Direct and indirect reciprocity are key mechanisms for the evolution of cooperation. Direct
reciprocity means that individuals use their own experience to decide whether to cooperate …

Background Donor hearts and lungs are more susceptible to the inflammatory physiologic
changes that occur after brain death. Prior investigations have shown that protocolized …

Indirect reciprocity is a key explanation for the exceptional magnitude of cooperation among
humans. This literature suggests that a large proportion of human cooperation is driven by …

Gossip is often invoked as playing a fundamental role for creating, sustaining, or destroy ing
cooperation. The reason seems straightforward: gossip can make or break someone's …

We study environments in which agents are randomly matched to play a Prisoner's
Dilemma, and each player observes a few of the partner's past actions against previous …

Indirect reciprocity is a major mechanism in the maintenance of cooperation among
unrelated individuals. Indirect reciprocity leads to conditional cooperation according to …

Human cooperation in large groups can emerge when help is channeled towards
individuals with a good reputation of helping others. Evolutionary models suggest that, for …

We study the evolution of cooperation in a model of indirect reciprocity where people interact
in public and private situations. Public interactions have a high chance to be observed by …

Direct reciprocity is a mechanism for cooperation among humans. Many of our daily
interactions are repeated. We interact repeatedly with our family, friends, colleagues …

Collective intelligence refers to the ability of groups to outperform individual decision-
makers. At present, relatively little is known about the mechanisms promoting collective …