Cooperation is essential for complex biological and social systems and explaining its evolutionary origins remains a … central question in several disciplines. Tag systems are a class of models demonstrating the evolution of cooperation between …

: group risk concern, group cooperation expectation, and pressure to conform to social norms. We found that ex post guilt … concerns drive groups to choose the cooperation (and risk-reduction) strategy more frequently than individuals. Groups also … have higher cooperation expectations for their corresponding groups than individuals have for their corresponding …

-)establishing cooperation. The strategy is compared to well-known strategies in the domain and results presented. The initial findings, as well …

considered. We find that the "intelligence" of the players plays a crucial role in the way players learn to cooperate. The …

cooperation in an artificial society. In this framework the environmental pressure to cooperate is controllable by a single … results from experiments that implemented and tested environments based upon this new model of cooperation. The results show … that the pressure to cooperate leads to the evolution of communication skills facilitating cooperation. Furthermore, higher …