanying surveys and/or when investigating implicit aspects of action processes: from this, some new methodological perspectives for empirical research in VET could be developed. However, one has to consider that physiological measures alone are not objective or meaningful in this context, but rather have to be interpreted in their interplay with psychological parameters (e.g., experiences, behaviors) or with particular situational stimuli.

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A mixed-methods study of physiological reactivity to domain-specific problem solving: methodological perspectives for process-accompanying research in VET

Kärner Empirical Res Voc Ed Train A mixed‑methods study of physiological reactivity to domain‑specific problem solving: methodological perspectives for process‑accompanying research in VET Tobias Kärner Background: The study aims to investigate stress-inducing potentials of problemsolving activities (e.g., goal elaboration, decision making, and information seeking) within an authentic problem-solving task from the business administration domain. Furthermore, the study aims to investigate stress-reducing potentials of personal characteristics (e.g., self-efficacy beliefs, vocational experience). Methods: A mixed-methods design was chosen to investigate in-depth processes during domain-specific problem solving, using a computer-based office simulation. Personal characteristics were assessed by questionnaires and tests before the task. Cardiovascular and electrodermal reactivity were measured continuously during the task. Problem-solving activities were coded on the basis of screencasts and think-aloud recordings. Changes in physiological reactivity were estimated on the basis of problemsolving activities and personal characteristics via multilevel regression analyses. Results: The problem-solving task in general was associated with stress reactions. There were no significant main effects of self-efficacy beliefs, vocational experience, and general intelligence. However, changes in heart rate depended on an interaction between vocational experience and activities including goal elaboration and definition. Furthermore, problem-solving activities including decision making were significantly associated with an increase of amplitudes of detected skin conductance responses. A negative correlation found between the problem-solving score and the LF/HF ratio indicates that higher physiological arousal during the problem-solving task was accompanied by lower problem-solving performance. Conclusion: It seems to be worthwhile to integrate physiological methods in domainspecific research practice to a greater extent. An essential advantage of such methods can be seen in the measurements' relative independence from self-reported biases that seems to be especially important for high-frequency measurements within the scope of process-accompanying surveys and/or when investigating implicit aspects of action processes: from this, some new methodological perspectives for empirical research in VET could be developed. However, one has to consider that physiological measures alone are not objective or meaningful in this context, but rather have to be interpreted in their interplay with psychological parameters (e.g., experiences, behaviors) or with particular situational stimuli. - Background Contemporary research on domain-specific problem solving in vocational education and training (VET) uses sophisticated statistical approaches for the assessment of structure models of domain-specific problem-solving competence (e.g., Achtenhagen and Winther 2009; Nickolaus et al. 2012). Furthermore, some of these measurement approaches also focus on emotional states, which occur in response to problem confrontation (Rausch et al. 2016). A complex problem is characterized by a barrier between a given state and an intended goal state that a person would like to achieve but does not immediately know how to achieve. Effort has to be put into cognitive and behavioral problem-solving activities in order to reduce a given barrier (Funke 2012; Newell and Simon 1972). To overcome such barriers, action-regulation processes are necessary. Such processes require different tasks and activities including goal elaboration and definition, information seeking and recording, forecasting and planning, decision making, performing goaloriented actions and operations, and action control and reflection (Dörner and Wearing 1995). Complex problems are a potential source of stress and arousal because they are characterized by informational and analytical complexity, uncertainty, a lack of transparency, a high degree of connectivity of variables, time pressure, and unclearly specified problem-solving operators (Dörner and Wearing 1995; Funke 1991, 2012; Mayer and Wittrock 2006). In the vocational context, for instance, everyday problem solving in back-office departments has been identified as a main source of everyday work-related stress as vocational problems provoke states of high psychological arousal and negative emotional states (Rausch et al. 2015). Whether a vocational task is perceived as an easy job or as a complex challenge mainly depends on the individual’s competence as determined by, among other things, prior experience, domain-specific knowledge, skills, and self-efficacy beliefs (Bandura 1994; Dörner 1996; Dörner and Wearing 1995; Goode and Beckmann 2010; Haerem and Rau 2007; Mayer 1994). There is a gap in the previous literature concerning empirical work on the association between vocational problem-solving activities and stress responses. Thus, this article aims to investigate how and to what extent specific problem-solving activities are associated with physiological responses if multiple problem-solving activities are considered simultaneously. Furthermore, it addresses the question how and to what extent physiological reactions to problem-solving activities are affected by personal characteristics (such as general intelligence, domain-specific expertise, and self-efficacy beliefs). In an effort to deepen understanding of problem-solving processes, an in-depth analysis of vocational problem solving will be provided. Stress‑inducing potentials of problem‑solving activities Dörner and Wearing (1995) emphasize that the process of action regulation within problem solving can be subdivided into the following partial activities: goal elaboration and definition; information seeking and recording; forecasting, and planning; decision-making; performing goal-oriented operations; and monitoring and reflection of outcomes. The authors state that these different phases do not always show up in subjects’ behavior, nor does the sequence always strictly occur. In the remaining portion of this section, stress-inducing potentials of these partial problem-solving activities will be described on the basis of a literature review. First, the problem solver has to elaborate on what should be the preferred outcome of his/her problem-solving activities. Often, the main goal is not clearly defined and global goals (e.g., “choose the optimal supplier”) must be decomposed into subgoals (e.g., “do a supplier value analysis,” “elaborate different weighting criteria,” etc.) which in turn need further specification. As a consequence of the decomposition of global goals into many different subgoals and of the normally limited time frame, it is necessary to order the priority of goals and subgoals (Dörner and Wearing 1995). The elaboration and definition of (possibly conflicting) goals and subgoals within the problem-solving process can be associated with both positive and negative emotions. Since complex problem situations are characterized by a low degree of transparency and a lack of perceived control, they are likely to trigger feelings of uncertainty and anxiety (Dörner and Wearing 1995; Reither and Stäudel 1985; Schwarz and Bless 1991). If goals can be self-defined by an individual, then goal disengagement and goal reengagement behaviors can compensate for the experience of distress which is associated with the continued pursuit of a goal that cannot be attained (Wrosch et  al. 2003). If the realization of a goal seems to be realistic, or if a distressing goal-incongruent strategy can be changed for a better one, one could feel positive emotions such as happiness or relief (Lazarus 1991, 1999). Such “adaptive goal processes” (Folkman 2008) seem to be realistic in problem situations where the individual has the autonomy for self-defining goals, but not to that extent in the case of non-self-defining goals (cf. Gollwitzer and Wicklund 1985). After goal definition, information has to be collected and evaluated in order to build hypotheses about the system (Dörner and Wearing 1995). Therefore, in analytic problem solving, relevant information has to be derived by deductive reasoning from different (possibly ambiguous) information sources (Brand-Gruwel et al. 2009; Leutner et al. 2005). Furthermore, the problem solver usually does not know a priori which information is most important to reach a goal or subgoal. That is because he or she is not able to perceive and process the full range of information presented, but just a small part which he/she considers to be important (Dörner and Wearing 1995). Thus, stressinducing potentials of information-processing requirements are discussed within the scope of “information overload” (Schneider 1987). Eppler and Mengis (2004) reviewed a wide range of existing literature on management-related overload situations and found that managerial decisions in general and strategic analysis activities in particular act as sources of information overload. Fischer et  al. (2012) state that information reduction is a most important aspect of coping with complexity within problem solving as great amounts of information may overstrain human processing capacity. In that regard, cognitive load theory recognizes two main sources of stress-inducing potentials: the intrinsic cognitive load of a problem, referring to the internal structure of the information that is given to the problem solver and that he or she needs to acquire to reach the intended goal, and the extraneous cognitive load, associated not with the inherent structure of the problem-related information, but with the manner of its presentation (Sweller 1988; Sweller et al. 2011; see Bley et al. (2015) for an application of cognitive load theory in the context of VET). If the problem solver has collected enough information about a task’s structure and its actual state, it is necessary to predict what will happen after specific actions and operations have been performed. Thus, one has to anticipate and forecast possible effects and consequences of actions and operations under conditions of uncertainty. Within problem solving, the planning of sequences of consecutive actions and operations will usually be necessary (Fischer et al. 2012). The complexity of action planning depends on the structure of the domain and content one has to cope with, and on the number of potential actions available to influence the system’s development (Dörner and Wearing 1995). After anticipating pros and cons of planned actions and operations, one has to make decisions in order to choose those specific actions and operations which should actually be performed. In complex problem-solving scenarios, decision making usually occurs under uncertain conditions. Because of time pressure and the amount of information that has to be processed, one can very seldom make exhaustive evaluations of all options and their possible consequences. Thus, decisions are usually based on strategies (so called “heuristics”) using less information and only a limited amount of information processing capacity (Fischer et al. 2012). Furthermore, in complex problem-solving tasks, it is never quite clear whether a specific decision really has the intended effects (Dörner and Wearing 1995). Acting under conditions of uncertainty (i.e., if few or ambiguous pieces of information are available) bears the risk of possible negative consequences. Within problem situations, such possible negative or even undesired outcomes have to be anticipated and evaluated (Dawson et  al. 2011). Sembill et  al. (2013) emphasize the importance of such unconscious evaluative reactions to internal and external stimuli (so called “affects”). The authors state that affects remain unconscious, as they emerge from neurophysiological systems (in particular the limbic system). If unconscious evaluations exceed a critical arousal threshold, distinct emotions (which are conscious, intensive, and directed toward the evaluated contents) may arise. Contradictory affective evaluations may lead to states of high arousal, which are likely to trigger stress emotions. Sembill et  al. (2013, p. 202) state that “affects and emotions thus serve as a continual feedback on success and failure in need satisfaction and goal achievement and, therefore, are vital in any processes of problem solving.” After coming to a decision, the problem-solver has to perform intended and goal-oriented actions and operations. As usual in daily office work, one has to use a notepad and/or a spreadsheet application and apply calculating procedures. Mental operations can be accompanied by perceived stress and physiological stress responses (e.g., Hjortskov et  al. 2004; Zapf 1993) as such operations strain working memory capacity (cf. Sweller 1988). On the other hand, well-planned and analytic problem-solving activities are associated with achieving important goals at work (Folkman et  al. 1986a, b), with positive reappraisal, and with a significant reduction of psychological symptomatology (Folkman et al. 1986a, b). Right after performing operations, one has to control and reflect on the effects of the performed actions and evaluate success with reference to the defined goals. As mentioned above, adaptive goal definition and redefinition processes are associated with a reduction of psychological distress (Folkman 2008; Wrosch et  al. 2003), and reaching a defined goal is associated with positive emotional states (Lazarus 1991, 1999). If an action is evaluated as unrewarding or unsuccessful, that appraisal can be associated with stress emotions like worry and anxiety (cf. Conroy et al. 2002). Electrodermal and cardiovascular reactivity to mental stress Selye (1973, p. 692) defines stress as “the nonspecific response of the body to any demand made upon it.” The concept of physiological arousal is a key component of the stress response (Winsky-Sommerer et al. 2005) and it is closely linked to states and processes of the autonomic nervous system (ANS) (Cacioppo et al. 1996). The most commonly assessed indices of states related to ANS activation are based on cardiovascular [e.g., heart rate (HR), heart rate variability (HRV)] and electrodermal (e.g., skin conductance responses) reactivity, as they are sensitive to valence and arousal (Mauss and Robinson 2009). Electrodermal components are the skin conductance level (SCL) and the skin conductance response (SCR), as they are used as common indicators of sympathetic neuronal activity. The SCL is defined as the tonic level of electrical conductivity of the skin, and the SCR is defined as the phasic change in the skin’s electrical conductivity (Braithwaite et  al. 2013). Skin conductance is affected by cortical (for example, the orbitofrontal cortex) and subcortical (the amygdala, for instance, responds to uncertainty and ambiguity) brain areas. These areas subserve processes of attention, anticipation, evaluation of stimulus significance, and decision making (Dawson et  al. 2011; Mauss and Robinson 2009). HRV as another indicator of the reactivity of the ANS reflects the activity of the parasympathetic (which controls physiological resting functions) and sympathetic (primarily activated under stress) nervous systems (Kemeny 2003). In this conjunction, the ratio of low-frequency components [low-frequency domain (LF), 0.04–0.15  Hz] to high-frequency components [high-frequency domain (HF), 0.15–0.4 Hz] is used as an indicator for the relation of sympathetic (reflected by low-frequency components) and parasympathetic (reflected by high-frequency components) activity. The LF/HF ratio is used as a frequency domain measure. The root mean square of successive differences (RMSSD) is another HRV indicator. RMSSD is used as a time domain measure and primarily reflects the reactivity of the parasympathetic nervous system (Malik et al. 1996; Mauss and Robinson 2009). Heart rate (variability) and skin conductance responses vary in terms of whether they primarily reflect sympathetic activity, parasympathetic activity, or both: SCL predominantly reflects activity of the sympathetic nervous system; HR reflects both sympathetic and parasympathetic activity; HRV is closely associated with parasympathetic activity (Larsen et al. 2008; Mauss and Robinson 2009). The reactivity of the ANS is a major component of affective and emotional responses. For instance, several studies report anxiety- and fear-related increases in HR, SCL, and SCR and decreases in HRV (indicated by decreases of parasympathetic activity related to increases of sympathetic activity) (see Kreibig 2010 for a broad literature review). Concerning specific psychophysiological biomarkers, Chandola et al. (2010) conducted a systematic literature review. The authors state that the findings for specific biomarkers in the various studies should be interpreted with caution because of several limitations, such as publication aspects (e.g. publication bias), the inconsistent use of psychophysiological biomarkers between studies, and the inconsistent use of stimulus materials. Even though there are several limitations, the authors conclude that there is empirical evidence that work stressors are related to elevated stress responses including sympatho-adrenal responses. However, taken by themselves, electrodermal and cardiovascular measures are non-specific indicators of physiological arousal (Kohlisch and Schaefer 1996). Such indicators are not meaningful per se but have to be interpreted in their interplay with psychological parameters (e.g., traits, experiences, behaviors) and/or with particular situational stimuli. Existing studies show that both HR (e.g., Clays et al. 2011; Hjortskov et al. 2004; Taelman et al. 2011) and skin conductance (e.g., Reinhardt et al. 2012) increase in response to mental stress. The LF/HF ratio shows an increase under stress, which indicates a predominant state of the sympathetic nervous system under stress-inducing conditions (e.g., Hjortskov et al. 2004; Isowa et al. 2006). The RMSSD shows a decrease under stress (e.g., Baert et al. 2012). Furthermore, there are also associations between electrodermal and cardiovascular measures. For instance, Lazarus et al. (1963) report an intraindividual correlation between heart rate and skin conductance of r = 0.5 under stress-inducing conditions. From a methodological point of view, electrodermal responses can be used as involuntary physiological measures, as they reflect evaluative processes (Dawson et al. 2011; Starcke and Brand 2012). Dawson et al. (2011) conclude that such anticipatory SCRs may reflect the conscious expectancy of a stimulus with a possible significant (negative) consequence or outcome. The SCR may also reflect unconscious affective processes and/or serve as a somatic marker that guides future decision making and helps the individual to act and get oriented in risky and/or uncertain situations [the anticipatory effects of SCR were intensively investigated and discussed within the “somatic marker hypothesis” by Damasio (1994); see also Bechara et al. (1997)]. Besides the SCR, the HRV also responds to situational threat and uncertainty. In that regard, Thayer et al. (2012) conducted a meta-analysis and found that a number of cerebral regions, including the amygdala and ventromedial prefrontal cortex, are associated with HRV regulation. With regard to action-regulation processes, Botvinick and Rosen (2009) state that adaptive and goal-oriented action requires that the prospective rewards of an action be weighed against its attendant costs associated with mental effort. The authors found an anticipatory SCR prior to actions, resulting in a high level of cognitive demand. They conclude that requirements for effort-intensive cognitive control are anticipated during the selection of specific actions and thus, that action selection is guided by the anticipation of action outcomes. Concerning physiological reactivity to mental load, Blitz et al. (1970) conducted an experimental study where they systematically varied mental loads in order to investigate effects on HR and HRV (indicated by sinus arrhythmia). The authors found that HR was positive affected by increasing levels of mental load, whereas HRV was negatively affected. Kohlisch and Schaefer (1996) found that the HR reflects the attentional aspects of mental load. The skin conductance is assumed to be a sensitive indicator of the emotional consequences of mental load, as SCRs reflect an affective arousal caused by information processing demands. Associations between stress and performance To perform well in a problem-solving task depends not only on adequate knowledge application or on executing the right mental operations, but also on appropriately coping with stress and arousal while working on a task (cf. Heller et al. 2010). Existing research shows that physiological stress affects working memory and long-term memory performance by the impairment of memory retrieval (e.g., Cornelisse et al. 2011; Smeets 2011). Furthermore, research on test anxiety shows that working under stress impairs attention and produces cognitive interference and task-irrelevant thoughts that result in reduced levels of task performance (Deffenbacher 1978; Eysenck et al. 2007). Vogel and Schwabe (2016) state that moderate or high stress levels may hinder memory retrieval and the integration of new information into existing knowledge structures, resulting in an inhibition of deep understanding of concepts. For instance, Dörner and Pfeifer (1992) found in an experimental study on stress and problem solving that those participants who worked under stress conditions more frequently decided in favor of ineffective operations compared to the participants in the control condition. Such “actionism” behavior is not goal-directed but just directed toward a demonstration of competence [summarized in Dörner and Wearing (1995)]. Stress‑reducing potentials of general intelligence, domain‑specific expertise, and self‑efficacy beliefs The construct of action competence is a complex system including, among other things, intellectual abilities, domain-specific knowledge and strategies, motivational tendencies, and volitional control systems, all of which components are required to fulfill vocational demands (Weinert 2001). Dörner and Wearing (1995) emphasize the capacity of conscious thinking and the feeling of being able to act effectively as important factors for triggering information processing when coping with complex problem situations. According to Rausch and Wuttke’s (2016) model of domain-specific problem-solving competence (see also Rausch et al. 2016; Sembill et al. 2013), cognitive, emotional, and motivational components of competence have to be taken into consideration. The cognitive comprehension of the problem’s core and the application of domain-specific knowledge include the identification of needs for action and information gaps, information processing, coming to well-founded decisions, and appropriate communicating of decisions. Furthermore, expectations about one’s efficacy related to solving a specific problem are important. Gottfredson (1997a) defines intelligence as “a very general mental capability that, among other things, involves the ability to reason, plan, solve problems, think abstractly, comprehend complex ideas, learn quickly and learn from experience.” Intelligence (especially the g factor) predicts performance at work settings because it is an important ability to deal with complex information in the workplace (Gottfredson 1997b). According to Sternberg (1998), intelligence is composed of analytical (e.g., evaluating, comparing), creative (e.g., discovering, imagining), and practical (e.g., applying, implementing) abilities that are crucial within problem-solving processes. Cederblad et  al. (1995) found that high intellectual functioning increases resilience. Werner (2000) considers average/ above-average intelligence as a protective factor, but she also notes that there is little evidence that high intellectual abilities alone promote effective coping. For successful problem solving, not only intellectual abilities but also domain-specific knowledge is essential (e.g., Achtenhagen and Winther 2009; Sembill et al. 2013). Tenenbaum et al. (2008) emphasize domain-specific expertise as an important coping resource in arousal-provoking performance situations. The authors conclude that high pressure prevents novices from performing complex skills well and competently because attention is shifted to task-irrelevant concerns, and the lack of automaticity results in an increase of procedural errors. Experts, on the other hand, have acquired coping strategies that enable them to minimize stress in arousal-provoking situations and remain focused on the task. According to Nitsch (1982; summarizing Tenenbaum et al. 2008), expertise may be determined through the extent to which a problem-solver has assimilated and accommodated the arousal-coping strategies, which are linked through exposure to problem-solving practice. Continuous and repeated exposure to arousal-provoking problem situations shifts the operational mode from an intentional mode to an automated mode. Such adaptive processes reduce vulnerability, anxiety, and uncertainty (Ibid.). Bandura (1994, p. 71) defines perceived self-efficacy “as people’s beliefs about their capabilities to produce designated levels of performance that exercise influence over events that affect their lives.” There is broad evidence in existing literature that self-efficacy beliefs can have buffering effects on perceived stress (e.g., Ebstrup et al. 2011; Hahn et al. 2011) and on somatic stress responses (e.g., Bandura et al. 1982, 1988; Sanz and Villamarin 2001). Bandura (1994) states that rapid technological development at the workplace puts high requirements on higher problem-solving skills and self-efficacy to cope effectively with demanding vocational activities. For instance, Blair et  al. (1999) used a computer-based problem-solving task and found a significantly negative correlation between stated self-efficacy and stated worry during problem solving. Rausch et al. (2016) used problem-solving tasks within authentic office simulations and found that situational confidence in one’s competence was significantly positively associated with tolerance for ambiguity and uncertainty and with maintaining positive and active emotional states. Research questions and hypotheses Three research questions (RQ) including corresponding hypotheses (H) arise from the review of theoretical foundations and existing findings. RQ1: Is working on a problem-solving task in general associated with physiological stress reactions and perceived stress, and to what extent are specific problem-solving activities associated with physiological stress responses if multiple activities are considered simultaneously? First, the study aims to investigate stress-inducing potentials of problem-solving activities within an authentic problem-solving task from the business administration domain. Existing literature provides evidence that certain problem-solving activities are accompanied by an increase of stress responses. These activities include: goal elaboration and definition (e.g., Dörner and Wearing 1995; Reither and Stäudel 1985), information seeking and recording (e.g., Eppler and Mengis 2004; Sweller 1988), forecasting and planning (e.g., Dörner and Wearing 1995; Fischer et al. 2012), decision-making (e.g., Botvinick and Rosen 2009; Dawson et  al. 2011), performing goal-oriented actions and operations (e.g., Hjortskov et al. 2004; Zapf 1993), and action control and reflection (in the case of not reaching a defined goal or subgoal) (e.g., Conroy et al. 2002; Folkman 2008; Wrosch et al. 2003). It will be assumed that the problem-solving task in general is associated with stress (H1a). Furthermore, it will be assumed that problem-solving activities including goal elaboration and definition (H1b), information seeking (H1c), information recording (H1d), forecasting and planning (H1e), decision-making (H1f ), performing goal-oriented actions and operations (H1g), and action control and reflection (H1h) are associated with stress responses. RQ2: How, and to what extent, are physiological stress reactions during domain-specific problem-solving activities affected by personal characteristics? Second, the study aims to investigate stress-reducing potentials of personal characteristics. Existing literature provides evidence that general intelligence increases resilience (Cederblad et  al. 1995). Domain-specific expertise and knowledge are assumed to be an important coping resource in arousal-provoking performance situations (e.g., Nitsch 1982; Tenenbaum et al. 2008). Self-efficacy beliefs are assumed to buffer effects of demanding conditions and to be essential to cope effectively with demanding vocational activities (e.g., Bandura 1994; Ebstrup et al. 2011). It will be assumed that general intelligence (H2a), domain-specific expertise and knowledge (H2b), and self-efficacy beliefs (H2c) buffer stress-responses to problem-solving activities. RQ3: To what extent is the problem-solving performance associated with stress? Third, the study aims to investigate associations between problem-solving performance and stress. Existing research shows that stress affects performance by the impairment of memory retrieval and by cognitive interference and task-irrelevant thoughts (e.g., Cornelisse et  al. 2011; Eysenck et  al. 2007; Vogel and Schwabe 2016). It will be assumed that stress is negatively associated with problem-solving performance (H3). Eighteen volunteers were recruited through advertisements at the University of Bamberg (Germany).1 All participants were graduate students in a university course related to business administration. This was a necessary condition of working in the domainspecific problem scenario. Participants with serious medical conditions (e.g., cardiac arrhythmias) were excluded from the study because of possible confounding effects with regard to the physiological measurement. The study was conducted in accordance with the Declaration of Helsinki, and all participants provided written, informed consent. Procedure, sequence of events, and timeline The participants were tested individually and the procedure, sequence of events, and timeline were standardized for all participants. First, the participants were welcomed and told they would have to solve a problem from the domain of business administration using a computer-based office simulation. Thereafter the participants took a general intelligence test and filled in a questionnaire assessing personal characteristics. After 1 The current study uses the same computer-based office simulation as a previous study of Kärner et  al. (submitted). With regard to the validity of the current findings, the samples have been compared to each other [cf. the sample in Kärner et al. (submitted): Treatment Group, n = 41; Control Group, n = 17; the sample in the current study, n = 18]: using ANOVAs, there are no significant group differences with regard to BMI (p  =  .366), work experience in years (p = .312), and general intelligence (p = .103); using χ2 tests, there are no significant group differences with regard to sex (p = .992) and vocational education and training certificate (% completed) (p = .403); with regard to age, participants of the Treatment Group (M = 24.85, ±3.46 SD) from the study of Kärner et al. (submitted) are significantly younger than the participants in the current study (M = 27.39, ±3.07 SD) (F(2, 73) = 3.955, η2 = .098, p = .023, Bonferroni-corrected p value = .035). this they watched a video tutorial on using the technical features of the simulated office environment. Figure 1 graphs the sequence of events and timeline. After the video tutorial, a rest period of 5 min was scheduled and the baselines of the electrodermal and cardiovascular parameters were measured. The baseline measurements were aggregated per person via arithmetic means. The baseline values were used for calculating the baseline-corrected measures during the task (see below). The participants then started to work on the computer-based office simulation for 30  min. The participants were confronted with an authentic and complex domain-specific problem-solving task that is common in everyday office work in back-office business administration. The scenario required the participants to select a supplier by calculating prices, balancing pros and cons of different weightings of various quality criteria, and doing supplier value analysis. The computer-based office simulation provided the typical features of an authentic office environment such as a file system with hierarchical folder structure, an email client, a calculator, a notepad, and a spreadsheet application. The problem can be classed as a complex analytic problem because it features many interrelated variables, multiple conflicting goals, non-transparent information, and time pressure (Rausch et al. 2016). The office simulation was used as stimulus material because it offers a test format that has been extensively validated for large-scale measurement of the problem-solving competence of industrial business management assistants (Rausch et al. 2016; Seifried et al. 2016). Therefore, the stimulus material offers an authentic test format that has ecological validity, but that can be used under controlled and standardized conditions. After finishing the problem-solving task, the participants were given a 5-min rest period. Perceived stress was assessed before and after working on the problem scenario. Cardiovascular and electrodermal parameters were measured continuously during the task and during the rest periods (before and after the task). Participants’ problem-solving behaviors were recorded via screencasts and think-aloud recordings using the software Screencast-O-Matic®, and they were coded subsequently via video-based analysis. Figure 2 graphs the technical realization of screencasting, think-aloud recording, and timesampling analysis. ( baseline measurements) Fig. 1 Procedure, sequence of events, and timeline Fig. 2 Technical realization of screencast recording, think-aloud recording, and time-sampling analysis Measures and operationalization Participant characteristics Via questionnaire, information was collected on sex, age, and weight and height (both used for calculating the body mass index, BMI). Sex, age, and BMI are variables to control possible confounding effects on the physiological measures. In that regard, Steptoe et  al. (1996) found that HR responses to mental stress were larger in younger than in older individuals (independent from sex). Steptoe and Wardle (2005) found that BMI was associated with impaired post-stress recovery of systolic pressure and diastolic pressure independently of age, gender, and baseline cardiovascular activity. Doberenz et al. (2011) found that sex affected non-specific skin conductance fluctuation amplitudes and the coefficient of skin conductance variation: men had significantly lower values compared to women. Furthermore, BMI significantly lowered the number of non-specific skin conductance fluctuations and was negatively but not significantly associated with SCL and SCL standard deviation with small to medium effect sizes. Vocational experience was operationalized by the reported work experience that is assumed to be an indicator for domain-specific expertise and knowledge. Nine participants (50% of the sample) have a VET certificate, and all VET certificates refer to a vocation from the domain of business and administration: 1 trained retail salesman, 1 management assistant in office communication, 2 qualified bank clerks, 1 commercial assistant, 2 legal assistants, 1 management assistant in freight forwarding, and 1 industrial management assistant. General intelligence was measured using the German version of the Culture-Fair Intelligence Test (CFT 20-R) (Weiß 2006), assessing fluid intelligence via four subtests: “series completion” (15 items), “classifications” (15 items), “matrices” (15 items), and “topolo Participants’ self-efficacy beliefs were measured using an adapted scale from Schwarzer 4 = “Exactly true.” In reference to Dörner (1976, 1996), Dörner and Wearing (1995), and Bransford and Stein (1993), six main types of activities within the problem-solving process were coded on the basis of the screencast videos and think-aloud recordings of participants’ problem-solving behaviors. Time-frames at 1-s intervals were coded via video-based analysis ® using the Videograph software (Rimmele 2013).2 Consensual validation was used, and critical aspects were discussed by two professional coders in order to find common coding solutions. The 1-s coding intervals were aggregated per person at 10-s intervals via sum scores, to synchronize the assessed problem-solving activities with the physiological measurements. The following problem-solving activities were coded: will be the best choice.” weight to the purchase price.” 1. Goal elaboration and definition The participants had to identify the problem’s core and elaborate and define goals and subgoals; e.g., “I have to do a supplier value analysis and give more weight to acquisition prices.” 2. Information seeking and recording Business documents of various types (invoices, let ters, notes, etc.) were provided in the simulation, and no single document provided a complete solution to the problem. The participants had to examine and read different types of information (e.g., invoices from different suppliers) with regard to their relevance for solving the problem (information seeking). Furthermore, the participants noted relevant information for later processing on the notepad (information recording). 3. Forecasting and planning The participants anticipated possible effects of their planned actions and forecast possible consequences; e.g., “If I change the weighting of the quality criteria in that way, than the supplier from the Czech Republic may be 4. Decision making After balancing pros and cons of a planned action, participants made a decision and chose specific actions and operations; e.g., “Then I’ll give more 5. Performing goal-oriented actions and operations After coming to a decision, the par ticipants performed specific actions and operations; e.g., calculating the supplier benchmark on the basis of the chosen weighting by using the spreadsheet application. 2 For the multilevel analysis application it was important that each time period was defined as exactly 10 s, and each 10-s time period could be characterized by problem-solving activities as well as by physiological responses (both data sources have to be synchronized for the multilevel regression analysis). The coding system used (Videograph® software by Rimmele 2013) enables 1-s time intervals as the smallest coding unit. Therefore, for each 1-s time interval, one can assess whether a problem-solving activity category does or does not occur in actual behavior. In that term, time-sampling procedure is equal to event-sampling procedure. We did not use event-sampling procedure in its “pure” form, because event-sampling tends to produce varying time frames (e.g. >10 s), which leads to problems with the data synchronization for the multilevel regression analysis. 6. Action control and reflection The participants controlled the effects of their per formed actions and evaluated their success with reference to the defined goals or subgoals. Where necessary (e.g., if the action was unrewarding), participants had to return to a previous phase of the problem-solving process and try to reach the goal or subgoal again. In the analyses of the screencasts and think-aloud recordings, only cases where participants were not able to reach a goal/subgoal were identified and coded as such. In such cases the participants had to return and try again; e.g., “Now I get an odd solution and I have to check it up again.” The above-mentioned problem-solving activities are assumed to refer primarily to the internal structure of the task that was given to the problem solver (cf. intrinsic cognitive load, Sweller 1988). However, aspects of the presentational characteristics and possible problems with the handling of the computer-based office simulation were also coded (cf. extraneous cognitive load, Ibid.). In that regard, for example, participants had problems regarding copy-and-paste functions, spreadsheet application use, open files, or software hanging problems. Problem‑solving performance Problem-solving performance ratings are based on categories developed and tested in a large-scale study of problem-solving competence in the business domain (Rausch et al. 2016). The coding was performed using Rating Suite software to display the participants’ solutions. The coding guide provided definitions, coding rules, and coding examples for the following categories (maximum points in parentheses): “identifying needs for action and information gaps” (13); “processing information” (21); “coming to well-founded decisions” (5); “communicating decisions appropriately” (7) [for further information to the coding guide see Rausch et  al. (2016)]. Participants’ problem-solving performance was operationalized by the sum of ratios of achieved scores to maximum scores (in terms of relative scores for each category). Overall, participants achieved a score of 1.92 (±.50 SD, Min. = 1.24, Max. = 2.96, within a possible range from 0 to 4). Physiological measures Electrodermal reactivity When assessing electrodermal activity via equipment from movisens® (edaMove; movisens 2015), the skin conductance level and the mean amplitudes of detected skin conductance responses were used as indicators. The electrodermal activity data were low-pass filtered, and the filter frequency was 0.1 Hz. Measuring-time intervals of 10 s were chosen and, for each output interval, the mean values of the internally calculated values were used for calculation. SCR amplitudes were automatically detected, and specification of event markers was neither necessary in the current analysis nor possible with the technical equipment used. The default minimal rise time for the detection of SCR was 0.05 µS/s, the default minimal amplitude for the detection of SCR was 0.1 µS, and the default maximal rise time for the detection of SCR was 0.9 s (cf. movisens 2015). Cardiovascular reactivity Participants’ cardiovascular reactivity was measured continuously during the task via a chest belt and storage devices that recorded the data wirelessly on an integrated memory chip. The internal sample frequency was 1 kHz, and the HR raw data were transmitted to the software used (Medeia Ltd.®) in order to calculate the HRV indicators. The following HRV parameters were taken into account: the LF/HF ratio was used as the frequency domain measure, as it mirrors the sympathovagal balance (cf. Malik et al. 1996; Sleight and Bernardi 1998); the root mean square of successive differences (RMSSD) was used as the time domain measure of HRV (cf. Malik et al. 1996). The measures were aggregated per person at 10-s measurement intervals via arithmetic means in order to synchronize the cardiovascular and the electrodermal measurements. Taking into account individual changes from baselines, the baseline values (SCL, SCR, HR, LF/HF ratio, RMSSD) were subtracted from the successive 10-s interval measures as recommended by Roberts et al. (2004) to obtain baseline-corrected values. Perceived stress Perceived stress (PS) was assessed using a visual analogue scale (cf. Luria 1975). The participants were asked to rate how stressed they felt by placing a cross on a 100 mm horizontal line labeled “Not at all stressed” at the left end (0 mm) and “Extremely stressed” at the right end (100 mm). The visual analogue scale was also used to assess the internal validity of study conditions, assessing whether working on the problem was even perceived as stressful. Statistical analyses Changes in perceived and physiological stress over the general periods (before, during, and after the task; see Fig. 1) were analyzed via repeated-measures analysis of variance (ANOVA), with time of measurement as the repeated within-subjects factor (aggregated measures for the physiological measures: before, during, and after the task). Greenhouse-Geisser-adjusted p values for the analysis of multiple measures and Bonferronicorrected p values for the multiple comparisons to control for alpha error inflation are reported. Pearson product-moment correlations were calculated in order to identify significant associations between the physiological measures and the independent variables. Multilevel analyses were used to estimate the changes in physiological measures during the task based on personal characteristics and problem-solving activities. Standardized values were used. The analyses were conducted using the SPSS® Mixed Procedure™. The restricted maximum likelihood method was chosen, as it is adequate for small data sets (Heck et  al. 2010). A first-order autoregressive covariance structure with homogenous variances was modeled, because the successive measures (nested within participants) were assumed to be auto-correlated to each other (cf. Hox 2002; Littell et al. 2000). The following hierarchical data structure (measurement intervals nested within participants) was modeled: • On Level 2 (18 participants), participant characteristics (e.g., BMI, vocational experience, general intelligence) and the individuals’ baseline values at perceived stress were modeled; • On Level 1 (overall 1792–3226 person-related 10-s measurement intervals), problem-solving activities including (1) goal elaboration and definition, (2) information seeking, (3) information recording, (4) forecasting and planning, (5) decision making, (6) performing goal-oriented actions and operations, and (7) action control and reflection were modeled. In addition, the time from starting with the task was modeled on Level 1. Thus, each 10-s measurement interval within the problem-solving process was characterized by different problem-solving activities and by the timepoint within working on the task. The statistical analyses were performed using SPSS 23® (IBM®, Chicago, USA). Descriptive data and Pearson product-moment correlations (r10-s measurementintervals/rpersons) are reported in Table 1. HR is significantly negatively correlated with RMSSD, and positively correlated with SCL and the LF/HF ratio; the LF/HF ratio is positively associated with SCL and SCR. The baseline of perceived stress is significantly positively associated with HR, the LF/HF ratio, and SCL. Furthermore, the baseline of perceived stress is significantly negatively associated with RMSSD and SCR (each on the basis of 10-s measurement intervals). There are also certain significant correlations between the physiological measures, personal characteristics, and problem-solving activities. In the multilevel analysis, only those variables will be considered as predictors that are significantly correlated to the physiological measures on the basis of 10-s measurement intervals. Because of the high correlations (not reported in Table  1) between sex and BMI (r = −.66, p = .003; male = 0, female = 1), age and BMI (r = .55, p = .019), and vocational experience and age (r  =  .53, p  =  .022), the variables sex and age will not be included in the multilevel analysis in order to exclude effects of multicollinearity.3 Time spent on the problem-solving task (starting time to end time, counted in 10-s time intervals) is significantly correlated with problem-solving activities including goal elaboration and definition (r =  −.11**), information seeking (r  =  −.28**), information recording (r  =  −.25**), decision making (r  =  .16**), performing actions and operations (r  =  .52**), and action control and reflection (r  =  .04*) (r10-s measurement intervals are reported). That indicates that specific activities occur earlier or later than other activities. Stress before, during, and after the task Repeated-measures ANOVAs showed significant effects of TIME (before, during, and after the task; cf. Fig.  1) for perceived stress (before  <  after; F(1, 17)  =  34.230, p < .001, η2 = .668) and SCL (before < during < after; F(1.10, 18.76) = 37.847, p < .001, η2  =  .690). No significant effects were found for HR [F(1.32, 21.18)  =  .179, p  =  .745, η2 = .011], RMSSD [F(1.42, 19.83) = 1.644, p = .219, η2 = .105], or LF/HF ratio [F(1.42, 22.73)  =  2.362, p  =  .130, η2  =  .129]. SCR average amplitudes are higher after the task compared to the SCR amplitudes before the task [F(1.30, 22.13)  =  4.136, p  =  .045, η2 = .196, Bonferroni-corrected p = .064], but after Bonferroni correction these differences just failed to reach the 5% level of significance (Table 2). 3 There were no significant effects of the BMI on physiological responses in the mixed-effects models including simul taneous estimations. However, possible effects of sex and age were controlled in separate models (not reported) and no significant effects of either variable were found. 2 5 2 ./**174 ./**088 ./**72− ./**62− ./**279 ./**64− ./022 ../100− ./332 ../3100 ./191 ../102− ./**098 ./316− ../204− ./701 ‑ltsae10d  i(eadnm=:rrteod m on ] itse (D it 3 ) iv S la ] .9 1 ] it S re .;,...[851914067016−± ,..;.[406451813035−± ..;,..[]62133221−± .;,...[]1117281036−± ;..,.][3225216−± ,llf)((aaeee210mm== ,;..[]2436703973± ,.;...[07189528724826± ,;..[]2607291479± ;,..[]8031350± ;,.[]86130318312± ;..,..][7535723304± .;,.][8710845± .,;...[]659204932383± ;.,..][100845266± .;,.][0310829± .;,.][39205101± ;..,..][1252817338± .;,.][730128± .;,.][6220695± ‑;illlrsscvvaaeeooungbpm .,.,    i)x18614anRMMM==‑rrrttsccaeoooounndpmm ted ,83 ; 2 − − 2 .0 6 2 2 2 3 1 3 .2 1 3 .1 .6 7 .0 .4 e P Table 2 Stress before, during, and after the task PS 27.94 19.26 – – 57.06 21.97 <.001 .668 HR 77.18 9.94 78.64 11.26 78.06 14.44 .745 .011 RMSSD 50.51 22.53 44.84 20.21 48.20 18.79 .219 .105 LF/HF ratiob 1.59 .54 1.40 .44 1.44 .53 .130 .129 SCLc 3.90 1.27 6.26 2.10 7.08 2.30 <.001 .690 SCRd .31 .17 .37 .13 .36 .13 .045 .196 15 ≤ n (persons) ≤ 18; PS = perceived stress [mm]; HR = heart rate [bpm]; RMSSD = root mean square of successive differences [ms]; SCL = skin conductance level [µS]; SCR = mean amplitudes of skin conductance responses [µS] a Greenhouse‑ Geisser‑adjusted p values; Multiple comparisons, Bonferroni‑ corrected b LF/HF (before) > LF/HF (during), p = .011 c SCL (before) < SCL (during) < SCL (after), each p < .001 d SCR (before) < SCR (after), p = .064 Multilevel analysis Null models The analysis of the null models for the physiological measures nested within participants shows significant random intercept variances for HR (σ2u  =  .501), RMSSD (σ2u  =  .799), LF/HF ratio (σ2u  =  .238), SCL (σ2u  =  .861), and SCR amplitudes (σ2u  =  .200), indicating remarkable variability between participants (Table  3). Though the current study has a relatively small sample size, random intercept variances and intraclass correlation coefficients (ICC = σ2u/[σ2u + σe2]) indicate adequate variability across the nesting units (participants) at Level 2 (cf. Heck and Thomas 2015). Mixed‑effects models Models 1, 2, 3, and 4 show non-significant effects for personal characteristics. Only the SCR (Model 5) is significantly negatively associated with the baseline of perceived stress (β = −.231, p = .032). On Level 1, the time from starting is significantly associated with HR and SCL. Problem-solving activities including goal elaboration and definition are significantly associated with changes in heart rate during the task (β  =  .108, p  <  .001) (limitations mentioned below). Problem-solving activities including decision making significantly affect changes in SCR mean amplitudes (β = .057, p = .004). When checking possible moderation effects, in Model 1 a significant interaction effect between vocational experience and problem-solving activities including goal elaboration and definition was found (β  =  −.168, p  <  .001). Figure  3 illustrates the group-specific linear growth trajectories of the two groups (classification via median split): participants below the median (0–3 years of vocational experience; n = 10) show a stronger increase in HR, with increasing values of goal elaboration and definition, than participants above the median (≥4 years of vocational experience; n = 8). Because of the significant interaction effect, the characteristics of main effects and interaction effects were checked graphically with reference to the classification of Leigh and Kinnear (1980): the rank order of levels of the factor “goal elaboration and definition” does not remain constant over all levels of the factor “vocational experience.” This H S .1 .0 .0 Fig. 3 Interaction effect: vocational experience × goal elaboration and definition describes a non-monotonic relation, and the main effect of “goal elaboration and definition” cannot be sensibly interpreted. The repeated-measures effects reveal significant auto-correlations for HR (ρ =  .619), RMSSD (ρ = .844), LF/HF (ρ = .830), and SCL (ρ = .842) (all p < .001), but not for SCR (ρ = .029, p = .348). The comparison of the information criteria (−2LL, AIC, BIC) shows that all the mixed-effects models (predictors included at Levels 1 and 2) fit better to the data than the corresponding null models (Table 4). Associations between problem‑solving performance, stress, and problem‑solving activities The problem-solving score shows a significantly negative association with the baselinecorrected and person-aggregated LF/HF ratio (r =  −.52, p  =  .028). The negative association indicates that higher physiological stress during the problem-solving task is accompanied by lower problem-solving performance (Fig. 4). There are neither significant linear nor non-linear (quadratic polynomial) associations between problem-solving performance and the other stress variables. With regard to the coded problem-solving activities, the problem-solving score correlates significantly positively with activities including “performing goal-oriented actions and operations” (r  =  .62, p  =  .006), and positively but not significantly with activities including “information seeking” (r = .17, p = .501), “forecasting and planning” (r = .23, p  =  .359), “decision making” (r  =  .22, p  =  .389), and “action control and reflection” (r  =  .07, p  =  .796). Participants who spend a lot of time on activities including “goal elaboration and definition” (r = −.31, p = .212) and “information recording” (r = −.47, p  =  .051) tend to show lower problem-solving scores (each correlation on the basis of person-aggregated values). Discussion of findings and limitations Eighteen participants were confronted with a computer-based office simulation, and they had to work on a problem from the domain of business administration. Electrodermal and cardiovascular responses were measured continuously during the task. Problem-solving behaviors were recorded via screencast and think-aloud recordings (Fig. 2). Fig. 4 Association between LF/HF ratio and problem-solving performance In this section, the empirical findings will be discussed with reference to the research questions and hypotheses. Stress‑inducing potentials of problem‑solving activities (RQ1) With reference to the first research question, hypothesis H1a can be confirmed. The comparison of the general study phases (before, during, and after the task; see Fig.  1) shows that the problem-solving task in general was associated with physiological stress reactions (SCL at p < .001; SCR at p < .1) and with perceived stress (Table 2).The mixedeffects analysis revealed that the time from starting was significantly associated with changes in HR and SCL, indicating effects of increasing time pressure during the task (Table 4). With reference to hypotheses H1b to H1h, only the effect of problem-solving activities including decision making (H1f ) conforms to the assumptions. The mixed-effects model (Model 5: SCR) reveals a significant association between the mean amplitudes of detected skin conductance responses and decision making (β  =  .057, p  =  .004; see Table 4). The participants had to make decisions under uncertainty because they did not immediately know which possible consequences their decisions would have. As existing literature shows, SCRs reflect unconscious evaluative processes that are related to the anticipation of forthcoming events (Damasio 1994; Dawson et al. 2011; Mauss and Robinson 2009). Even though changes in HR are significantly associated with problemsolving activities including goal elaboration and definition (see Model 1: HR, Table 4), the main effect found cannot be sensibly interpreted because of the significant interaction effect between participants’ vocational experience and problem-solving activities including goal elaboration and definition (cf. Leigh and Kinnear 1980). For problem-solving activities including information seeking, information recording, forecasting and planning, performing goal-oriented actions and operations, and action control and reflection, no significant effects were found. There are some possible explanations for the absent effects. When assessing participants’ problem-solving activities in the current study via codings based on screencast videos and think-aloud recordings, there is the problem that some participants told us much while other participants provided very few usable verbal data. Furthermore, the video-based analyses of problemsolving activities showed that the main activities observed were information seeking (M = 13.83 min.), information recording (M = 3.66 min.), and performing goal-oriented operations (M = 7.38 min.). This finding could mean either that some activities occurred more frequently than other activities or that some activities were just more observable than others. Therefore, in further research, the use of log file analyses seems to be worthwhile because it is expected to provide a very detailed analysis of problem-solving behaviors, heuristics, and algorithms. Furthermore, in the current study the predefinition of strictly defined event markers was not possible with the technical equipment that was used. Therefore, further research should emphasize the specification of predefined event markers within experimental studies: e.g., variations of problem-solving conditions such as decision making under uncertain vs. transparent conditions, or self-defining vs. nonself-defining goals, and variations of domain-specific contents. In that regard, a combination of field studies (to enhance external/ecological validity) and experimental studies (to enhance internal validity) seems to be worthwhile with regard to an evidence-based validation of findings regarding problem-solving situations. Besides methodological issues, the absent effects of the problem-solving activities mentioned above could also result from contentual issues. Possibly, the considered activities are not stress-inducing. Furthermore, it is also possible that some activities even have stress-reducing potentials, as they may act as coping behaviors within the problemsolving process (cf. Folkman 2008; Lazarus 1991, 1999; Wrosch et  al. 2003). However, there remain some open questions, which have to be considered in further research. Stress‑reducing potentials of personal characteristics (RQ2) The assumptions that general intelligence (H2a) and self-efficacy beliefs (H2c) have stress-reducing potentials cannot be confirmed unambiguously (aside from the finding that none of the named variables was significantly associated with changes in physiological reactivity in the multilevel analyses). On the one hand, general intelligence is significantly negatively correlated with LF/HF ratio (r  =  −.05*), and self-efficacy beliefs are significantly negatively associated with SCR (r = −.08**); both of those findings support the assumption of a stress-reducing function. On the other hand, general intelligence and self-efficacy beliefs are significantly positively correlated with HR (r  =  .19** and r  =  .16**, respectively), and both variables are significantly negatively associated with RMSSD (r = −.14** and r = −.21**). Furthermore, self-efficacy beliefs are significantly positively correlated with the LF/HF ratio (r = .15**). These findings in turn indicate a stress-inducing function. Although existing studies report positive associations between self-efficacy beliefs and physiological stress (e.g., Schwerdtfeger et  al. 2008), more research about the (possibly non-linear) relation among intelligence, self-efficacy, and physiological stress seems to be appropriate. One reason for the associations found which do not conform to the assumptions could be operationalization issues. In the current study, participants’ self-efficacy beliefs were measured as a trait variable and not as a state variable. Blair et al. (1999) used a state selfefficacy variable that was assumed to vary in intensity and change over time and be very situationally specific (e.g., “I understand the XYZ Product support job very well”; Ibid., p. 523). Also, Rausch et al. (2016) measured confidence in one’s competence as a very situationally specific state variable closely related to the perception of concrete situations within authentic office simulations. General intelligence is assumed to be a relatively stable personal disposition. Concerning vocational problem solving, Rausch (2016) found evidence that domain-general cognitive abilities (such as general intelligence) play a minor role, whereas domain-specific problem situations require domain-specific expertise and knowledge to a greater extent. Concerning the control variables, the BMI does not significantly affect physiological reactivity (see also Note 3). The baseline of perceived stress is significantly negatively associated with SCR changes (β = −.231, p = .032). This finding is against the assumption, as one would have expected a positive association between perceived stress and SCR. The negative effect found could be interpreted with reference to the complex interactions between the central nervous system together with the autonomic nervous system and the hypothalamus–pituitary–adrenal axis, all included in stress responses (Andrews et  al. 2013). Because of such complex physiological interactions, as well as assessment and methodological issues and possible mediating factors, interindividual differences, and contextual factors, associations between physiological and psychological stress responses may vary (Campbell and Ehlert 2012; Michaud et al. 2008). Concerning hypothesis H2b, the correlation analysis revealed significantly negative relations between vocational experience and HR (r  =  −.17**), LF/HF ratio (r = −.22**) and SCL (r = −.46**/−.51**), and a slight but significant positive association with RMSSD (r = .04*) (Table 1), indicating stress-reducing potentials of expertise in domain-specific problem solving. The main effects of vocational experience do not remain significant in the multilevel analysis. However, a significant interaction effect between vocational experience and problem-solving activities including goal elaboration and definition was found. With regard to the existing literature, the stress-buffering effect of domain-specific expertise can be interpreted as follows. Experts (compared to novices) may have acquired arousal-coping strategies which are linked through repeated exposure to problem-solving practice. Such strategies enable them to minimize stress in arousal-provoking situations due to high degrees of automaticity in action-regulation processes (Nitsch 1982; Tenenbaum et al. 2008). Participants with less or even no vocational experience (cf. the under-median group, 0–3 years) may have perceived the start of the problem-solving task as uncertain or anxiety-provoking because of the low degree of transparency and the lack of perceived control (cf. Dörner and Wearing 1995; Reither and Stäudel 1985; Schwarz and Bless 1991). Participants with more vocational experience (cf. the above-median group, ≥4 years) have by this point acquired adequate coping strategies and may consider successful problem solving realistic (cf. Lazarus 1991, 1999; Tenenbaum et al. 2008). Taking into consideration that the HR indicator primarily reflects attentional aspects of information processing demands (Kohlisch and Schaefer 1996), the stronger increase in HR with increasing degrees of activities including goal elaboration and definition could be interpreted as follows: the “novices” have to concentrate their attention on goal elaboration to a greater extent than the “experts” (who already have developed routines) may have to do. Taking into account that individuals’ states (such as physiological reactivity to demanding situations) are affected not only by situational conditions but also by personal characteristics (cf. Kärner and Kögler 2016; Kärner et al. 2017), the interaction effect found between vocational experience and goal elaboration provides evidence for person-situation interactions, also within narrowly defined vocational problem-solving situations. The absent fixed effects for the personal characteristics could also be attributable to methodological/statistical issues because of the small sample size at the second level and its possible effects on the accuracy of the estimation. A number of references emphasize that the restricted-maximum-likelihood method for estimation of regression weights works well in small sample settings, and there are a number of exemplary multilevel applications that refer to small sample sizes at Level 2 (N = 15–20) (e.g., Kenward and Roger 1997; McNeish and Stapleton 2016; Skene and Kenward 2010; Stegmueller 2013). However, the current study contains a relatively small sample size (N = 18; participants at Level 2) in relation to a large sample of repeated measurements nested within persons (the medians of frequencies of 10-s measurement intervals range from 101 to 184 measures per person; Level 1). Snijders (2005) states that the statistical power in multilevel modeling depends primarily on the total sample sizes for each level and that the sample size at the highest level (in the current analysis the second level) is the main limiting characteristic of the statistical design. Also, Scherbaum and Ferreter (2009, p. 352) note, “as a general rule of thumb, increasing the sample size at the highest level (i.e., sampling more groups) will do more to increase power than increasing the number of individuals in the groups.” Maas and Hox (2005) found that a small sample size at Level 2 (≤50) leads to biased estimates of the second-level standard errors and parameters. Stress and problem‑solving performance (RQ3) Concerning the assumed relation between stress and problem-solving performance, hypothesis H3 can be confirmed for the significantly negative association between the LF/HF ratio and the problem-solving score. In that regard, existing research shows that stress affects performance by the impairment of memory retrieval and by cognitive interference (cf. Eysenck et  al. 2007; Vogel and Schwabe 2016). However, the existing literature also provides evidence for non-linear relationships between stress and performance. With reference to the findings of Yerkes and Dodson (1908) and Hebb (1955), it has to be taken into account that the relation between performance and stress can be described as an inverted U-shaped curve. Both overly low and overly high degrees of activation may lead to low degrees of performance. The optimum of performance is reached at a moderate level of activation (Frankenhaeuser and Lundberg 1977). In the current study no significant non-linear (quadratic polynomial) relations between problem-solving performance and the stress variables were found. However, it seems to be worthwhile to consider non-linear relations as well as interindividual differences in performance-activation relationships to a greater extent in further research (cf. VaezMousavi et al. 2009). Study design The study design which was used has both advantages and limitations. The computerbased office simulation offers an authentic test format that has ecological validity (cf. Rausch et al. 2016; Seifried et al. 2016) and that can be used as stimulus material under controlled and standardized conditions. However, the problem scenario covers only a part of the wide range of tasks in the business administration domain, and so further studies should look at other problem topics and domains. A possible reason for the absent main effects of personal characteristics could also be attributable to the study design. Maybe the participants were not seriously stressed in the laboratory context, as compared to a real-life-situation at the workplace. I found that participants reported above-average values of perceived stress after the problem-solving task (M = 57.06, SD = 21.97; within a possible range from 0 to 100; see Table 2). However, the relatively high standard deviation indicates that some participants were more stressed than others. Furthermore, the relatively small changes in the physiological values in response to the task indicate that working on the problem indeed affected the autonomic nervous system, but that it did not massively stress them as real-life problemsolving situations at the workplace might. Therefore, additional investigation of everyday business problem-solving activities in naturalistic field contexts will be necessary to increase the internal validity of research results. The study aimed to investigate stress responses to problem-solving activities in a domain-specific context. Thus, the stress responses should be primarily attributed to the internal structure of the task (cf. intrinsic cognitive load, Sweller 1988) and not to problems with the handling of the computer-based office simulation (cf. extraneous cognitive load, Ibid.). To control for possible effects of presentational characteristics, problems regarding copy-and-paste functions, spreadsheet application use, open files, and software hanging problems were also coded. In that regard, no significant correlations between “handling software problems” and the stress measures were found (Table 1). Conclusions and further research The reported methodological approach is not new in its form. In previous empirical research in VET, comparable physiological methods (e.g., Abele et  al. 2017; Beck and Sczesny 1993; Kärner et  al. 2017; Santjer-Schnabel 2002) and systematic observations of in-depth action processes related to problem-solving tasks (e.g., Bley et  al. 2015) have already been applied. Moreover, theoretical and conceptual frameworks have already been developed (e.g., Beck 1994; Sembill 1992 et passim). Sembill (2015a), for instance, discusses a theoretical conceptual approach that integrates different levels of analysis—from the “Nano-level” (e.g., neurophysiological states and processes) to the “Macro-level” (e.g., socio-economic circumstances). Sembill’s approach assumes balancing processes and evaluation processes as pivotal characteristics at each level. However, research to date has lacked systematic efforts to integrate physiological methods into VET research practice. Besides the reported responses of the autonomic nervous system, in further research, the application, for example, of functional neuroimaging methods such as functional magnetic resonance imaging, positron emission tomography, and electroencephalography, or even eye-tracking technology, would seem to be worthwhile to investigate controlled (explicit, conscious) and automatic (implicit, unconscious) processes in the course of domain-specific actions. An essential advantage of physiological methods can be located in the objectivity of measurement that is relatively independent from self-reporting biases (cf. Dawson et  al. 2011). That seems to be important, especially when investigating implicit aspects of action processes that cannot be directly verbalized by the individual. However, one has to consider that physiological measures are not meaningful per se in the VET context but have to be interpreted in their interplay with psychological parameters (e.g., traits, experiences, behaviors) or with particular Due to the more explorative character of the study and because of the relatively small sample size  at Level 2, the empirical findings are only specific for the sample and cannot be generalized. However, the mixed-methods study could make a contribution to further research practice in VET as the study design combines (1) high-frequency measurements of physiological data, (2) in-depth video-based observation of problem-solving activities within an authentic test format that has ecological validity, and (3) assessment of personal characteristics. Abbreviations AIC: Akaike information criterion; ANOVA: analysis of variance; ANS: autonomic nervous system; BIC: Bayesian information criterion; BMI: body mass index; H: hypothesis; HF: high-frequency domain; HR: heart rate; HRV: heart rate variability; Hz: hertz; ICC: intraclass correlation coefficient; LF: low-frequency domain; −2LL: −2log-likelihood; mm: millimeter; PS: perceived stress; RMSSD: root mean square of successive differences; RQ: research question; SCL: skin conductance level; SCR: skin conductance response; sec., s: seconds; VET: vocational education and training; µS: microsiemens. Acknowledgements The author would like to thank (1) M.Sc. Matthias Kerrmann who supported the study within the scope of his master’s thesis (supervised by T. Kärner), (2) Dr.-Ing. Stefan Hey (Karlsruhe Institute of Technology, Germany; movisens GmbH, Karlsruhe, Germany) who provided the measurement devices for the measurement of electrodermal activity, and (3) the anonymous reviewers for their comments and suggestions that help to improve the paper. Availability of data and materials The data will not be shared publicly because for data protection reasons. Consent for publication All participants provided written, informed consent for publication. Publisher’s Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations. Abele S , Ostertag R , Peissner M , Schuller A ( 2017 ) Eine Eye-Tracking-Studie zum diagnostischen Problemlöseprozess: Bedeutung der Informationsrepräsentation für den diagnostischen Problemlöseerfolg (An eye tracking study on the problem-solving process in professional contexts: relevance of “representing information” for the diagnostic problem-solving success] . ZBW 113 ( 1 ): 86 - 109 Achtenhagen F , Winther E ( 2009 ) Konstruktvalidität von Simulationsaufgaben: Computergestützte Messung berufsfachlicher Kompetenz-am Beispiel der Ausbildung von Industriekaufleuten. Bericht an das Bundesministerium für Bildung und Forschung (K350600) . https://www.bmbf.de/files/Endbericht_BMBF09.pdf. Accessed 2 June 2016 Andrews J , Ali N , Pruessner JC ( 2013 ) Reflections on the interaction of psychogenic stress systems in humans: the stress coherence/compensation model . Psychoneuroendocrinology 38 ( 7 ): 947 - 961 . doi:10.1016/j.psyneuen. 2013 .02.010 Baert S , Casier A , De Raedt R ( 2012 ) The effects of attentional training on physiological stress recovery after induced social threat . Anxiety Stress Coping 25 ( 4 ): 365 - 379 . doi:10.1080/10615806.2011.605122 Bandura A ( 1994 ) Self-efficacy . In: Ramachaudran VS (ed) Encyclopedia of human behavior . Academic Press, New York, pp 71 - 81 Bandura A , Reese L , Adams NE ( 1982 ) Microanalysis of action and fear arousal as a function of differential levels of perceived self-efficacy . J Personal Soc Psychol 43 ( 1 ): 5 - 21 . doi:10.1037/ 0022 - 3514 .43.1.5 Bandura A , Cioffi D , Taylor CB , Brouillard ME ( 1988 ) Perceived self-efficacy in coping with cognitive stressors and opioid activation . J Personal Soc Psychol 55 ( 3 ): 479 - 488 Bechara A , Damasio H , Tranel D , Damasio AR ( 1997 ) Deciding advantageously before knowing the advantageous strategy . Science 275 ( 5304 ): 1293 - 1295 . doi:10.1126/science.275.5304.1293 Beck K ( 1994 ) Das Leib-Seele-Problem und die Erziehungswissenschaft. Ein Orientierungsversuch . In: Pollack G, Heid H (eds) Von der Erziehungswissenschaft zur Pädagogik? . Deutscher Studien-Verlag, Weinheim, pp 227 - 267 Beck K , Sczesny C ( 1993 ) Zur Psychophysiologie des Lernens in der Computerinteraktion . Grundprobleme, Forschungsresultate, Untersuchungsperspektiven. Bericht zum Forschungsprojekt “Prozeßanalyse computergestützen Lernens” . Universität Erlangen-Nürnberg, Nürnberg Blair DV , O'Neil HF Jr, Price DJ ( 1999 ) Effects of expertise on state self-efficacy and state worry during a computer-based certification test . Comput Hum Behav 15 ( 3-4 ): 511 - 553 . doi:10.1016/S0747-5632(99)00034- 5 Bley S , Wiethe-Körprich M , Weber S ( 2015 ) Formen kognitiver Belastung bei der Bewältigung technologiebasierter authentischer Testaufgaben-eine Validierungsstudie zur Abbildung von beruflicher Kompetenz . ZBW 111 ( 2 ): 268 - 294 Blitz PS , Hoogstraten J , Mulder G ( 1970 ) Mental load, heart rate and heart rate variability . Psychol Res 33 ( 4 ): 277 - 288 . doi:10.1007/BF00424555 Botvinick MM , Rosen ZB ( 2009 ) Anticipation of cognitive demand during decision-making . Psychol Res 73 ( 6 ): 835 - 842 . doi:10.1007/s00426- 008 - 0197 -8 Braithwaite JJ , Watson DG , Jones R , Rowe M ( 2013 ) A guide for analysing electrodermal activity (EDA) & skin conductance responses (SCRs) for psychological experiments . Technical report: Selective Attention & Awareness Laboratory (SAAL) Behavioural Brain Sciences Centre , University of Birmingham, UK. http://www.biopac. com/wp-content/ uploads/EDA-SCR-Analysis .pdf. Accessed 23 Jan 2017 Brand-Gruwel S , Wopereis I , Walraven A ( 2009 ) A descriptive model of information problem solving while using internet . Comput Educ 53 ( 4 ): 1207 - 1217 . doi:10.1016/j.compedu. 2009 .06.004 Bransford J , Stein B ( 1993 ) The ideal problem solver. A guide for improving thinking, learning, and creativity . Freeman, New York Cacioppo JT , Berntson GG , Crites SL ( 1996 ) Social neuroscience: principles of psychophysiological arousal and response . In: Higgins ET , Kruglanski AW (eds) Social psychology: handbook of basic principles . Guilford Press, New York, pp 72 - 101 Campbell J , Ehlert U ( 2012 ) Acute psychosocial stress: does the emotional stress response correspond with physiological responses ? Psychoneuroendocrinology 37 ( 8 ): 1111 - 1134 . doi:10.1016/j.psyneuen. 2011 .12.010 Cederblad M , Dahlin L , Hagnell O , Hansson K ( 1995 ) Intelligence and temperament as protective factors for mental health. A cross-sectional and prospective epidemiological study . Arch Psychiatry Clin Neurosci 245 ( 1 ): 11 - 19 . doi:10.1007/BF02191539 Chandola T , Heraclides A , Kumari M ( 2010 ) Psychophysiological biomarkers of workplace stressors . Neurosci Biobehav Rev 35 ( 1 ): 51 - 57 . doi:10.1016/j.neubiorev. 2009 .11.005 Clays E , De Bacquer D , Crasset V , Kittel F , De Smet P , Kornitzer M , Karasek R , De Backer G ( 2011 ) The perception of work stressors is related to reduced parasympathetic activity . Int Arch Occup Environ Health 84 ( 2 ): 185 - 191 . doi:10.1007/s00420- 010 - 0537 -z Conroy DE , Willow JP , Metzler JN ( 2002 ) Multidimensional fear of failure measurement: the performance failure appraisal inventory . J Appl Sport Psychol 14 ( 2 ): 76 - 79 . doi:10.1080/10413200252907752 Cornelisse S , Van Stegeren AH , Joëls M ( 2011 ) Implications of psychosocial stress on memory formation in a typical male versus female student sample . Psychoneuroendocrinology 36 ( 4 ): 569 - 578 . doi:10.1016/j.psyneuen. 2010 .09.002 Damasio AR ( 1994 ) Descartes' error: emotion, reason and the human brain . AVON BOOKS , New York Dawson ME , Schell AM , Courtney CG ( 2011 ) The skin conductance response, anticipation, and decision-making . J Neurosci Psychol Econ 4 ( 2 ): 111 - 116 . doi:10.1037/a0022619 Deffenbacher JL ( 1978 ) Worry, emotionality, and task-generated interference in test anxiety: an empirical test of attentional theory . J Educ Psychol 70 ( 2 ): 248 - 254 . doi:10.1037/ 0022 - 0663 .70.2. 248 Doberenz S , Roth WT , Maslowski NI , Wollburg E , Kim S ( 2011 ) Methodological considerations in ambulatory skin conductance monitoring . Int J Psychophysiol 80 ( 2 ): 87 - 95 . doi:10.1016/j.ijpsycho. 2011 .02.002 Dörner D ( 1976 ) Problemlösen als Informationsverarbeitung [Problem solving as information processing] . Kohlhammer, Stuttgart Dörner D ( 1996 ) The logic of failure: recognizing and avoiding error in complex situations . Perseus, New York Dörner D , Pfeifer E ( 1992 ) Strategisches Denken, strategische Fehler, Streß und Intelligenz [Strategic thinking, strategic errors , stress, and intelligence]. Sprache & Kognition 11 ( 2 ): 75 - 90 Dörner D , Wearing AJ ( 1995 ) Complex problem solving: toward a (computersimulated) theory . In: Frensch PA, Funke J (eds) Complex problem solving . Erlbaum, Hillsdale , pp 65 - 99 Ebstrup JF , Eplov LF , Pisinger C , Jørgensen T ( 2011 ) Association between the five factor personality traits and perceived stress: is the effect mediated by general self-efficacy? Anxiety Stress Coping 24 ( 4 ): 407 - 419 . doi:10.1080/10615 806. 2010 .540012 Eppler MJ , Mengis J ( 2004 ) The concept of information overload-a review of literature from organization science , accounting, marketing, MIS, and related disciplines. Inf Soc 20 ( 5 ): 1 - 2 . doi:10.1007/978- 3 - 8349 - 9772 -2_ 15 Eysenck MW , Derakshan N , Santos R , Calvo MG ( 2007 ) Anxiety and cognitive performance: attentional control theory . Emotion 7 ( 2 ): 336 - 353 . doi:10.1037/ 1528 - 3542 .7.2. 336 Fischer A , Greiff S , Funke J ( 2012 ) The process of solving complex problems . JPS 4 ( 1 ): 19 - 42 . doi:10.7771/ 1932 - 6246 . 1118 Folkman S ( 2008 ) The case for positive emotions in the stress process . Anxiety Stress Coping 21 ( 1 ): 3 - 14 . doi:10.1080/10615800701740457 Folkman S , Lazarus RS , Dunkel-Schetter C , DeLongis A , Gruen RJ ( 1986a ) Dynamics of a stressful encounter: cognitive appraisal, coping, and encounter outcomes . J Personal Soc Psychol 50 ( 5 ): 992 - 1003 Folkman S , Lazarus RS , Gruen RJ , DeLongis A (1986b) Appraisal, coping, health status, and psychological symptoms . J Personal Soc Psychol 50 ( 3 ): 571 - 579 Frankenhaeuser M , Lundberg U ( 1977 ) The influence of cognitive set on performance and arousal under different noise loads . Motiv Emot 1 ( 2 ): 139 - 149 . doi:10.1007/BF00998516 Funke J ( 1991 ) Solving complex problems: exploration and control of complex systems . In: Sternberg RJ, Frensch PA (eds) Complex problem solving: principles and mechanisms . Erlbaum, Hillsdale, pp 185 - 222 Funke J ( 2012 ) Complex problem solving . In: Seel NM (ed) Encyclopedia of the sciences of learning . Springer, New York , pp 682 - 685 Gollwitzer PM , Wicklund RA ( 1985 ) The pursuit of self-defining goals . In: Kuhl J , Beckmann J (eds) Action control: from cognition to behavior . Springer, Heidelberg, pp 61 - 85 Goode N , Beckmann J ( 2010 ) You need to know: there is a causal relationship between structural knowledge and control performance in complex problem solving tasks . Intelligence 38 ( 3 ): 345 - 352 . doi:10.1016/j.intell. 2010 .01.001 Gottfredson LS ( 1997a ) Mainstream science on intelligence: an editorial with 52 signatories, history and bibliography . Intelligence 24 ( 1 ): 13 - 23 . doi:10.1016/S0160-2896(97)90011- 8 Gottfredson LS ( 1997b ) Why g matters: the complexity of everyday life . Intelligence 24 ( 1 ): 79 - 132 . doi:10.1016/ S0160-2896(97)90014- 3 Haerem T , Rau D ( 2007 ) The influence of degree of expertise and objective task complexity on perceived task complexity and performance . J Appl Psychol 92 ( 5 ): 1320 - 1331 . doi:10.1037/ 0021 - 9010 .92.5. 1320 Hahn VC , Binnewies C , Sonnentag S , Mojza EJ ( 2011 ) Learning how to recover from job stress: effects of a recovery training program on recovery, recovery-related self-efficacy, and well-being . J Occup Health Psychol 16 ( 2 ): 202 - 216 . doi:10.1037/a0022169 Hebb DO ( 1955 ) Drives and the C .N. S (conceptual nervous system ). Psychol Rev 62 ( 4 ): 243 - 254 . doi:10.1037/h0041823 Heck RH , Thomas SL ( 2015 ) An introduction to multilevel modeling techniques . MLM and SEM approaches using Mplus . Routledge, New York Heck RH , Thomas SL , Tabata LN ( 2010 ) Multilevel and longitudinal modeling with IBM SPSS . Routledge, New York Heller KA , Hany EA , Perleth C , Sierwald W ( 2010 ) The Munich longitudinal study of giftedness . In: Heller KA, Ziegler A (eds) Munich studies of giftedness . Lit, Berlin, pp 13 - 40 Hjortskov N , Rissén D , Blangsted AK , Fallentin N , Lundberg U , Søgaard K ( 2004 ) The effect of mental stress on heart rate variability and blood pressure during computer work . Eur J Appl Physiol 92 ( 1-2 ): 84 - 89 . doi:10.1007/ s00421- 004 - 1055 -z Hox J ( 2002 ) Multilevel analysis . techniques and applications . Erlbaum, London Isowa T , Ohira H , Murashima S ( 2006 ) Immune, endocrine and cardiovascular responses to controllable and uncontrollable acute stress . Biol Psychol 71 ( 2 ): 202 - 213 . doi:10.1016/j.biopsycho. 2005 .04.002 Kärner T , Kögler K ( 2016 ) Emotional states during learning situations and students' self-regulation: process-oriented analysis of person-situation interactions in the vocational classroom . Empir Res Vocat Educ Train 8 : 12 . doi:10.1186/ s40461- 016 - 0038 -8 Kärner T , Sembill D , Aßmann C , Friederichs E , Carstensen CH ( 2017 ) Analysis of person-situation interactions in educational settings via cross-classified multilevel longitudinal modelling: illustrated with the example of students' stress experience . FLR 5 ( 1 ): 16 - 42 . doi:10.14786/flr.v5i1.137 Kemeny ME ( 2003 ) The psychobiology of stress . Curr Dir Psychol 12 ( 4 ): 124 - 129 . doi:10.1111/ 1467 - 8721 . 01246 Kenward MG , Roger JH ( 1997 ) Small sample inference for fixed effects from restricted maximum likelihood . Biometrics 53 ( 3 ): 983 - 997 . doi:10.2307/2533558 Kohlisch O , Schaefer F ( 1996 ) Physiological changes during computer tasks: responses to mental load or to motor demands ? Ergonomics 39 ( 2 ): 213 - 224 . doi:10.1080/00140139608964452 Kreibig SD ( 2010 ) Autonomic nervous system activity in emotion: a review . Biol Psychol 84 ( 3 ): 394 - 421 . doi:10.1016/j. biopsycho. 2010 .03.010 Larsen JT , Berntson GG , Poehlmann KM , Ito TA , Cacioppo JT ( 2008 ) The psychophysiology of emotion . In: Lewis M, Haviland-Jones JM , Feldman Barrett L (eds) Handbook of emotions . Guildford Press, New York, pp 180 - 195 Lazarus RS ( 1991 ) Emotion and adaptation . Oxford University Press, Oxford Lazarus RS ( 1999 ) Stress and emotion: a new synthesis . Springer, New York Lazarus RS , Speisman JC , Mordkoff AM ( 1963 ) The relationship between autonomic indicators of psychological stress: heart rate and skin conductance . Psychosom Med 25 ( 1 ): 19 - 30 . doi:10.1097/ 00006842 - 196301000 - 00004 Leigh JH , Kinnear TC ( 1980 ) On interaction classification . Educ Psychol Meas 40 ( 4 ): 841 - 843 . doi:10.1177/001316448004000405 Leutner D , Funke J , Klieme E , Wirth J ( 2005 ) Problemlösekompetenz als fächerübergreifende Kompetenz [Problem solving competence as cross-curricular competence] . In: Klieme E, Leutner D , Wirth J (eds) Problemlösekompetenz von Schülerinnen und Schülern. Diagnostische Ansätze, theoretische Grundlagen und empirische Befunde der deutschen PISA-2000-Studie [Students' problem solving competence . Diagnostic approaches, theoretical foundations and empirical results of the German PISA study 2000] . VS Verlag, Wiesbaden, pp 11 - 19 Littell RC , Pendergast J , Natarajan R ( 2000 ) Tutorial in biostatistics: modelling covariance structure in the analysis of repeated measures data . Stat Med 19 ( 13 ): 1793 - 1819 . doi:10.1002/ 1097 -0258(20000715) 19:13<1793:AID-SIM482>3.0 .CO; 2 - Q Luria RE ( 1975 ) The validity and reliability of the visual analogue mood scale . J Psychiatr Res 12 ( 1 ): 51 - 57 . doi:10.1016/ 0022 -39 5 Maas CJM , Hox JJ ( 2005 ) Sufficient sample sizes for multilevel modeling . Methodology 1 ( 3 ): 86 - 92 . doi:10.1027/ 1614 - 1881 .1.3. 86 Malik M , Bigger JT , Camm AJ , Kleiger RE , Mallian A , Moss AJ , Schwartz PJ , Task Force of The European Society of Cardiology and The North American Society of Pacing and Electrophysiology ( 1996 ) Heart rate variability: Standards of measurement, physiological interpretation, and clinical use . Eur Heart J 17 ( 3 ): 354 - 381 Mauss IB , Robinson MD ( 2009 ) Measures of emotion: a review . Cogn Emot 23 ( 2 ): 209 - 237 . doi:10.1080/02699930802204677 Mayer RE ( 1994 ) Problem solving . In: Eysenck MW (ed) The Blackwell dictionary of cognitive psychology . Blackwell, Oxford, pp 284 - 288 Mayer RE , Wittrock MC ( 2006 ) Problem solving . In: Alexander PA, Winne PH (eds) Handbook of educational psychology . Routledge , New York, pp 287 - 303 McNeish DM , Stapleton LM ( 2016 ) The effect of small sample size on two-level model estimates: a review and illustration . Educ Psychol Rev 28 ( 2 ): 295 - 314 . doi:10.1007/s10648- 014 - 9287 -x Michaud K , Matheson K , Kelly O , Anisman H ( 2008 ) Impact of stressors in a natural context on release of cortisol in healthy adult humans: a meta-analysis . Stress 11 ( 3 ): 177 - 197 . doi:10.1080/1025389070172787 movisens (2015) DataAnalyzer. Analysis of physiologic measurement data . User Manual , DataAnalyzer 1. 7 , movisens GmbH , Karlsruhe Newell A , Simon HA ( 1972 ) Human problem solving . Prentice-Hall, Englewood Cliffs Nickolaus R , Abele S , Gschwendtner T , Nitzschke A , Greiff S ( 2012 ) Fachspezifische Problemlösefähigkeit in gewerblichtechnischen Ausbildungsberufen-Modellierung, erreichte Niveaus und relevante Einflussfaktoren . ZBW 108 ( 2 ): 243 - 272 Nitsch JR ( 1982 ) Handlungspsychologische Ansätze im Sport . In: Thomas A (ed) Sportpsychologie. Ein Handbuch in Schlüsselbegriffen. Urban and Schwarzenberg , München, pp 26 - 41 Rausch A ( 2016 ) Dispositional predictors of problem solving in the field of office work . Vocat Learn . doi:10.1007/ s12186- 016 - 9165 -4 Rausch A , Wuttke E ( 2016 ) Development of a multi-faceted model of domain-specific problem-solving competence and its acceptance by different stakeholders in the business domain . Unterrichtswissenschaft 44 ( 2 ): 164 - 189 Rausch A , Schley T , Warwas J ( 2015 ) Problem solving in everyday office work-a diary study on differences between experts and novices . Int J Lifelong Educ 34 ( 4 ): 448 - 467 . doi:10.1080/0260137.2015.1060023 Rausch A , Seifried J , Wuttke E , Kögler K , Brandt S ( 2016 ) Reliability and validity of a computer-based assessment of cognitive and non-cognitive facets of problem-solving competence in the business domain . Empir Res Vocat Educ Train 8 : 1 - 23 . doi:10.1186/s40461- 016 - 0035 -y Reinhardt T , Schmahl C , Wüst S , Bohus M ( 2012 ) Salivary cortisol, heart rate, electrodermal activity and subjective stress responses to the Mannheim Multicomponent Stress Test (MMST) . Psychiatry Res 198 ( 1 ): 106 - 111 . doi:10.1016/j. psychres. 2011 .12.009 Reither F , Stäudel T ( 1985 ) Thinking and action . In: Frese M, Sabini J (eds) Goal directed behavior: the concept of action in psychology . Erlbaum, Hillsdale, pp 110 - 122 Rimmele R ( 2013 ) Das Programm Videograph [the software videograph] . http://www.ipn.uni-kiel.de/aktuell/videograph/ htmStart.htm. Accessed 1 Jun 2013 Roberts AD , Wessely S , Chalder T , Papadopoulos A , Cleare AJ ( 2004 ) Salivary cortisol response to awakening in chronic fatigue syndrome . Br J Psychiatry 184 ( 2 ): 136 - 141 . doi:10.1192/bjp.184.2. 136 Santjer-Schnabel I ( 2002 ) Emotionale Befindlichkeit in einer selbstorganisationsoffenen Lernumgebung . Überlegungen für die ergänzende Berücksichtigung physiologischer Aspekte . Dr. Kovač, Hamburg Sanz A , Villamarin F ( 2001 ) The role of perceived control in physiological reactivity: self-efficacy and incentive value as regulators of cardiovascular adjustment . Biol Psychol 56 ( 3 ): 219 - 246 . doi:10.1016/S0301-0511(01)00095- 3 Scherbaum CA , Ferreter JM ( 2009 ) Estimating statistical power and required sample sizes for organizational research using multilevel modeling . Organ Res Methods 12 ( 2 ): 347 - 367 . doi:10.1177/1094428107308906 Schneider SC ( 1987 ) Information overload: causes and consequences . HSM 7 ( 2 ): 143 - 153 . doi:10.3233/ HSM-1987-7207 Schwarz N , Bless B ( 1991 ) Happy and mindless, but sad and smart? The impact of affective states on analytic reasoning . In: Forgas J (ed) Emotion and social judgment . Pergamon , London, pp 55 - 72 Schwarzer R , Jerusalem M (eds) ( 1999 ) Skalen zur Erfassung von Lehrer- und Schülermerkmalen . Dokumentation der psychometrischen Verfahren im Rahmen der Wissenschaftlichen Begleitung des Modellversuchs Selbstwirksame Schulen: Allgemeine Selbstwirksamkeitserwartung , pp 13 - 14 . http://www.psyc.de/skalendoku.pdf. Accessed 15 Mar 2016 Schwerdtfeger A , Konermann L , Schönhofen K ( 2008 ) Self-efficacy as a health-protective resource in teachers? A biopsychological approach . Health Psychol 27 ( 3 ): 358 - 368 . doi:10.1037/ 0278 - 6133 .27.3. 358 Seifried J , Rausch A , Kögler K , Brandt S , Eigenmann R , Schley T , Siegfried C , Egloffstein M , Küster J , Wuttke E , Sembill D , Martens T , Wolf KD ( 2016 ) Problemlösekompetenz angehender Industriekaufleute-Konzeption des Messinstruments und ausgewählte empirische Befunde (DomPL-IK) . In: Beck K, Landenberger M , Oser F (eds) Technologiebasierte Kompetenzmessung in der beruflichen Bildung . Ergebnisse aus der BMBF-Förderinitiative ASCOT [Technology-based measurement of competencies in vocational education and training. Findings of the BMBF funding initiative ASCOT] . Bertelsmann , Bielefeld, pp 119 - 138 Selye H ( 1973 ) The evolution of the stress concept . The originator of the concept traces its development from the discovery in 1936 of the alarm reaction to modern therapeutic applications of syntoxic and catatoxic hormones . Am Sci 61 ( 6 ): 692 - 699 Sembill D ( 1992 ) Problemlösefähigkeit, Handlungskompetenz und Emotionale Befindlichkeit. Zielgrößen Forschenden Lernens [Problem-solving abilities, action competence, and emotional states. Target dimensions of inquiry-based learning] . Hogrefe, Göttingen Sembill D (ed) (2015a) Blick zurück in die Zukunft-Aufbaujahre der Wirtschaftspädagogik in Bamberg (1999-2015) . Bamberger Betriebswirtschaftliche Beiträge Nr. 215 Sembill D , Rausch A , Kögler K ( 2013 ) Non-cognitive facets of competence-theoretical foundations and implications for measurement . In: Beck K, Zlatkin-Troitschanskaia O (eds) From diagnostics to learning success: proceedings in vocational education and training . Sense, Rotterdam, pp 199 - 212 Skene SS , Kenward MG ( 2010 ) The analysis of very small samples of repeated measurements II: a modified Box correction . Stat Med 27 ( 27 ): 2838 - 2856 . doi:10.1002/sim.4072 Sleight P , Bernardi L ( 1998 ) Sympathovagal Balance . Circulation 98 ( 23 ): 2640 . doi:10.1161/01.CIR.98.23.2640 Smeets T ( 2011 ) Acute stress impairs memory retrieval independent of time of day . Psychoneuroendocrinology 36 ( 4 ): 495 - 501 . doi:10.1016/j.psyneuen. 2010 .08.001 Snijders TAB ( 2005 ) Power and sample size in multilevel linear models . In: Everitt BS, Howell DC (eds) Encyclopedia of Statistics in behavioral science , vol 3. Wiley, Chicester, pp 1570 - 1573 Starcke K , Brand M ( 2012 ) Decision making under stress: a selective review . Neurosci Biobehav Rev 36 ( 4 ): 1228 - 1248 . doi:10.1016/j.neubiorev. 2012 .02.003 Stegmueller D ( 2013 ) How many countries for multilevel modeling? A comparison of frequentist and bayesian approaches . Am J Polit Sci 57 ( 3 ): 748 - 761 . doi:10.1111/ajps.12001 Steptoe A , Wardle J ( 2005 ) Cardiovascular stress responsivity, body mass and abdominal adiposity . Int J Obes 29 ( 11 ): 1329 - 1337 . doi:10.1038/sj.ijo. 0803011 Steptoe A , Fieldman G , Evans O , Perry L ( 1996 ) Cardiovascular risk and responsivity to mental stress: the influence of age, gender and risk factors . J Cardiovasc Risk 3 ( 1 ): 83 - 93 . doi:10.1177/174182679600300112 Sternberg RJ ( 1998 ) Applying the triarchic theory of human intelligence in the classroom . In: Sternberg RJ , Williams WM (eds) Intelligence, instruction, and assessment: theory into practice . Erlbaum, Mahwah , pp 1 - 15 Sweller J ( 1988 ) Cognitive load during problem solving: effects on learning . Cognit Sci 12 ( 2 ): 257 - 285 . doi:10.1207/ s15516709cog1202_4 Sweller J , Ayres P , Kalyuga S ( 2011 ) Cognitive load theory . Springer, New York Taelman J , Vandeput S , Vlemincx E , Spaepen A , Van Huffel S ( 2011 ) Instantaneous changes in heart rate regulation due to mental load in simulated office work . Eur J Appl Physiol 111 ( 7 ): 1497 - 1505 . doi:10.1007/s00421- 010 - 1776 -0 Tenenbaum G , Edmonds WA , Eccles DW ( 2008 ) Emotions, coping strategies, and performance: a conceptual framework for defining affect-related performance zones . Mil Psychol 20 ( 1 ): 11 - 37 . doi:10.1080/08995600701804772 Thayer JF , Åhs F , Fredrikson M , Sollers JJ 3rd, Wager TD ( 2012 ) A meta-analysis of heart rate variability and neuroimaging studies: implications for heart rate variability as a marker of stress and health . Neurosci Biobehav Rev 36 ( 2 ): 747 - 756 . doi:10.1016/j.neubiorev. 2011 .11.009 VaezMousavi SM , Barry RJ , Clarke AR ( 2009 ) Individual differences in task-related activation and performance . Physiol Behav 98 ( 3 ): 326 - 330 . doi:10.1016/j.physbeh. 2009 .06.007 Vogel S , Schwabe L ( 2016 ) Learning and memory under stress: implications for the classroom . npj Sci Learn 1 : 16011 . doi:10.1038/npjscilearn.2016.11 Weinert FE ( 2001 ) Concept of competence: a conceptual clarification . In: Rychen DS, Salganik LH (eds) Defining and selecting key competencies . Hogrefe and Huber , Seattle, pp 45 - 65 Weiß RH ( 2006 ) CFT 20-R mit WS/ZF-R. Grundintelligenztest Skala 2-Revision (CFT 20-R) mit Wortschatztest und Zahlenfolgentest-Revision (WS/ZF-R) . Hogrefe, Göttingen Werner EE ( 2000 ) Protective factors and individual resilience . In: Shonkoff JP, Meisels SJ (eds) Handbook of early childhood intervention . Cambridge University Press, Cambridge, pp 115 - 132 Winsky-Sommerer R , Boutrel B , De Lecea L ( 2005 ) Stress and arousal. The corticotrophin-releasing factor/hypocretin circuitry . Mol Neurobiol 32 ( 3 ): 285 - 294 . doi:10.1385/MN: 32 :3: 285 Wrosch C , Scheier MF , Miller GE , Schulz R , Carver CS ( 2003 ) Adaptive self-regulation of unattainable goals: goal disengagement, goal reengagement, and subjective well-being . Personal Soc Psychol Bull 29 ( 12 ): 1494 - 1508 . doi:10.1177/0146167203256921 Yerkes RM , Dodson JD ( 1908 ) The relation of strength of stimulus to rapidity of habit-formation . J Comp Neurol 18 ( 5 ): 459 - 482 . doi:10.1002/cne.920180503 Zapf D ( 1993 ) Stress-oriented analysis of computerized office work . EJWOP 3 ( 2 ): 85 - 100 . doi:10.1080/09602009308408580


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Tobias Kärner. A mixed-methods study of physiological reactivity to domain-specific problem solving: methodological perspectives for process-accompanying research in VET, Empirical Research in Vocational Education and Training, 2017, 10, DOI: 10.1186/s40461-017-0054-3