Illusory correlation in interpersonal perception: A cognitive basis of stereotypic judgments

Abstract

Illusory correlation refers to an erronous inference about the relationship between categories of events. One postulated basis for illusory correlation is the co-occurrence of events which are statistically infrequent; i.e., obserbers overestimate the frequency of co-occurence of distinctive events. If one group of persons "occurs" less frequently than another and one type of behavior occurs infrequently, then the above hypothesis predicts that observers would overestimate the frequency that that type of behavior was performed by members of that group. This suggested that the differential perception of majority and minority groups could result solely from the cognitive mechanisms involved in processing information about stimulus events that differ in their frequencies of co-occurrences. Results of two experiments testing this line of reasoning provided strong supprt for the hypothesis. Implications of the experiments for the acquisition of stereotypes are discussed.