Sustained consummatory reward processing deficits in remitted melancholic depression.

Area of Science:

• Neuroscience
• Psychiatry
• Cognitive Psychology

Background:

• Depression is linked to altered reward processing, even during remission.
• Melancholic depression may present more pronounced reward-related impairments.
• Neural abnormalities in reward processing phases require investigation in remitted melancholic depression.

Purpose of the Study:

• To investigate neural abnormalities during reward anticipation and consumption in remitted melancholic depression.
• To compare neural responses between melancholic depression (MD), remitted melancholic depression (rMD), and healthy controls (HCs).

Main Methods:

• Utilized the monetary incentive delay (MID) task with event-related potential (ERP) recording.
• Included 31 participants with MD, 32 with rMD, and 32 HCs.
• Analyzed neural signals during reward anticipation and consumption phases.

Main Results:

• No significant difference in reaction time between rMD and MD groups; RT marginally prolonged in rMD vs. HCs.
• No significant intergroup difference in cue-P3 amplitude during reward anticipation.
• Reward positivity (RewP) magnitude was diminished in rMD and MD groups compared to HCs during reward consumption.
• RewP positively correlated with behavioral activation and hedonic tone, and negatively with depressive symptoms.

Conclusions:

• Remitted melancholic depression is associated with persistent impairments in reward consumption.
• Attenuated RewP may serve as a potential susceptibility marker for depression recurrence.