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Group size effects and critical mass in public goods games

Understanding whether the size of the interacting group has an effect on cooperative behavior has been a major topic of debate since the seminal works on cooperation in the 1960s. Half a century later, scholars have yet to reach a consensus, with some arguing that cooperation is harder in larger groups, while others that cooperation is easier in larger groups, and yet others that...

Cooperation on dynamic networks within an uncertain reputation environment

Reputation plays a key role among the mechanisms supporting cooperation in our society. This is a well-known observation and, in fact, several studies have shown that reputation may substantially increase cooperation among subjects playing Prisoner’s Dilemma games in the laboratory. Unfortunately, recent experiments indicate that when reputation can be faked cooperation can still...

Quantitative account of social interactions in a mental health care ecosystem: cooperation, trust and collective action

Mental disorders have an enormous impact in our society, both in personal terms and in the economic costs associated with their treatment. In order to scale up services and bring down costs, administrations are starting to promote social interactions as key to care provision. We analyze quantitatively the importance of communities for effective mental health care, considering all...

Improving transportation networks: Effects of population structure and decision making policies

Transportation networks are one of the fundamental tools for human society to work, more so in our globalized world. The importance of a correct, efficient design of a transportation network for a given region or country cannot be overstated. We here study how network design is affected by the geography of the towns or nuclei to be connected, and also by the decision process...

The emergence of altruism as a social norm

Research journals • PubMed • Google Scholar Search for Ismael Rodríguez-Lara in:Nature Research journals • PubMed • Google Scholar Search for Angel Sánchez in:Nature Research journals • PubMed • Google

Equal status in Ultimatum Games promotes rational sharing

Experiments on the Ultimatum Game (UG) repeatedly show that people’s behaviour is far from rational. In UG experiments, a subject proposes how to divide a pot and the other can accept or reject the proposal, in which case both lose everything. While rational people would offer and accept the minimum possible amount, in experiments low offers are often rejected and offers are...

Humans expect generosity

Mechanisms supporting human ultra-cooperativeness are very much subject to debate. One psychological feature likely to be relevant is the formation of expectations, particularly about receiving cooperative or generous behavior from others. Without such expectations, social life will be seriously impeded and, in turn, expectations leading to satisfactory interactions can become...

Emotions and Strategic Behaviour: The Case of the Ultimatum Game

Human behaviour in economic interactions has attracted an increasing amount of attention over the last decades. The economic assumption that people would behave focusing on their own material self-interest was proved incomplete, once the empirical evidence consistently showed that many other motives may influence such behaviour. Therefore, models that can incorporate rational...

Cooperation Survives and Cheating Pays in a Dynamic Network Structure with Unreliable Reputation

), Departamento de Matemáticas, Universidad Carlos III de Madrid, 28911 Leganés, Madrid, SpainAlberto Antonioni, Angel Sánchez & Marco TomassiniInstituto de Biocomputación y F sica de Sistemas Complejos (BIFI ... for Alberto Antonioni in:Nature Research journals • PubMed • Google ScholarSearch for Angel Sánchez in:Nature Research journals • PubMed • Google ScholarSearch for Marco Tomassini in:Nature Research

Hierarchy is Detrimental for Human Cooperation

Studies of animal behavior consistently demonstrate that the social environment impacts cooperation, yet the effect of social dynamics has been largely excluded from studies of human cooperation. Here, we introduce a novel approach inspired by nonhuman primate research to address how social hierarchies impact human cooperation. Participants competed to earn hierarchy positions...

Dynamics to Equilibrium in Network Games: Individual Behavior and Global Response

Various social contexts can be depicted as games of strategic interactions on networks, where an individual’s welfare depends on both her and her partners’ actions. Whereas much attention has been devoted to Bayes-Nash equilibria in such games, here we look at strategic interactions from an evolutionary perspective. To this end, we present the results of a numerical simulations...

Towards a Proper Assignment of Systemic Risk: The Combined Roles of Network Topology and Shock Characteristics

The 2007-2008 financial crisis solidified the consensus among policymakers that a macro-prudential approach to regulation and supervision should be adopted. The currently preferred policy option is the regulation of capital requirements, with the main focus on combating procyclicality and on identifying the banks that have a high systemic importance, those that are “too big to...

Reputation drives cooperative behaviour and network formation in human groups

for Angel Sánchez in:Nature Research journals • PubMed • Google Scholar Contributions J.C., C.G.-L., Y.M. and A.S. designed and performed research, analyzed the data and wrote the paper; A.F. designed

Transition from reciprocal cooperation to persistent behaviour in social dilemmas at the end of adolescence

While human societies are extraordinarily cooperative in comparison with other social species, the question of why we cooperate with unrelated individuals remains open. Here we report results of a lab-in-the-field experiment with people of different ages in a social dilemma. We find that the average amount of cooperativeness is independent of age except for the elderly, who...

Revealing patterns of local species richness along environmental gradients with a novel network tool

(GISC), Departamento de Matemáticas, Universidad Carlos III de Madrid, Avenida de la Universidad 30, 28911 Leganés, SpainMara Baudena, Angel Sánchez & Co-Pierre GeorgInstituto de Biocomputación y Física ... , Miguel Á. Rodríguez & Miguel A. Zavala AuthorsSearch for Mara Baudena in:Nature Research journals • PubMed • Google ScholarSearch for Angel Sánchez in:Nature Research journals • PubMed • Google

Wavelets Application in Prediction of Friction Stir Welding Parameters of Alloy Joints from Vibroacoustic ANN-Based Model

This paper analyses the correlation between the acoustic emission signals and the main parameters of friction stir welding process based on artificial neural networks (ANNs). The acoustic emission signals in Z and Y directions have been acquired by the AE instrument NI USB-9234. Statistical and temporal parameters of discomposed acoustic emission signals using Wavelet Transform...

Empathy Emerges Spontaneously in the Ultimatum Game: Small Groups and Networks

The Ultimatum game, in which one subject proposes how to share a pot and the other has veto power on the proposal, in which case both lose everything, is a paradigmatic scenario to probe the degree of cooperation and altruism in human subjects. It has been shown that if individuals are empathic, i.e., they play the game having in mind how their opponent will react by offering an...

Generosity Pays in the Presence of Direct Reciprocity: A Comprehensive Study of 2×2 Repeated Games

By applying a technique previously developed to study ecosystem assembly [Capitán et al., Phys. Rev. Lett. 103, 168101 (2009)] we study the evolutionary stable strategies of iterated 22 games. We focus on memory-one strategies, whose probability to play a given action depends on the actions of both players in the previous time step. We find the asymptotically stable populations...

A comparative analysis of spatial Prisoner's Dilemma experiments: Conditional cooperation and payoff irrelevance

, discussed the analyses and wrote the paper. Competing interests The authors declare no competing financial interests. Corresponding author Correspondence to Angel Sánchez. Rights and permissions This ... journals • PubMed • Google ScholarSearch for José A. Cuesta in:Nature Research journals • PubMed • Google ScholarSearch for Yamir Moreno in:Nature Research journals • PubMed • Google ScholarSearch for Angel