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 …

, the less likely cooperation will be. …

We consider the possibility that cooperation in a prisoner's dilemma is fostered by people's voluntarily enhancement of … cooperate when either one of these mechanisms is allowed. In agreement with theory, subjects aiming for cooperation choose … higher vulnerability levels in Gradual than in Leap, which maps into higher mutual cooperation levels. …

encourage cooperation may actually hurt morale, by convincing opportunistic team members to imitate and later take advantage of …

. Cooperation in such games can be sustained as a Nash equilibrium. Besides the efficient cooperative equilibrium there is also the … inefficient non-cooperative equilibrium. This paper investigates experimentally whether cooperation actually occurs in a simple …

behavior. I show that for a large class of parameters cooperation will emerge if the population is large; if the population is … population, the less likely cooperation will be. <BR><BR> …

-)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 …