Cognitive bias in procedural justice: formation and implications of illusory correlations in perceived intergroup fairness.

Illusory correlations in procedural justice were investigated in 2 experiments. After receiving information describing the fair and unfair treatment of 2 groups' members by police, participantsjudged the fairness of each group's treatment. Illusory correlations formed in both experiments, resulting in erroneous associations between the smaller group and the infrequent type of treatment. In Experiment 2, participants made harsher guilt judgments of members of the group perceived as receiving relatively favorable treatment. Mediational evidence suggests that differences in guilt judgments reflected attempts to compensate for perceived injustice, creating real differences in group treatment. The benefit of incorporating cognitive biases in models of procedural justice is discussed.