Mental illness, predictability, and affective consequences as stimulus factors in person perception.

Abstract

Before and after attempting to predict the behavior of a stimulus person (SP) in a choice situation, 64 Ss were asked to record their impressions of him on a trait rating scale. By design (a) the SP was presented as normal or mentally ill, (b) his behavior was predictable or unpredictable, and (c) errors of prediction were or were not signaled by a noxious buzzer. As predicted, evaluative judgments of the mentally ill SP did not vary as a function of predictability unless predictive failures were accompanied by unpleasant consequences, and unless the SP himself had control over the delivery of these consequences. Judgments of the normal SP were solely a function of his predictability, regardless of the consequences of predictive failure. (PsycINFO Database Record (c) 2006 APA, all rights reserved)