Decision making in giving game situation

Abstract

Indirect altruism is a key concept to improve group productivity but still a riddle. Especially human altruism exceeds the immediate bonds of kinship. In this study, we examine human decision making in situation Nowak & Sigmund(1998) hypothesized. Subjects decided cooperate/not cooperate unilaterally on virtual group setting in computer. The result showed high cooperation rate that suggest a possibility of indirect reciprocity. Moreover, subjects decision making imply a possibility of decision making strategy based on image score proposed by Nowak & Sigmund(1998), because their result varied with opponent's image score expressed opponent's behavior history.