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Win and Loss Responses in the Monetary Incentive Delay Task Mediate the Link between Depression and Problem Drinking.

Yu Chen1, Isha Dhingra1, Thang M Le1

  • 1Department of Psychiatry, Yale University School of Medicine, New Haven, CT 06519, USA.

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Depression and alcohol misuse share brain activity patterns during reward processing. These overlapping neural markers suggest common causes for these frequently co-occurring conditions.

Keywords:
AUDITBDI-IIalcohol misusecomorbiditydepressionfMRImediation analysismonetary incentive delay taskneural markersreward processing

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Addiction Research

Background:

  • Depression and alcohol misuse often occur together and are linked to altered reward processing.
  • Previous research has not identified shared neural markers for reward processing in these conditions.

Purpose of the Study:

  • To investigate shared neural correlates of reward processing between depression and alcohol misuse.
  • To explore the relationship between the severity of alcohol misuse and depressive symptoms.

Main Methods:

  • fMRI scans during a monetary incentive delay task (MIDT) in 43 healthy adults.
  • Assessment of alcohol misuse using the Alcohol Use Disorders Identification Test (AUDIT).
  • Assessment of depression severity using Beck's Depression Inventory (BDI-II).
  • Whole-brain regression analyses and mediation analyses were conducted.

Main Results:

  • AUDIT and BDI-II scores were positively correlated.
  • Shared neural activations for win and loss processing were found in frontoparietal regions, parahippocampal gyri (PHG), superior temporal gyri (STG), and cerebellum.
  • These shared regional activities fully mediated the relationship between depression and alcohol misuse scores.

Conclusions:

  • Depression and alcohol misuse share common neural substrates in reward processing.
  • These findings support the hypothesis of shared etiological processes in comorbid depressive and alcohol use disorders.