The development of subjective group dynamics: When ingroup bias gets specific

Children aged 6-7 years and 10-11 years evaluated an in-group or out-group summer school and judged in-group or out-group members whose attitudes towards the summer schools were either normative or anti-normative. According to a subjective group dynamics model of intergroup processes, intergroup differentiation and intragroup differentiation co-occur to bolster the validity of in-group norms. The hypothesis that this process develops later than simple in-group bias was confirmed. All children expressed global in-group bias, but differential reactions to in-group and out-group deviants were stronger among older children. Moreover, the increasing relationship, with age, between in-group bias and evaluative preferences for in-group and out-group members that provide relative support to in-group norms, is mediated by the degree of perceptual differentiation among group members