Modeling Approach Motivation in Terms of Perceptual Biases Involving Appetitive Stimuli

Abstract

Accumulating evidence suggests a potential relationship between approach motivation and perceptual enhancement. The current investigation was undertaken with the goal of exploring the causes of the phenomenon as well as implications for personality. Below, a model is introduced to help explain the causes and consequences of relations between approach motivation and perceptual size. Two studies are then presented testing a number of assumptions made by the model. In Study 1 (n = 78), state-related variations in approach motivation were manipulated with the intent of sensitizing the perceptual system to appetitive stimuli. It was predicted that such sensitization would result in greater size estimations. In Study 2 (n = 123), size overestimates were used to assess relations between daily events and outcomes. It was hypothesized that individual differences in size estimations for appetitive words (relative to neutral words) would predict daily motivations, emotion, and behaviors, as well as reactivity to daily events. In addition, several individual difference variables ostensibly related to dopamine activity were assessed in both studies and entered as moderators of the degree to which size overestimations varied by stimulus type. Many of the hypotheses were not supported, but size overestimations did, as hypothesized, moderate relations between positive events and goal-related motivation.