Typicality and group variability as dual moderators of category-based inferences

We propose and test two alternative hypotheses bearing on the dual roles of group variability and typicality when people form impressions of single category members. The latitude of acceptance hypothesis suggests that a wider range of individual group members are likely to be seen as good-fitting members (i.e., typical) if the group is heterogeneous, thereby increasing the extent to which stereotypical attitudes are used as a basis for responding to these persons. In contrast, the typicality-functionality hypothesis suggests that typicality plays different roles depending on group variability. This view suggests that typicality plays the "gatekeeper function" as postulated by Fiske and Neuberg (1990) when the group is homogeneous, but not when it is heterogeneous. Across two studies, stronger support was found for the typicality-functionality hypothesis. Implications for the extant literature on category-based processing are discussed.