Cooperation is beneficial but may be hard to achieve in situations where the selfish interests of individuals conflict … and studied with the methods of formal game theory, experimental economics and computer simulations. It allows exploration … show that partner choice strongly facilitates cooperation and leads to networks where free-riders are likely to be excluded. …

opportunity for profitable cooperation. Our experimental method creates two groups of subjects who are similar but have different … long-run losses. Initially similar, cooperation rates for groups with different intelligence levels diverge, declining in … groups of lower intelligence, and increasing to reach almost full cooperation levels in groups of higher intelligence …

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 …

hampers cooperation, as higher intelligence players are less cooperative once they are made aware that they play against …

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

Existing research supports two opposing mechanisms through which positive mood might affect cooperation. Some studies … have suggested that positive mood produces more altruistic, open and helpful behavior, fostering cooperation. However … reduced use of information, hampering cooperation. We find evidence that suggests the second hypothesis dominates when playing …