Reward Processing in Binge-Type Eating Disorders
摘要
Theories and research suggest that alterations in reward processing are associated with binge eating (i.e., out of control over-eating episodes). This chapter summarizes the evidence for reward processing alterations in individuals with binge eating, focusing on three distinct phases: before reward receipt (anticipation), during or immediately following reward receipt (response), and the process by which individuals integrate information about reward outcomes over time (learning). Although findings are mixed regarding whether individuals with binge eating differ from individuals without binge eating on self-reported responses to food rewards (e.g., images, tastes, smells), findings suggest alterations in neural responses to food rewards. Specifically, research consistently supports heightened neural response to food images; however, whether individuals with and without binge eating differ on neural responses to food consumption is less clear. Moreover, individuals with binge eating demonstrate heightened anticipation of food when measured via self-report and behavioral tasks. Although the construct of reward learning has been studied less than other reward processing constructs in relation to binge eating, preliminary evidence suggests that habitual responding may be elevated in those with binge eating. Taken together, there is evidence for reward processing alterations in individuals with binge eating, but the nature of these alterations depends on the specific reward phase and measurement being used.