Only giving orders? An experimental study of the sense of agency when giving or receiving commands
Only giving orders? An experimental study of the sense of agency when giving or receiving commands
Emilie A. CasparID 0 1
Axel Cleeremans 0 1
Patrick Haggard 1
0 Consciousness, Cognition and Computation Group (CO3), Center for Research in Cognition & Neurosciences (CRCN), ULB Neuroscience Institute (UNI), UniversiteÂ libre de Bruxelles (ULB) , Brussels , Belgium , 2 Institute of Cognitive Neuroscience, University College London (UCL) , London , United Kingdom
1 Editor: Marcello Costantini, University G d'Annunzio , ITALY
In human societies, agents are assumed to experience being the author of their own actions. These basic motoric experiences of action are influenced by social hierarchies, leading to surprising and morally significant results. Here we ask whether, under coercion, the sense of agency and responsibility pass from the person who receives orders to the person who gives them. Volunteers took turns to play the roles of `commander', `agent' or `victim' in a task where the commander coerced the agent to deliver painful shocks to the `victim'. We used `intentional binding' as an implicit measure of sense of agency in both commanders and agents, in conditions of coercion and free-choice. We observed a reduced sense of agency when agents received coercive instructions, relative to when they freely chose which action to execute. We also found that sense of agency in the commanders was reduced when they coerced agents to administer the shock on their behalf, relative to when they acted by themselves. This last effect was associated with the commander's selfreported level on a psychopathy scale. Thus, coercion resulted in neither commander nor agent feeling agency for the effect of the action, as measured through implicit methods. Our results could have profound implications for social decision-making and social regulation of moral behaviour.
Funding: EAC was supported by the FRS-F.N.R.S
(Belgium). PH was supported by EU FP7 grant
VERE WP1, AHRC grant L015145/1 to PH, and by
ERC Advanced Grant HUMVOL. PH was
additionally supported by an ESRC Professorial
Research Fellowship. AC is a Research Director
with the F.R.S.-FNRS (Belgium). This work was
All human societies require and endorse individual responsibility: people are aware of their
actions and their consequences. While all, or almost all, human actions have some external
consequences, actions made in a social context are particularly important because their effects
impact not only the agent herself but also other people. Thus, the feeling of responsibility is a
central aspect of the experience of agency in social contexts, and could be considered as a
precursor to morality [
]. The experience of responsibility is a core aspect of the mechanism that
constrains people to behave responsibly. At the same time, social factors can also constrain
responsibility: sometimes, individuals are expected to obey coercive orders. For example,
partly supported by BELSPO IAP grant P7/33 and
by ERC Advanced Grant RADICAL to AC.
people under military command are expected to obey orders unconditionally, and their
responsibility is not assessed in the usual way. The continuous balance between taking full
responsibility for individual actions, and passing responsibility to commanding authorities,
goes to the heart of how most societies work.
Nonetheless, history shows that the effects of coercion on the experience of responsibility
can profoundly affect moral behaviour [
]. Stanley Milgram famously conducted a series of
experiments that profoundly modified views of responsibility [3±4]. Milgram found that most
people could be coerced into administering what appeared to be painful punishments.
However, those experiments could not reveal how coercion influences behaviour. Today, the
mechanisms of coercion remain poorly investigated.
] recently measured the subjective experience of acting under coercion, and the effect
of compliance on neural processing. In one condition, an experimenter ordered one
participant to make a manual action that caused both an auditory tone, and either a simultaneous
financial penalty or a calibrated painful electric shock to a co-participant. These harmful
outcomes produced a financial gain for the participant. In another condition, participants chose
for themselves how often to inflict the harm, and thus how much financial gain to obtain.
Results showed that the social context of coercion reduced people's individual sense of agency
over their actions, as measured by the intentional binding effect, an implicit measure showing
compression of perceived temporal intervals between an action and its outcome [
to a free-choice condition. Explicit ratings of responsibility also showed a reduced feeling of
responsibility under coercion. In addition, we found that event-related potentials to the tone
exhibited reduced amplitude in the coercive condition, compared to a condition where
participants freely chose which action to perform. These results confirmed the potential for social
situations to modulate one's own sense of agency, and thus moral conduct.
Acting under coercion therefore reduces the feelings of both agency and responsibility for
one's own actions. But are the sense of agency and responsibility then passed on to the person
who gives the orders, as social and legal concepts of a chain of command might imply (i.e.,
ªpassing the buckº), or do they simply diffuse and disappear [
]? For example, military officers
are held responsible for the actions of men they command, and government ministers are (in
principle, if not always in practice) held responsible for the actions of civil servants working in
their departments. In the present experiment, we assessed what happens to the feelings of
agency and responsibility when one person commands another what to do.
To distinguish between these possibilities, we developed a paradigm in which three
volunteer participants were tested together, each playing in turn the roles of commander, agent and
ªvictimº. To assess the experience of responsibility and agency of each participant, we used
both implicit and explicit ratings. Feeling of responsibility were evaluated through explicit
]. To assess the implicit sense of agency, we used an established behavioural proxy based
on estimated action-outcome intervals (`intentional binding effect', [
]), rather than explicit
self-reports±since the latter are strongly influenced by social desirability biases  and do
involve different psychological processes [
]. In the intentional binding paradigm,
participants have to estimate the delay between their action (i.e. a keypress) and an outcome (i.e. a
tone). If the movement is voluntary, the perceived time is shorter than in a condition in which
the movement is involuntary (for instance, triggered by Transcranial Magnetic Stimulation
(TMS) pulse over the motor cortex, [
]). This suggests that identifying oneself as the author of
an action modifies time perception, by reducing it (see [
] for a review). Thus, in our study,
we focus on whether coercion increases the perceived interval between an action and its
outcome, i.e., reduces the sense of agency.
According to a ªsocially optimisticº hypothesis, when commanders give coercive orders
that are followed by the agents, the commanders should feel a strong sense of agency and
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responsibility, even if agents do not. Commanders should thus judge that action-outcome
intervals are short relative to a condition where they simply observe the agent choosing and
making the action and report high responsibility ratings. According to an alternative ªsocially
pessimisticº hypothesis, no difference between these two situations is expected±when one
person gets another to do something for her/him, neither person actually feels agency and
responsibility for the outcome. In this scenario, the person who issues the orders would not feel
responsible because even though she decides how to act, she does not actually carry out the act
herself. The person who executes the orders would likewise not feel agency and responsibility
for the outcomes because even though she carries out the action, she is not the one who chose
which action was to be carried out.
Such issuesÐagency in social chainsÐ, was explored in a previous study. Pfister et al. [
investigated whether performing an action (= leader) that leads a second agent (= follower) to
perform another action could influence implicit SoA. There was no evidence of subjective
compression of time, neither for leaders nor for followers, over the final outcome of the chain
(see their Experiment 2), which is consistent with our `socially pessimistic hypothesis'.
However, in their paradigm, the leaders had no strong decisional power, since they could only press
a single key when they wanted to do, a key that had no ecological consequences in the external
world. This may have thus reduced their SoA over the final consequence of the chain. In
contrast, the commander in our experiment could freely decide what order to give and when to
give it [
], thus controlling the action of the follower, and hence potentially influencing sense
of agency. Given that the research questions examined in the present study have been poorly
investigated in previous literature, we also included some more exploratory analyses, in an
effort to relate our sense of agency measures to other relevant psychological variables, such as
personality traits as measured through self-report questionnaires.
Experiment 1: Method
Materials and procedure. Participants completed several questionnaires online at least
three days before participating: The Interpersonal Reactivity Index (IRI, [
]), the Levenson
self-report psychopathy scale (LRSP, [
]) and the Social Dominance Orientation scale (SDO,
]). The order of the questionnaires was counterbalanced across participants.
On arrival at the experimental laboratory, participants read an information sheet about the
experimental procedure and the aim of the experiment. The three co-participants signed their
individual consent forms simultaneously, ensuring that they were all aware of the others'
consent. Roles were assigned based on where participants chose to sit when they arrived in the
room. One participant was the commander, another one was the agent and the third one was
the ªvictimº. These roles were switched during the experiment, making the procedure fully
reciprocal. The agent and the ªvictimº were sat at a table, face to face. A keyboard was placed
between them, oriented towards the agent but visible by all participants. The commander sat
at another, taller, table, placed near to the agent. The experimental task was controlled by a
computer located on the agent's right side, with the screen visible only to the agent and to the
commander. The agent was instructed to press one out of two keys on the keyboard at a time
she chose after the start of the trial, using either the right index finger or the right middle
finger. This caused a tone to occur. The delay between key press and tone was set to vary
randomly between 200, 500, and 800 ms. If a shock was delivered, the shock occurred at the same
time as the tone. The commander and agent then both made independent estimates of the
delay between the agent's key press and the tone. The `victim' also completed the task of
interval estimates in order to keep them engaged during the task, and to reinforce the symmetry of
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the situation. However, our research questions focussed on the experience of agents and
commanders, so the data from the `victim' were not further analysed. They were informed that the
delay would vary randomly on a trial-by-trial basis, between 0 and 1,000 ms (they were
reminded that 1,000 ms makes 1 s). Participants were also told to make use of all possible
numbers between 1 and 1,000, as appropriate, using the full scale as appropriate, and avoiding
rounding. Each participant received a paper sheet with 60 empty boxes for their time estimates
in each condition of the task. Participants' answers were hidden from view of the other
participants by a barrier, so as to avoid one participant influencing another.
A short training session allowed participants to practice the interval estimation procedure.
Two experimental conditions followed. All participants started with a specific endowment
(€20). In the free-choice condition, agents were instructed that they could freely choose to
increase their remuneration for the experiment by delivering a painful electric shock to the
ªvictimº, using the appropriate key on the keyboard F to deliver a shock and H to not deliver
the shock). Whether the agent delivered a shock or not, a similar tone occurred after the key
press. They were told that they were totally free to choose how to act. The agents earned €0.05
each time they decided to deliver a painful electric shock to the ªvictimº. They earned no
money if they decided not to deliver a shock. In this condition, the commander was simply a
passive observer. In the coercive condition, the commander stood next to the agent and
ordered the agent, on each trial, to deliver or not a painful electric shock to the ªvictimº (see
Fig 1). The commander was completely free to decide which order to give, and could thus
control the agent's actions. If the commander ordered the agent to deliver a shock, both
commander and agent earned €0.05. The experimenter sat in a corner of the experimental room,
and never interfered with participants' decisions.
There were 60 trials per condition (20 trials at each action-tone delay, in randomized
order), giving a total of 360 trials (120 per roles). The order of the free-choice and coercive was
counterbalanced across triads, but fixed within each triad.
Painful stimuli were delivered using a constant current stimulator (Digitimer DS7A)
connected to two electrodes placed on the back of ªvictimsº` left hand, visible to the agent and the
commander. Individual pain thresholds were determined for all three participants after they
had signed the consent form, and before starting the experiment. This threshold was
Fig 1. Experimental set-up of Experiment 1. In the free-choice condition, the agent was free to choose to deliver a shock or not (upper
row). The commander sat at another table, passively watching. In the coercive condition, the commander was standing rather than seated,
and ordered the agent to deliver a shock or not to the ªvictimº (lower row). Each participant took each role in turn (columns).
4 / 24
determined by increasing stimulation in steps of 1 mA, following the procedure described in
Caspar et al. [
] until participants reported a distinct pain sensation. The mean stimulation
level selected by this procedure was 23.84 mA (SD = 7.14, pulse duration: 200 μs). All
participants viewed the setting of each other's thresholds.
In a post-session questionnaire, we asked participants to rate how responsible they felt
during the experiment when they were the agent, and when they were the commander, as a
percentage score. We also asked participants to describe other feelings during the experiment.
The first item assessed how bad they had felt about giving shocks to the other participant, the
second how sorry they were (answers were provided on 7-point Likert scales; ª-3º; not very;
ª3º; very bad), the third how much they had looked at the other person's face during the
experiment (ª-3º; not much; ª3º; a lot) and how much pain they thought the other person had felt
(ª-3º; none at all; ª3º; a lot). Participants had to answer both describing their experience as
agent, and also as commander. In a first open question, participants were invited to explain if
they administered more, less or a similar number of shocks to the ªvictimº when they were
commander in comparison with when they were a free agent. They were invited to give open
commentary about their decisions during the experiment. On a scale ranging from -3 (not
very bad) to +3 (very bad), participants reported a mean score of .51 (SD = 1.73) when in the
role of the agent and a mean score of .77 (SD = 1.81) when in the role of the commanders. This
difference was not significant (p > .5). In a second open question, participants were invited to
describe briefly their feelings and thoughts during the experiment. These descriptions
confirmed that the participants were aware that their actions caused physical pain to their
co-participant, and that they generally ªfelt badº about doing so.
At the end of the experiment, participants were paid separately based on the original
endowment, plus any additional financial gain during the experiment.
Participants. Thirty-six right-handed and naïve participants were recruited by triads. All
participants were female to avoid possible effects of gender on relations of command and
coercion. Our recruitment procedure included checks to ensure that participants were not close
friends or relatives of others in their triad. To estimate the sample size, we used the effect size
of Experiment 2 in Caspar et al. [
]. That study had an effect size dz of 0.630 (based on the
means and SDs of the within-subjects free-choice (mean: 367, SD: 119) and the coercive
(mean: 426, SD: 131) conditions). To achieve a power of .90 for this effect size, the estimated
sample size was 29 (GPower: [
]). Participants received between €20 and €29 for their
participation. The following exclusion criteria were decided in advance of the experiment: failure to
produce temporal estimates covarying monotonically with actual action-tone interval, or
failure to follow instructions. To identify participants whom the action-tone intervals did not
gradually increase with action-tone intervals, we performed linear trend analysis with contrast
coefficients -1, 0, 1 for the three delays. One participant was excluded due to a non-significant
linear trend analysis. The mean age was 21.57 (SD = 1.98). All participants provided written
informed consent prior to the experiment. The study was approved by the local ethical
committee of the UniversiteÂ libre de Bruxelles (008/2016), and was carried out in accordance with
the approved guidelines. Individuals pictured on Fig 1 were not real participants. They gave
written informed consent (as outlined in PLOS consent form) to publish these case details.
Experiment 1: Results
No participants withdrew from the experiment, and none reported any distress either after
testing or at follow-up. During follow-ups, participants were invited to answer different
questions about how they had lived this experiment in the different roles. Answers could be given
by email or by phone (see Supporting Information S1 Text).
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Fig 2. A) Number of shocks. Number of shocks freely administered by participants when they were in the roles of agent and of commander. B)
Responsibility ratings (%) in post-experiment questionnaires. All tests were two-tailed. Errors bars represent standard errors. indicates a p
value < = .001. represents a p value between .01 and .05.
Number of shocks. When participants acted as agents, they freely chose to administer
painful electric shocks to the ªvictimº in 29.23/60 trials (CI95 = 24.58±33.87, min 1, max 60).
When participants acted as commanders, they freely chose to administer painful electric shock
to the ªvictimº in 31.57/60 trials (CI95 = 26.89±36.25, min 3, max 60). Because each participant
undertook both roles, we compared these choices directly with a dependent-samples t-test.
The difference was significant (t(34) = -2.090, p = .044, Cohen's d = .353, see Fig 2A), thus
showing that participants delivered more shocks to the `victim' when they were commanders
than when they were agents.
Responsibility ratings. Participants gave high responsibility ratings when they were free
agents (Mean 89%, CI95 = 83±94) and also when they were free commanders (Mean 81.5%,
CI95 = 72±91). The difference between these roles was not significant (p > .1). In contrast,
participants reported lower responsibility when they received orders (mean 41%, CI95 = 30±52)
compare to when they were free to decide which key to press (t(33) = 7.992, p < .001, Cohen's
d = 1.37) or free commander roles (t(33) = 5.296, p < .001, Cohen's d = .908, see Fig 2B).
Interval estimates. We analysed both commanders' and agents' interval estimates using a
Type III unbalanced repeated-measures ANOVA, with Role (Agent, Commander), Condition
(Free-choice, Coercive) and Outcome (Shock, No shock) as within-subject factors and Order
of the role as a between-subjects factor (see Fig 3A). This design was unbalanced, with 3
participants (8.5% of the total sample) had no data in at least one condition, because they chose
either to deliver no shocks at all, or to deliver only shocks. The main effect of Role was not
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Fig 3. A) Interval estimates. Estimated action-tone intervals (ms) in free-choice and the coercive conditions for agents and commanders,
pooling across the three action-outcome delays. The conditions have been named according to the agent's perspective: in the free-choice
condition, the agent was free to choose what to do and the commander was simply a passive observer. In the coercive condition, the agent
followed the commander's coercive instruction, while the commander was free to decide which order to give. B). Correlation. Correlation
between LRSP score and the effect of indirect agency, defined as the difference between interval estimates of commanders vs agents in free
choice conditions). All tests were two-tailed. Errors bars represent standard errors. indicates a p value < = .001. represents a p value
between .01 and .05.
significant (p > .4), suggesting that interval estimates did not differ when participants were
agents or commanders. The main effect of Condition was significant (F(1,29) = 8.254, p = .008,
η2partial = .222), with coercion leading to longer interval estimates (implying less sense of
agency) than free choice (482 ms, CI95 = 442±522 and 457 ms, CI95 = 420±493), suggesting
that coercion reduces the implicit feeling of agency, as measured through this method. The
main effect of Outcome was also significant (F(1,29) = 4.723, p = .038, η2partial = .140), with
longer interval estimates when a painful outcome was given (476 ms, CI95 = 439±513) than
when no painful outcome was delivered (463 ms, CI95 = 424±502). Most importantly for our
hypothesis, the interaction Role x Condition was significant (F(1,29) = 7.640, p = .01, η2partial =
.209). Paired comparisons indicated that interval estimates were shorter in the free-choice (437
ms, CI95 = 397±477) than in the coercive condition (487 ms, CI95 = 445±528) for agents (t(34)
= 4.343, p < .001, Cohen's d = .734), but that this difference (free-choice: 475 ms, CI95 = 432±
518 ±coercive: 477 ms, CI95 = 433±520) was not significant for commanders (p > .3). To
ensure that the absence of statistical difference was not due to lack of sensitivity in our data, we
computed Bayes Factors (BFs, [
]) to refine these results. A BF between 1/3 and 3 indicates a
lack of sensitivity. A BF below 1/3 or above 3 is typically interpreted as supporting for the null
hypothesis, or for the alternative hypothesis, respectively. To compute a BF, we used
Experiment 2 of Caspar et al. [
]. We selected this experiment because it is the first study published
which compared a free-choice and a coercive condition in a paradigm involving electric
shocks, and an implicit measure of sense of agency. No previous studies investigated SoA for
commanders in a similar paradigm, so we assumed that this previous study of the agent role
would provide a reliable basis to compute BFs for individuals from a similar population
playing a commander role. To calculate the BF, we computed the expected mean and SD of the
difference between the free-choice condition and the coercive condition [mean of plausibility
(population value/theory) = 56 ms] and SD of plausibility(population value/theory) = 61 ms).
The BF was 0.23, thus lending support to H0. This suggests that coercing another individual
7 / 24
did not differ from passively observing the situation in terms of our sense of agency measure.
The same interaction can also be considered by comparing the two conditions in which
agents/commanders had full decisional power (the free-choice condition for agents and the
coercive condition for commanders): in this case, interval estimates were shorter for agents
than for commanders (t(34) = 2.331, p = .026, Cohen's d = .394). When agents and
commanders had no decisional power (i.e., the coercive condition for agents and the free-choice for
commanders), their interval estimates did not differ (p > .4). The other interactions were not
significant (all ps > .1). Neither the main effect of Order (p > .8), nor its interaction with other
factors (all ps > .3) were significant. A series of additional analyses were then conducted.
Given that participants were free to decide the number of harmful actions to deliver when they
were agents and commanders, we also reanalysed the data using this information (number of
shocks freely delivered when commanders±number of shock freely deliver when agents) as a
covariate. This covariate was not significant (p > .9) and the general pattern of results was
unchanged. We also reanalysed the data by correcting each participant's interval estimates by
subtracting the real action-tone delay from the judged action-tone delay for each trial in order
to control the unbalanced distribution of delays (200, 500, 800 ms) across within-subject
factors (see S1 Fig). The general pattern of results was unchanged (see Section a in S2 Text), but
the Outcome factor was no longer significant (p > .5). Finally, we additionally conducted
further analyses including Delay between the agent's keypress and the tone as a within-subject
factor in order to investigate the effects of duration of the action-outcome intervals. Section b
in S2 Text shows the analyses, which mainly showed that the coercion effect for agents was
stronger for long action-effect intervals than for short action-effect intervals.
We conducted further exploratory analyses. To assess whether or not some self-reported
personality traits could influence the ªcoercion effectº (i.e., the difference between the
freechoice and the coercive condition) a forced-entry regression method was used to fit a multiple
linear regression model. We centred the overall score of all predictor variables (IRI, LRSP and
SDO) before building the model. Two participants did not answer all the questions of the
online questionnaire, so their data were not taken into account. We observed that none of the
predictor variables modified the coercion effect, neither for agents (all ps > .1), nor for
commanders (all ps > .1). S1 and S2 Tables show supplemental results for similar correlations
performed with the individual subscales of these instruments, where available.
We also investigated the effect of personality on an estimate of the ªdirect agency effectº,
defined as difference in interval estimates when freely chose as a commander (and coerced
another person to enact their choice), relative to when they chose and acted directly as an
agent. A negative score on this difference measure indicates that interval estimates were
shorter, and thus sense of agency stronger, when commanding others, compared to acting
directly. Given that multiple correlations were performed, we applied a Bonferroni correction
(α/3 = 0.016). We found a strong relation between LSRP score and the direct agency effect (t
(32) = 2.921, p = .007, Beta = .497). The higher participants scored on LSRP (i.e., more
psychopathic traits), the less they tended to feel a sense of agency when making free choices in the
commander role, relative to the direct agent roleÐproducing a positive score on our indirect
agency measure (see Fig 3B). Importantly, the same analyses conducted on the corrected
interval estimates (real action-tone delayÐjudged action-tone delay for each trial) also lead to
similar results, with a strong correlation only with the LSRP (t(32) = 3.106, p = .004, Beta = .531).
Supplementary analyses revealed that the secondary psychopathy subscale (impulsivity, poor
behavioural control) of the LSRP was a better predictor (t(32) = 3.263, p = .003, Beta = .491)
than the primary psychopathy subscale (also named `callousness', p > .3). Other predictors
(IRI, SDO) were not significant (all ps > .05). S3 Table shows results for similar regressions for
specific subscales. We additionally investigated whether or not our direct agency measure
8 / 24
could predict the difference between the number of shocks administered by agents and
commanders, but we found no significant relation (p > .8).
Experiment 1: Discussion
Hierarchies frequently involves a form a diffusion of responsibility between those who make
decisions, and those who translate them into action. To our knowledge, the present study is
the first attempting to systematically explore how individuals' sense of agency varies between
the role of decider and the role of executor in an ecological paradigm.
First, we observed that agents reported longer interval estimates in the coercive
condition than in the free-choice condition, replicating previous results [
]. Importantly, in
this experiment, the orders were not given by an experimenter as previously, but rather by
another participant who was free to decide which order to give. This suggests that the
reduction of the implicit experience of agency is a common feature of coercive situations.
The basic effects of coercion on sense of agency do not require a social structure or
institution of ªauthorityº [
]. Rather, coercive modulation of agency may arise whenever
individuals find themselves in low-power relations [
], even when these are transient and
reversing, as here. This finding adds generality and ecological validity to previous reports
of coercion effects on sense of agency [
]. We additionally found a modest but significant
main effect of outcome, with longer interval estimates, implying lower sense of agency,
when actions produced shocks compared to when they did not. Reduced sense of agency
for negative outcomes has been reported previously, using event timing estimates [21±
22], although this effect was not statistically significant in our previous study with painful
]. We speculate that the size, and thus significance, of this effect may depend
on differences between experiments in the emotional valence associated with the
outcomes (negative vocalisations versus painful electric shocks associated with a monetary
reward in [
] and [
Second, we observed a striking increase in interval estimates, corresponding to a reduced
sense of agency, when participants' instructed another person to carry out their intentions,
compared to when they themselves made the action. When commanders coerced another
participant to implement their free choices, rather than doing it themselves, they appeared to
distance themselves from the outcome of their intentions, and felt less agency. Our implicit
measures showed lower sense of agency for such indirect, mediated coercive actions than for
direct freely-chosen actions. Interestingly, exploratory analyses revealed that this effect was
significantly related to individuals' psychopathy scores. The higher participants scored on
primary psychopathy, the greater the difference between interval estimates when coercing
another agent, vs when acting as free agent oneself was. Thus, we may have identified an
important trait variable relevant to the diffusion of responsibility that occurs when people
coerce others, which should be confirmed in future studies.
Interestingly, we found a dissociation between implicit feeling of agency and explicit report
of responsibility for commanders, but not for agents, in Experiment 1. Commanders reported
high responsibility scores when they gave orders to the agent, but showed greater interval
estimates, implying a reduced sense of agency, relative to performing an action themselves. This
dissociation might be explained by the fact that explicit measures are strongly biased by social
desirability factors: commanders know that they should feel responsibility and thus report that
they do feel it, even though they may not actually feel it. Implicit measures of agency are less
influenced by such demand factors. Importantly, the commanders' high explicit responsibility
ratings confirm that they understood the psychological issues associated with the role of
9 / 24
Our first experiment involved an important confound between low-level and high-level
features of social roles. In particular, our participants made manual actions to trigger the tones
and shocks when they acted as agents, but merely gave spoken instructions, which ultimately
and indirectly lead to tones and shocks, when they acted as commanders. Thus, the difference
between agent and commander roles is confounded with the direct causation of the outcome.
The vast majority of sense of agency studies, particularly those using implicit measures, have
focused on direct causal control over outcomes via manual actions [6,23±24]. Therefore, the
lower sense of agency for commanders rather than agents might reflect an absence of manual
action and direct causation, rather than a specific effect of social role. In situations of coercion,
commanders indeed do not act by themselves. Rather, they impose their decisions onto a third
party, who actually executes them. In neurocognitive terms, coercion splits the action control
system across two individuals, so that the higher cognitive processes of action selection take
place in the commander's brain, while the lower-level motoric processes of action execution
take place in the executor's brain. Previous studies have highlighted the importance of
sensorimotor signals for the sense of agency [25±29]. We suggest that commanders' reduced sense of
agency when they coerce others in Experiment 1 may reflect the lack of the normal
sensorimotor information that underpins experiences of direct agency.
In a second experiment, we tested this hypothesis directly, by introducing a situation where
the commander gave their coercive instructions not by verbal instruction as in Experiment 1,
but by a manual action that more directly lead to the shock. In order to control for the
presence of manual actions in all the experimental conditions, commanders had to press a key that
delivered an instruction also in the free-choice condition. To preserve a feeling of freedom for
agents, we thus told them that they could freely decide to follow or not this command.
Indirectly, we thus offered the possibility to agents to obey or disobey the commander's
instructions. Previous research showed that an increased effort [
] and an increase in the number of
alternative actions [
] both increase the feeling of agency. Choosing to go against coercive
instructions should therefore lead to a greater sense of agency than being coerced. This
modification also allowed us to control for causal events preceding the agent's keypress [
one could assume that the reduction of agency in the coercive condition for agents is due to
the occurrence of some event (i.e. the commander's instruction) preceding the keypress, rather
than due to the coercive content of that event per se. This additional antecedent event is not
present in free-choice conditions, thus potentially explaining the difference between
conditions. However, experiment 2 balances this potential antecedent event across conditions.
Specifically, in the free-choice condition of Experiment 2, commanders instructed the agents
when to press a key (just as in the coercion condition), but the agents were free to decide
whether to follow the instruction or not. Thus, in experiment 2, coercion and choice were
different contexts, but the events were identical across conditions.
Finally, we also included a `predictability' factor in the coercive condition in Experiment 2:
the instruction that the commander sent by pressing one of two keys was either fully
predictable from the key pressed (coercive predictable condition) or only predictable on 50% of trials
(coercive unpredictable condition). Previous studies have showed that unpredicted outcomes
reduce SoA [
] and should thus constitute a ceiling effect in the reduction of agency.
Again, the socially optimistic hypothesis predicts shorter interval estimates when the
commander's orders are applied by the agent in comparison with a situation in which the agent
does not follow those orders. We further predicted that the commander's more direct motoric
involvement in causing the shock would increase their feeling of agency when they gave orders
that are executed by the agent. Importantly, in Experiment 2 we could not directly compare
agents and commanders' interval estimates since participants in each role judged the delay
between their own motor action and the resulting tone. Thus, the action judged was not
10 / 24
physically identical for agents and for commanders, and the action-outcome intervals differed.
Some of the analyses performed in Experiment 1, namely the direct agency effect, could thus
not be investigated in Experiment 2. However, whenever possible, we performed statistical
analyses comparing Experiments 1 and 2.
Experiment 2: Method
Materials and procedure. The procedure was globally similar to Experiment 1, with the
same three reciprocal roles. In Experiment 2, the participant who was the commander sat at
another table, similar in size to agent's and ªvictim'sº table (see Fig 4). A keyboard was placed
between the agent and the ªvictimº, oriented towards the agent but visible to all three
participants. Another keyboard was placed in front of the commander, and was invisible to both the
agent and the ªvictimº. The agent and commander could both see the screen running the task
program. For both the commander and the agent, two keys on their respective keyboards were
marked ªshockº and ªno shockº. The commander was instructed to press whichever of these
two keys she wished, in her own time. This caused a coercive instruction to appear on the
agent's screen: ªdeliver a shockº or ªdo not deliver a shockº. The agent responded to this
instruction by pressing the corresponding key (ªshockº or ªno shockº) on her own keyboard.
After 200, 500 or 800 ms, a tone occurred. If a shock was delivered, the ªvictimº received the
shock at the same time as the tone. The agents and ªvictimsº both independently estimated the
delay between the agent's keypress and the tone. The commanders' task was to estimate the
delay between her own keypress and the tone. Participants were told that the delay would vary
randomly but that the tone would always occur within 1 s of the agent's action. No upper limit
was mentioned for commanders' interval estimates, because their delay depended on the delay
for the agent to respond to the commander's instruction displayed on the screen.
Commanders were simply told that if they thought that the delay was exactly 1 second, then they could
Fig 4. Experimental set-up of Experiment 2.
11 / 24
report 1000 ms on the answer sheet and if they thought that the delay was half a second, they
could answer 500, etc. They were told that the interval could have any duration, and would
vary from trial to trial. They were asked to avoid rounding their estimates. The commanders
wore headphones during the entire experiment: this prevented them from hearing the agent's
keypress but nevertheless allowed them to hear the tone, as verified in a pilot test. In addition,
we ensured that the agent's keypress was not directly visible to the commander, by placing the
electrical stimulator immediately in front of the agent's response keys. We ensured that this
was the case by asking commanders whether or not they could see the agent's keypress. This
procedure aimed to reduce perceptual bias for the commander's interval estimates.
The experiment began with a short training session, in which participants could practice
the task and the interval estimate procedure, followed by three experimental conditions in
counterbalanced order. In the coercive predictable condition, commanders were instructed
that they were totally free to choose to deliver a shock to the ªvictimº, or not, by pressing the
corresponding key on their keyboard. The commander's decision was immediately displayed
on the agent's screen as a coercive instruction (for instance, if the commander pressed the key
ªshockº, the instruction ªdeliver a shockº was displayed on the screen, see Fig 5). The agent
was instructed to always follow the instruction by pressing the corresponding key on their own
keyboard. Both the commander and the agent earned €0.05 each time the commander decided
to deliver a painful electric shock to the ªvictimº. In the coercive unpredictable condition, the
commander could again freely choose which key to press, but the mapping between their
choice and the instruction displayed to the agent was random. Participants were informed of
this unpredictable mapping. The agents were instructed to follow the instructions displayed on
the screen, and were aware that this might or might not match the commander's decision on
that trial or not. The commander could see if the instruction matched her keypress by viewing
the screen on which financial reward for actual shock events was shown. Again, both the agent
and the commander earned +€0.05 each time a shock was delivered to the ªvictimº, signalled
by a visual feedback on the screen. Finally, In the free-choice condition, the commander again
pressed one of the two keys to predictably display her order on the agent's screen, but the
agent was told that she could follow this instruction, or not, as she freely chose. In this
condition, the €0.05 for delivering a shock was given only to the agent, not the commander. The
experimenter sat in a corner of the experimental room, and did not interfere in any way with
There were 60 trials per condition (20 trials at each action-tone delay, in randomized
order), giving a total of 540 trials (180 per role). The order of the three experimental conditions
was counterbalanced during the experiment but the order of these conditions was the same
within each triad.
The pain procedure was similar to Experiment 1. In Experiment 2, the mean stimulation
level selected by this procedure was 31.53 mA (SD = 16.74, pulse duration: 200 μs).
In a post-session questionnaire, we asked participants to rate how responsible they felt
during the experiment in each experimental conditions when they were agent and commander.
The same questions as in Experiment 1 were asked. They were also invited to freely write a few
words about how they felt and what they thought during the experiment. At the end of the
experiment, participants were paid separately based on their earned financial gain during the
Participants. Thirty-three right-handed, naïve female participants were recruited by
triads, as before. Participants received between €25 and €38.5 for their participation. Two
participants were excluded due to a non-significant linear trend in analyses relating their interval
estimates to the actual action-outcome interval. The mean age was 22.29 (SD = 2.55). All
participants provided written informed consent prior to the experiment. The study was approved
12 / 24
Fig 5. Schematic representation of the three experimental conditions, according to the role. In each case, the commander freely chose to administer a shock in the
example trial shown.
by the local ethical committee of the UniversiteÂ libre de Bruxelles (008/2016), and was carried
out in accordance with the approved guidelines. Individuals pictured on Fig 3 were not real
participants. They gave written informed consent (as outlined in PLOS consent form) to
publish these case details.
Experiment 2: Results
Number of shocks. When participants were agents, and thus made for themselves the
manual action that could lead to the shock, they freely chose to administer painful electric
shocks to the ªvictimº in 36.26/60 trials CI95 = 31.67±40.85, min 3, max 60). When participants
were commanders and thus used the agent to apply their orders, they freely chose to
administer painful electric shock to the ªvictimº in 31.32/60 trials (CI95 = 25.94±36.71, min 2, max 60).
13 / 24
Fig 6. A) Number of shocks. Comparison of the number of shocks freely administered by agents (in the free-choice condition) and by
commanders (in the coercive (predictable) condition) across Experiments 1 and 2. B) Responsibility ratings of agents. C) Responsibility
ratings of commanders. All tests were two-tailed. Errors bars represent standard errors. indicates a p value < = .001. represents a p
value between .01 and .05.
This difference was significant (t(30) = 2.592, p = .015, Cohen's d = .465). Interestingly, the
direction of the effect reversed the pattern seen in Experiment 1. We thus compared the
number of shocks freely administered by agents and commanders in Experiments 1 and 2 (see Fig
6A for the differences between each experiment). A repeated-measures ANOVA with Role
(agent, commander) as within-subject factor and Experiment (1,2) as between-subject factor
was conducted on the number of shocks freely administered. Neither the main effect of role (p
> .2), nor the main effect of experiment (p > .2) were significant. The interaction role x
experiment was significant (F(1,64) = 11.450, p = .001, η2partial = .152). Independent sample t-tests
revealed that the number of shocks freely delivered by commanders did not differ between
Experiment 1 and 2 (p > .9), suggesting that giving orders verbally or by the means of a
keyboard did not influence the results. Rather, the difference between the two experiments lay in
the free choices when in the agent role: Participants in Experiment 2 administered more
shocks to the `victim' in the free-choice condition than in Experiment 1 (t(64) = -2.183, p =
.033, Cohen's d = .762). Possible interpretations of this difference between experiments are
given in the general discussion.
Responsibility ratings. We conducted a repeated-measures ANOVA on responsibility
ratings with Role (Agent, Commander) and Condition (Free-choice, Coercive predictable,
Coercive Unpredictable) as within-subject factors. The main effect of Role was significant (F
(1,30) = 5.338, p = .028, η2partial = .151), with higher responsibility ratings when participants
were in the role of the commander (65%, CI95 = 58±72) then when they were in the role of the
agent (52%, CI95 = 44±60). We also observed a main effect of Condition (F(2,60) = 52.402, p <
.001, η2partial = .636). The interaction Condition x Role was significant (F(2,60) = 5.148, p <
.01, η2partial = .146). When they were agents, participants reported feeling more responsible in
the free-choice condition (83%, CI95 = 73±93) than in the coercive predictable condition (37%,
CI95 = 24±49, t(30) = 6.289, p < .001, Cohen's d = 1.12) and, than in the coercive unpredictable
condition (36%, CI95 = 24±48, t(30) = 7.269, p < .001, Cohen's d = 1.30). Responsibility ratings
in the coercive predictable condition and the coercive unpredictable condition did not differ
(p > .8), see Fig 6B. When they were commanders, participants reported feeling more
responsible in the coercive predictable condition (90%, CI95 = 82±98, p > .2) than in the coercive
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unpredictable condition (64%, CI95 = 55±72, t(30) = 5.897, p < .001, Cohen's d = 1.05) and,
than in the free-choice condition (42%, CI95 = 30±54, t(30) = 7.054, p < .001, Cohen's
d = 1.26). Responsibility ratings were also higher in the coercive unpredictable condition than
in the free-choice condition (t(30) = -3.981, p < .001, Cohen's d = -.714), see Fig 6C. As in
Experiment 1, responsibility ratings were similar when participants were free agents or free
commanders (p > .2), thus showing that acting by one's self or coercing another individual to
carry out the action leads to a similar perceived responsibility.
Interval estimates. In Experiment 2, we could not directly compare agents and
commanders' interval estimates, since the intervals judged were different. To recap, agents judged
the delay between their own keypress and the tone, while commanders had to judge the delay
between their own keypress and the tone. Importantly, only the agent's keypress led directly to
the outcome, while the commander's keypress did not. The commander's keypress simply
displayed the order on the agent's screen. We therefore performed separate repeated-measures
ANOVAs for the agents, and for the commanders.
We analysed agents' interval estimates using a Type III unbalanced repeated-measures
ANOVA, with Condition (Free-choice, Coercive Predictable, Coercive Unpredictable) and
Outcome (Shock, No shock) as within-subject factors and Order of the role as a
between-subjects factor (see Fig 7A). This design was unbalanced because 3 participants (9.6% of the total
sample) had no data with or without shocks in at least one condition. The main effect of
Condition was significant (F(2,52) = 3.643, p = .033, η2partial = .123). Agents' interval estimates
were shorter, suggesting a stronger sense of agency, in the free-choice condition (372 ms, CI95
= 312±432) than in the coercive predictable condition (413 ms, CI95 = 350±476, t(28) = -2.482,
p = .019, Cohen's d = -.460) and, than the coercive unpredictable condition (411 ms, 95%
CI = 353±470, t(29) = -2.311, p = .028, Cohen's d = -.421). The coercive predictable condition
and the coercive unpredictable condition did not differ (p > .9). The main effect of Outcome
was significant (F(1,26) = 8.884, p = .006, η2partial = .255), with longer interval estimates when
a painful outcome was given (413 ms, CI95 = 354±472) than when no painful outcome was
delivered (384.5 ms, CI95 = 328±440). The interaction Condition x Outcome was not
significant (p > .7), nor the interactions with Order (all ps > .5). We repeated this analysis using the
number of trials in which agents decided to disobey as a covariate, and found that the general
pattern of results was unchanged. A forced-entry regression method was used to fit a multiple
linear regression model. As in Experiment 1, we observed that none of the overall scores on
Fig 7. A) Interval estimates for agents. B) Interval estimates for agents in the free-choice condition according to commanders' instructions.
All tests were two-tailed. Errors bars represent standard errors. represents a p value between .01 and .05.
15 / 24
the questionnaires predicted the coercion effect (defined as the difference between estimates in
the coercive predictable condition±free-choice condition; all ps > .4). S4 Table describes the
result of multiple linear regressions with each subscale.
We additionally investigated whether obeying vs disobeying the commander influenced
agents' interval estimates. We therefore conducted an unbalanced repeated-measures ANOVA
with Obedience (Obedience, Disobedience) and Outcome (Shock, No shock). Because the
frequency of disobedience varied widely (S2 Fig and S3 Text), percentage of disobedient trials
was used as a covariate. Ten participants (32.2% of the total sample) had no data in at least one
condition, due to the pattern of the commander's instructions and/or their own choices to
obey or disobey them. Neither the main effect of Obedience (p > .7), nor the main effect of
Outcome (p > .9) were significant, but the interaction between them was (F(1,19) = 4.663, p =
.044, η2partial = .197, see Fig 7B). Interval estimates were shorter when participants refused to
administer a shock when the commander requested to do so (329 ms, CI95 = 264±395),
compared to when participants administered a shock while the commander requested not to do so
(360 ms, CI95 = 291±429, t(21) = 1.776, p = .090). This result implies a modest trend towards
increased sense of agency in conditions of prosocial vs antisocial disobedience. Conversely,
when participants obeyed the commander's instruction, there was no difference in interval
estimates between trials with or without a shock (p > .2).
In Experiment 2, the actual action-tone intervals of commanders were not fully under our
control since these intervals depended on when the agents pressed the key in response to the
visual instruction sent by the commanders' keypress. We therefore corrected the commanders'
interval estimates by subtracting the real action-tone delay from the judged action-tone delay
for each trial. This produced a judgement error that could be compared between conditions.
Note that an underestimate of the actual interval corresponds to a negative value. We then
analysed commanders' corrected interval estimates using a repeated-measures ANOVA, with
Condition (Free-choice, Coercive Predictable, Coercive Unpredictable) and Outcome (Shock,
No shock) as within-subject factors and Order as a between-subjects factor (see Fig 8). Neither
the main effect of Condition (p > .3), nor the main effect of Outcome (p > .8), nor their
interaction (p > .6) were significant. The interaction Outcome x Order was just significant (F(2,26)
= 3.407, p = .049, η2partial = .208) but not investigated further because it was not predicted
from our experimental hypotheses. As in Experiment 1, none of the general score of
selfFig 8. Interval estimates for commanders. All tests were two-tailed. Errors bars represent standard errors. represents a p value between
.01 and .05.
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reported personality questionnaires (LSRP, IRI, SDO) explained the coercion effect (all ps >
.7). S6 Table in Supporting Information describes the results of multiple linear regression with
Experiment 2: Discussion
Behavioural results indicated that agents' interval estimates were shorter in the free-choice
condition than in the coercive predictable and the coercive unpredictable conditions. These
results, in line with Experiment 1 and our previous study [
], again suggest that receiving
orders reduces the implicit feeling of agency. It also suggests that the coercion effect cannot
simply be an artefact of the presence of an additional instruction event in our first experiment
]. Again, we found no interaction with the outcome factor. That is, free-choice conditions
produced stronger intentional binding than coercion conditions, whether the action lead to a
shock or not. In Experiment 1, we could not identify whether the reduced sense of agency
displayed by commanders giving coercive orders, compared to agents making free choices was
due to the lack of any manual sensorimotor signal when commanding, or due to the cognitive
process of mediating one's agency by coercing another individual. In Experiment 2,
commanders gave their orders through a keyboard and had to judge the delay between their own
keypress and the tone, thus controlling for the role of sensorimotor signals. Results showed
that commanders' interval estimates did not differ between the free-choice and the coercive
conditions, being predictable or not thus supporting the socially pessimistic hypothesis. This
suggests that the crucial difference between being an agent vs being a commander does not lie
in the form of motor action (verbal or manual), but in the (social) role in determining the
outcome for the `victim'. Importantly, the intervals judged by the commanders were longer and
more variable than that those judged by agents, because the interval judged by the
commanders included the agent's reaction time to the instruction. In principle, therefore, we cannot
exclude the possibility that commanders failed to show intentional binding simply because the
time delays that they judged exceeded those at which intentional binding is normally found.
However, this seems unlikely, since several studies have reported binding effects at delays
comparable to those judged by the commanders, and indeed at delays up to 4 s [
]. It remains
unclear whether intentional binding increases or decreases as delays increase, since both
results have been reported [
]. Interval estimation and events timing methods may give
different results in this regard. In our own data, using interval estimation, we found that the
coercion effect for agents' intentional binding was stronger at longer delays. This makes it unlikely
that the absence of any significant coercion effect in the commanders simply reflected the
longer intervals that they judged. Another reason for this reduction of agency for commanders
may be that all participants knew in advance that they would play the three roles, namely
commander, agent and `victim'. This role reversal procedure may have contributed to increase the
perception of diffusion of responsibility and thus to a reduction of agency for each role. This
could be tested in future between-subject experiments in which each participant plays only
either the commander or the agent role.
In the free-choice condition of Experiment 2, agents could disobey the commander's
instructions. The results showed that choosing to resist coercive commands did not reliably
boost the implicit sense of agency, even though this could represent a higher prosocial goal.
Our agents were instructed that they could disobey whenever they wanted in the free-choice
condition. In this sense, resisting the commander's orders might be seen less as an act
disobedience towards the commander, and more as an application of the instructions given by the
experimenter. In addition, the disobedience rate was quite low overall (32%), and highly
variable between participants. Thus, our design may have only limited ecological validity for
17 / 24
studying disobedience in everyday settings. Future studies could develop new designs
specifically to investigate resistance to coercion.
Previous studies showed that coercion reduces the primary experience of agency for agents
]. The main objective of the present study was to investigate if SoA might be transferred
from the coerced to the coercer in social situations. This hypothesis would imply that
commanders themselves experience a strong implicit SoA and responsibility over the consequences
of their orders, even if someone else actually performs the action. This hypothesis is `socially
optimistic' in the sense that someone at least retains a feeling of agency and responsibility in
situations of coercion. It may have some echoes in social conventions such as the military
tradition that the officer becomes responsible for the conduct of her or his soldiers, or the notion
that parents are responsible for the behaviour of their young children.
In both Experiments 1 and 2, agents' interval estimates were shorter in the free-choice
condition than the coercive condition, thus confirming that obeying coercive commands reduces
SoA even when the causal chain is controlled, thus replicating previous results. It additionally
shows that the reduction of the implicit experience of agency under coercion does not depend
on the social status of the person who gives the orders, but rather reflects a common feature of
Making a free choice between actions with harmful vs non-harmful impacts on another
person thus increases the feeling of agency, compared to being instructed which action to
choose. However, this boost in sense of agency with free choice was only present when
participants directly executed the action through their own motor system, and were thus not only
free, but also true agents. We indeed observed in Experiment 1 than when participants freely
commanded someone else to make the action for them, the sense of agency was not boosted
over and above a condition where they merely watched the agent choose. Experiment 1 only
shows that the commander does not perceive SoA with respect to the agent's action, since
commanders had to judge the temporal delay between the agent's keypress and the tone.
Therefore, Experiment 1 rules out the simplest version of the socially optimistic hypothesis: we
found that sense of agency is not simply transferred from the coerced to the coercer in
situations of coercion. However, Experiment 1 does not reveal how commanders experience SoA
over their own actions, but rather focused on commanders' experience of the action of a
Therefore, in Experiment 2, we focused on the commanders' experience of their own
action. We observed that, when commanders estimate the delay between their own action and
a tone, they do not experience a stronger SoA when they give coercive orders in comparison
with a condition in which they give orders which are not truly coercive, in the sense that the
agent may disobey them. In normal situations, choosing and executing an action gives lower
interval estimates, implying stronger SoA, than merely executing it [
]. The situation of
commanders seems to be an exception to this rule. Put another way, commanders' sense of agency
is not boosted when they choose between outcomes compared to when they do not,
presumably because they do not actually execute the action themselves, but rely on the agent to do it
for them. Importantly, this cannot be explained by a lack of comprehension of the
experimental conditions, since the explicit ratings of responsibility of commanders showed that their
explicit experience of responsibility decreased when they knew their commands could be
disobeyed. Thus, Experiments 1 and 2 together suggest that having the power to decide which
action to perform is not sufficient to produce a full sense of agency, and that ability to
manually control the outcome (shock vs. no shock) is necessary for a full sense of agency to emerge.
18 / 24
In other words, choosing an outcome, but delegating the motor action that directly causes it to
another person does not produce a full sense of agency. This suggests that the psychological
process of using another individual to carry out one's own intentions reduces the experience
of agency compared to directly making the action oneself, even when the initial motor action
is comparable in both cases.
Interestingly, our exploratory analysis found that individual differences appear to modulate
the reduction of agency when coercing someone else. Some individuals experienced similar
feelings of agency when they were commanders and when they were free agents. Those
individuals scored low at the Levenson self-reported psychopathy scale. Conversely, psychopathic
traits appeared to increase the risk that people fail to feel responsible when in the commander
role. The reported prevalence of high trait psychopathy in business leaders [38±39] may
therefore seem worrying. However, given the exploratory nature of these analyses, future studies
should pursue this question with a more targeted experimental design, and larger samples.
Many social species are organized according to a dominance hierarchy that greatly
influences the persistence of the group [
]. While many nonhuman species are organized
according to a linear hierarchy, humans frequently participate in multiple hierarchies, in which they
play varying roles [
]. For instance, the same person may be both a mere employee in a
professional context, but a dominant figure within a family or leisure circle. The hierarchical
nature of human social structures has profound effects on responsibility for action, and on
morality. Leaders frequently, and perhaps necessarily, delegate the execution of their decisions
to others. Several types of evidence from moral psychology suggest this indirectness softens the
subjective evaluation of harms committed [42±44]. In one variant of his seminal experiment,
] observed that when participants did not administer the punishment themselves,
but rather observed another person physically implementing their decision, obedience
increased from 65% to 92.5%. One obvious mechanism may be that leaders who delegate
execution to others may lack direct evidence about potential negative impacts of their decisions
on others. For example, in political and social situations, leaders can get others to `do their
dirty work'. However, our Experiment 1 found reduced sense of agency in leaders for both
harmful and non-harmful outcomes, thus suggesting a more general effect.
Consistent with these theories, we observed in Experiment 1 that participants administered
more painful electric shocks to the `victims' when they played the role of commander than
when they played the role of agent. This result confirms that indirect agency increases
antisocial behaviours relative to direct agency, and that this tendency can be captured in laboratory
settings. Interestingly, however, a simple change to the information protocol in Experiment 2
produced the reverse result: now participants inflicted more electric shocks to the `victims'
when they played the role of agents, than when the played the role of commanders. While this
difference was not initially predicted, we believe it can be explained because of the difference
in the information available to the victim in the two experiments. Experiment 1 was
`informationally transparent', in that all three participants knew, in every trial and condition, who was
responsible for the decision to shock or not. In contrast, the actions in experiment 2 were
untraceable by `victims'. That is, the `victims' in Experiment 2 did not know whether the
decision to harm or not was taken by the agent or by the commander, because they did not see the
screen by which the commander communicated to the agent. Even in the `free-choice'
condition of Experiment 2, where the agent could disobey the commander's instruction, the `victim'
had no way of knowing, on any given trial, whether they did so or not. The setup of the
experiment ensured that the agent and the commander were both aware that the `victim' could not
know the source of the decision. We speculate that this lead agents to `hide' their own decision
behind the commanders' instruction, unknown to the `victim'. For example, in the free-choice
condition, the commander might transmit to the agent an instruction not to shock, but the
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agent might choose to disobey this instruction and actually shock the `victim'. In this case, the
`victim' could not know whether the shock they received had been decided by the commander
or the agent. This lack of information may have allowed agents to diffuse their sense
responsibility to the commanders±since the `victim' could not know whether the agent was `only
obeying orders' of was acting voluntarily. This form of diffusion of responsibility might be
described as `informational': people may feel less responsibility when they know that the social
context makes it difficult to recover whether their action was freely-chosen or not. Many
famous historical and legal decisions turn on this problem.
In coercion situations, the cognitive functions of action choice and action execution are
split across two separate individuals' brains. One person chooses and commands, and another
person acts accordingly. This represents a fundamental transformation of the classical model
of human voluntary action, in which a person first decides, and then executes their actions. In
the coercive situation, neither the agent nor the commander appear to experience agency for
the outcome, as measured by our implicit `intentional binding'. Taken together, our results
could be read as socially pessimistic for human voluntary action: coercive situations potentially
undermine responsibility in both agents and commanders. However, our results also suggest
high contextual sensitivity of sense of agency since exploratory analyses showed that
selfreported personality traits modulate SoA of commanders when giving orders. This raises the
interesting possibility of training the sense of responsibility±embedding such training into
society, for example through education, could be protective against the potential moral hazards
of loss of responsibility through coercion.
S1 Text. Debriefing mail.
S2 Text. Section a) EXPERIMENT 1. Repeated-measures ANOVA with Role (Agent,
Commander), Condition (Free-choice, Coercive), Outcome (Shock, No shock) as within-subject
factors and Order of the role as a between-subjects factor on corrected interval estimates.
Section b) EXPERIMENT 1. Repeated-measures ANOVA with Role (Agent, Commander),
Condition (Free-choice, Coercive), Outcome (Shock, No shock) and Delay (200, 500, 800 ms) as
within-subject factors and Order of the role as a between-subjects factor on corrected interval
S3 Text. EXPERIMENT 2. Disobedience rates.
S1 Table. EXPERIMENT 1. Multiple linear regression coefficients with each subscale of the
questionnaires as the independent variables and the ªcoercion effectº of agents as the
S2 Table. EXPERIMENT 1. Multiple linear regression coefficients with each subscale of the
questionnaires as the independent variables and the ªcoercion effectº of commanders as the
S3 Table. EXPERIMENT 1. Multiple linear regression coefficients with each subscale of the
questionnaires as the independent variables and the ªdirect agency effectº as the dependant
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S4 Table. Multiple linear regression coefficients with each subscale of the questionnaires
as the independent variables and the ªagent's coercion effectº as the dependant variable.
S5 Table. Section a) EXPERIMENT 2. Multiple linear regression coefficients with each
subscale of the questionnaires as the independent variables and antisocial disobedience as the
dependant variable. Section b) EXPERIMENT 2. Multiple linear regression coefficients with
each subscale of the questionnaires as the independent variables and prosocial disobedience as
the dependant variable.
S6 Table. EXPERIMENT 2. Multiple linear regression coefficients with each subscale of the
questionnaires as the independent variables and the ªcorrected commander's coercion effectº
as the dependant variable.
S1 Fig. Graphical representation of the agents' and commanders' corrected interval
estimates. All tests were two-tailed. Errors bars represent standard errors. indicates a
p value < = .001.
S2 Fig. Disobedience rates. Percentage of trials in which agents decided to disobey in the
freechoice condition, either to administer a shock while saying not to (antisocial disobedience) or
not to administer a shock while saying to (prosocial disobedience). Test was two-tailed. Errors
bars represent standard errors.
EAC was supported by the FRS-F.N.R.S (Belgium). PH was supported by AHRC grant
L015145/1 to PH, and by ERC Advanced Grant HUMVOL. AC is a Research Director with the
F.R.S.-FNRS (Belgium). This work was partly supported by BELSPO IAP grant P7/33 and by
ERC Advanced Grant RADICAL to AC. The authors declared that they had no conflicts of
interest with respect to their authorship or the publication of this article.
Source Data. The behavioural data reported in this paper have been published on Open
Science Framework (OSF±DOI 10.17605/OSF.IO/478TJ)
Formal analysis: Emilie A. Caspar.
Funding acquisition: Axel Cleeremans, Patrick Haggard.
Investigation: Emilie A. Caspar.
Methodology: Emilie A. Caspar.
Project administration: Emilie A. Caspar.
Resources: Emilie A. Caspar.
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Software: Emilie A. Caspar.
Supervision: Axel Cleeremans, Patrick Haggard.
Validation: Emilie A. Caspar.
Visualization: Emilie A. Caspar.
Writing ± original draft: Emilie A. Caspar.
Writing ± review & editing: Emilie A. Caspar, Axel Cleeremans, Patrick Haggard.
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