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A Protocol for Measuring Cue Reactivity in a Rat Model of Cocaine Use Disorder
07:51

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Published on: June 18, 2018

Negative reinforcement learning is affected in substance dependence.

Laetitia L Thompson1, Eric D Claus, Susan K Mikulich-Gilbertson

  • 1University of Colorado School of Medicine, Department of Psychiatry, Aurora, CO 80045, USA.

Drug and Alcohol Dependence
|November 15, 2011
PubMed
Summary
This summary is machine-generated.

Substance-dependent individuals show deficits in negative reinforcement learning, particularly in response to the magnitude of negative outcomes. This impaired learning may contribute to relapse, as individuals are less sensitive to the severity of adverse consequences.

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Area of Science:

  • Neuroscience
  • Psychology
  • Addiction Research

Background:

  • Negative reinforcement, escaping aversive outcomes, is crucial in substance dependence.
  • Understanding negative reinforcement learning in substance-dependent individuals (SDI) is limited.
  • Withdrawal symptoms may act as negative reinforcers, perpetuating substance use.

Purpose of the Study:

  • To examine reinforcement learning in SDI, focusing on negative reinforcement.
  • To compare negative reinforcement learning between SDI and controls.
  • To investigate the influence of reinforcer magnitude and frequency on learning.

Main Methods:

  • Modified Iowa Gambling Task to assess positive and negative reinforcement separately.
  • Compared 30 psychostimulant-dependent individuals with 28 community controls.
  • Decision-making task manipulated outcome magnitudes and frequencies, requiring action to avoid negative outcomes.

Main Results:

  • SDI demonstrated impaired learning to avoid negative outcomes compared to controls.
  • This deficit was primarily linked to the magnitude, not frequency, of negative feedback.
  • No significant differences were observed in approach behaviors related to positive reinforcement between groups.

Conclusions:

  • SDI exhibit a specific deficit in negative reinforcement learning.
  • Individuals with substance dependence are less sensitive to the magnitude of negative consequences.
  • This insensitivity to loss magnitude may contribute to relapse, suggesting withdrawal severity is a key driver.