Intragroup differentiation in terms of ingroup and outgroup attributes

An experiment (n = 36) was conducted to test the hypothesis that attribute typicality moderates intragroup differentiation. The predicted reversal from perceived relative ingroup homogeneity on typical ingroup attributes to perceived relative outgroup homogeneity on typical outgroup attributes was confirmed for both homogeneity measures (standard deviation and probability of differentiation). But the ingroup homogeneity effects were more reliable than the outgroup homogeneity effects. Relative ingroup size (minority versus majority) was included in the experimental design as a between-subjects factor but did not qualify the reversal of perceived relative homogeneity.