Stressful Life Events and Reward Processing in Adults: Moderation by Depression and Anhedonia

Area of Science:

• Neuroscience
• Psychology
• Behavioral Science

Background:

• Acute stress impacts reward processing in controlled settings.
• The link between naturalistic stressful life events and reward processing is less understood.
• Depression and anhedonia may influence this relationship.

Purpose of the Study:

• To investigate the association between recent stressful life events and reward processing.
• To examine if depression and anhedonia moderate this association.

Main Methods:

• Secondary analysis of 107 adults from prior community studies.
• Stressful life events assessed via contextual interview with independent ratings.
• Reward processing evaluated using a probabilistic reward task.

Main Results:

• Greater uncontrollable stressful life events correlated with poorer reward learning in current-depressed and high-anhedonia participants.
• Conversely, low anhedonia was linked to enhanced reward processing with increased stressful life events.

Conclusions:

• Depression and anhedonia increase vulnerability to blunted reward learning from uncontrollable stressors.
• Heightened reward processing in the absence of anhedonia may be an adaptive response to stress.