oPrisoner’s dilemma game Media Equation

en computer agent. Three experiments were performed. The result suggested that the participants ’ selection monal uman situat d as an common problems that underlie many social phenomena such as destruction of environment, ambient pollution, development of desertification, overhunting, protected trade, entrance examina-tions, illegal parking, and dust pollution (Hardin, 1968). There is a long history of studies on social dilemmas. One rep-resentative series of laboratory studies analyzed decision making using a dilemma task (Messick & Brewer, 1983). The most popular ing mutual cooperation, stopping egoistic pursuits for short-term benefits, and (2) mutual trust appears among the group members, confirming that the other members do not fail to cooperate. The Tit for Tat (TFT) strategy is known to be an effective strategy for inducingmutual cooperationwhereparticipants dowhatever the other player did in the previous trail. They cooperatewhen the other cooperated and defect when the other did not. In Axelrod (1980a), a computer tournamentwasheld inwhich a total of 14 strategieswere tested. Selection rules were submitted by experts in game theory from a variety of disciplines: psychology, political science, econom-ics, sociology, and mathematics. The winner was TFT. A more ⇑ Corresponding author