the study investigates factors that affect members' satisfaction of mashhad cattle husbandry cooperatives. the required data and information were collected via interviews and questionnaires from cattlemen. cattlemen of mashhad constitute the statistical population of the study. using cochran formula, 60 cattlemen were selected randomly as the sample in 2013. spss software package was used to an...

Although it is expected that a social dilemma is solved by giving people feedback information about others' cooperative behavior, previous studies demonstrated that the information may promote cooperative behavior in some situations but may promote non-cooperative behavior in other situations. The study hypothesize that the feedback information of the others' cooperative behavior promote cooper...

We analyze the Iterated Prisoner’s Dilemma and the performance of GRADUAL, the best behavior found so far. This behavior has the undesirable property of permanent memory, which would be detrimental for stability. As a solution to the permanent memory problem, we propose an adaptive tit-for-tat behavior that uses a self-regulated estimate of the opponent’s friendliness. On a second level, we dem...

Research on video games has yielded consistent findings that violent video games increase aggression and decrease prosocial behavior. However, these studies typically examined single-player games. Of interest is the effect of cooperative play in a violent video game on subsequent cooperative or competitive behavior. Participants played Halo II (a first-person shooter game) cooperatively or comp...