We use skin conductance responses and self-reports of hedonic valence to study the emotional basis of cooperation and … punishment in a social dilemma. Emotional reaction to free-riding incites individuals to apply sanctions when they are available …. The application of sanctions activates a "virtuous emotional circle" that accompanies cooperation. Emotionally aroused …

from over 40 countries: individual exposure to war violence tends to increase social cooperation at the local level … societies, it appears to leave a positive legacy in terms of local cooperation and civic engagement. We discuss, synthesize and …

initial cooperation rates are similar, it increases in the groups with higher intelligence to reach almost full cooperation … differences in the response to past cooperation of the partner. In higher intelligence subjects, cooperation after the initial … difference is absent. Cooperation of higher intelligence subjects is payoff sensitive, thus not automatic: in a treatment with …

cooperation than male students …

There is continuing debate about what explains cooperation and self-sacrifice in nature and in particular in humans …

BoS, with high and low payoff inequality. In PD, disclosure markedly hampers cooperation, as higher intelligence players …

punishment is widely agreed to be potentially useful in fostering cooperation, many recent results in psychology and economics … interests, we find that privately implemented punishment reduces cooperation relative to a baseline treatment without punishment …Development of human societies requires cooperation among unrelated individuals and obedience to social norms. Although …