The effects of intergroup similarity and goal interdependence on intergroup attitudes and task performance

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Abstract

The concept of similarity occupies an important place in several theories of social relations. An experiment was designed to examine the effects of both status and attitudinal similarity under intergroup competition or cooperation. Previous research had indicated that the usual attractive effects of similarity would be most evident in cooperative contexts, while similarity might lead to divergence under competition due to threats to group identity. Two hundred eight school children participated in a 2 × 3 × 2 factorial experiment (nature of Task × outgroup Status × outgroup Attitudes). Results indicated that, contrary to hypothesis, simple attitude similarity led to a general increase in liking for and cooperativeness toward the outgroup, unaffected by goal relations. However, on ratings of group performance, status and attitudinal similarity combined did lead to increased intergroup differentiation, again unaffected by goal relations. Finally, subjects' performances on the experimental task (a verbal and arithmetical reasoning test) were reliably affected by goal relations: highest performance being observed under intergroup cooperation, particularly with same or lower status outgroups, or with outgroups which had different attitudes. It is concluded that the need for positive distinctiveness in intergroup relations may compromise or even reverse the usual relationship between similarity and attraction.

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