Risk perception and behavior: Pessimism,realism, and optimism about aids-related health behavior

Abstract

This study investigates the perceived risk of becoming infected with HIV for heterosexuals with multiple sexual partners, examines cognitive and motivational antecedents of biases in risk perception, and relates these biases to behavior. We obtained a moderate degree of optimism in a longitudinal study based on a sample of 535 visitors of a STD clinic. Further analyses—after classifying subjects as “pessimists”, “realists”, or “optimists”—revealed that pessimists were extremely pessimistic and optimists remarkably optimistic. Optimism increased with perceived control and decreased with prior experience, supporting a cognitive explanation of optimism. The data also provided some support for a motivational explanation: optimists who scored higher on a defensive coping style were more optimistic about their risks. Contrary to other findings, we found a positive relation between optimism and intentions to reduce risks. Furthermore, results revealed that optimists showed lower levels of subsequent behavioral risk. It was concluded that optimists were not unrealistically optimistic about their personal vulnerability. but rather that pessimists were unrealistically pessimistic. Previous behavior was found to be the best predictor of subsequent behavior. Although measures of perceived risk were also related to subsequent behavior, their predictive power was rather modest.