A model of persuasion suggests that individuals comply with a prediction of their behavior because they are persuaded by that prediction; a model of threat suggests that they defy prediction because of its threat of control. College students with either internal (N=20) or external (N=20) loci of control were informed of the accuracy of the experimenter's purported prediction of their previous choices between pairs of inkblot cards. Predictions were either personal (based on personality tests) or impersonal (based on group norms). A control group of ten internals and ten externals was not informed of the predictions. All subjects then rated each card one at a time. The measure of compliance or defiance consisted of the mean ratings of the predicted cards minus the mean ratings of the unpredicted cards. Results revealed a significant two-way interaction of locus of control and locus of prediction. Externals complied with impersonal predictions and defied personal predictions; internals complied with personal predictions and defied impersonal prediction. (NRB)