“I won, but I'm not getting my hopes up”: Depression moderates the relationship of outcomes and reward anticipation

Abstract 

Major Depressive Disorder (MDD) in adolescents is characterized by alterations in positive emotions and reward processing. Recent investigations using functional magnetic resonance imaging (fMRI) find depression-related differences in reward anticipation. However, it is unknown whether feedback influences subsequent reward anticipation, which may highlight the context of reward processing. Ten youth with MDD and 16 youth with no history of MDD completed an fMRI assessment using a reward task. Reward anticipation was indexed by blood oxygen level dependent signal change in the striatum following winning, losing, non-winning, and non-losing outcomes. A significant interaction between diagnostic status and outcome condition predicted reward anticipation in the caudate. Decomposition of the interaction indicated that following winning outcomes, depressed youth demonstrated reduced reward anticipation relative to healthy youth. However, no significant differences between depressed and healthy youth were found after other outcomes. Reward anticipation is altered following winning outcomes. This finding has implications for understanding the developmental pathophysiology of MDD and suggests specific contexts where altered motivational system functioning may play a role in maintaining depression.

Keywords: Major depression, Reward, fMRI, Adolescence, Striatum, Context