Abstract
The purpose of this study was to investigate effects of interpersonal relationships in everyday life on ingroup bias and cooperative behavior in experimental group situation. Eighty-seven female subjects were asked to complete questionnaires about daily interpersonal relationships, which measured identification with others and consciousness of their own roles. The subjects were randomly assigned to two groups, and were asked to evaluate group members' attributes and to divide 100 points between self and ingroup in social dilemma paradigm. The results indicated that: (a) ingroup bias about ability evaluation negatively correlated with identification with family; (b) cooperative distribution positively correlated with consciousness of their own family role.
