Category Boundaries Can Be Accentuated Without Increasing Intergroup Bias

Two studies tested whether the boundaries separating groups could be strengthened without increasing intergroup bias. Using a modified minimal group paradigm, the salience of the group distinction was manipulated through instructions that either called attention to the division between the two groups (high salience), or to dimensions orthogonal to group boundaries (low salience). High salience increased both perceived differences between the groups and perceived similarities within the groups. Moreover, participants demonstrated classic intergroup bias, expressing a preference for the ingroup over the outgroup. Critically, however, the magnitude of intergroup bias was not greater in the high salience condition. Study 2 replicated these effects using real groups with a preexisting stereotype. The results suggest that models of prejudice reduction need not rely on minimization of perceived group boundaries in order to be effective.