Social support mediates the effects of childhood unpredictability on anhedonia: A retrospective investigation in an online adult community sample

Increasingly, research is highlighting the implications of exposure to unpredictable environments during childhood (i.e., “childhood unpredictability”) on outcomes in adulthood. Converging evidence from preclinical and clinical studies has implicated childhood unpredictability in disrupted reward processing and anhedonia. From the stress generation literature, altered social support has emerged as a possible mechanism by which this effect may occur. In the current study, our goal was to understand whether the pathway from childhood unpredictability to anhedonia occurs through reduced perceptions of social support. Toward this end, we recruited an online community sample of adults in the US (N = 242) to complete surveys assessing childhood unpredictability, depressive symptoms, anhedonia, and social support, as well as a novel online version of the Probabilistic Reward Task. We found that childhood unpredictability was associated with increased depressive symptoms and anhedonia (but not objective measure of anhedonia), and reduced perceptions of social support in adulthood. Mediation analyses revealed a significant indirect effect of perceived social support on the association between childhood unpredictability and anhedonia, controlling for age, sex, and non-anhedonic depressive symptoms. Unexpectedly, measures of reward responsiveness from the behavioral task were not related to childhood unpredictability. The current findings replicate previous reports linking childhood unpredictability and self-reported anhedonia, and extend them to incorporate the potential mediating pathway of reduced social support. Implications for treatment for anhedonia are discussed.