Social categorization moderates social projection

When categorized into social groups, people view members of in-groups, but not members of out-groups, as being similar to themselves. In three experiments, social categorization moderated the spread of social projection in both minimal and value-tagged laboratory groups and regardless of whether individual perceivers judged both groups or only one. The categorization effect tracked changes in the perceiver's group status so that most perceivers projected only to present but not past in-groups. The lack of out-group projection supported an anchoring hypothesis, according to which self-referent information is engaged only when it is considered applicable to the judgment at hand. The induction hypothesis and the differentiation hypothesis, which predicted positive and negative out-group projection, respectively, were not supported. Implications for theories of intergroup perception and bias are discussed. (C) 2001 Elsevier Science (USA).