Familiarity and categorization in intergroup behavior

Several studies have shown that social categorization into groups, unaffected by other variables such as own interest, interpersonal relations, conflict of interests, previous hostility, etc., was a sufficient condition to induce discrimination against an outgroup. The purpose of the present study was to test the hypothesis that the subjects' uncertainty and insecurity in a novel situation was, at least in part, responsible for this phenomenon. Two groups of subjects were tested: one group was made familiar with the social and physical setting of the experiment in a situation closely resembling the actual experiment, and came back for a second session in which the actual experiment was conducted; the second group came only for the actual experimental session. The results clearly indicate that, contrary to the hypothesis, the “familiar” group engaged in more out-group discrimination than the “unfamiliar” one. The theoretical and methodological implications of this finding are discussed.