Social Identification and a Solution to Social Dilemmas

The study explored whether cooperation could be promoted by identification with an in-group. A game was used to create two groups independent of each other. Thirty-six Japanese undergraduate students participated in the game, followed by a social dilemma game. Analysis revealed a two-factor structure of social identification: identification with the group and identification with its members. As predicted from social identity theory, subjects showed a significantly higher level of cooperation when the dilemma game was played with in-group members than with out-group members. Furthermore, identification with the group affected both in-group bias and cooperative behavior in the social dilemma game, but this effect was not found for identification with members.