Distinctiveness threat and prototypicality: combined effects on intergroup discrimination and collective self‐esteem

The combined influence on ingroup bias of threat to group distinctiveness and prototypicality as a group member was examined in two studies. It was predicted, in line with social identity theory, that threat to group distinctiveness would lead to more ingroup bias. In addition, on the basis of self-categorization theory it was predicted that protypical and peripheral group members would react differently to a threat to their group distinctiveness. Only group members who define themselves as prototypical group members should be motivated to defend their threatened distinctiveness by engaging in increased ingroup bias. This hypothesis was first supported in a modified minimal group setting in which threat was operationalized as overlapping group boundaries. These results were then replicated in a second study, using better-established groups, for whom distinctiveness threat was manipulated in terms of intergroup similarity. Moreover, some support was found in Study 2 for the prediction that the opportunity to engage in intergroup differentiation can, under restricted conditions, enhance group-related self-esteem. © 1997 John Wiley & Sons, Ltd