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Altered Reward Processing System in Internet Gaming Disorder.

Syeda Raiha1,2, Guochun Yang1,2, Lingxiao Wang3,4

  • 1Key Laboratory of Behavioral Science, Institute of Psychology, Chinese Academy of Sciences, Beijing, China.

Frontiers in Psychiatry
|December 21, 2020
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Summary

Internet gaming disorder (IGD) impairs reward processing, showing steeper delay discounting and riskier choices. Neural responses during reward anticipation and outcome evaluation are altered in individuals with IGD.

Keywords:
ERPaddictionfeedback-related negativitygaming addictionimpulsivityinternet gamingreward processingstimulus-preceding negativity

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Area of Science:

  • Neuroscience
  • Psychology
  • Addiction Research

Background:

  • Addiction is linked to reward processing system dysfunction.
  • Specific reward processing deficits in internet gaming disorder (IGD) are not well understood.
  • Impulsivity and risk-taking in IGD lack consistent findings.

Purpose of the Study:

  • To investigate behavioral and electrophysiological responses across reward processing stages in individuals with IGD.
  • To compare reward processing between individuals with IGD and healthy controls (HCs).
  • To explore the relationship between impulsivity and reward sensitivity in IGD.

Main Methods:

  • Utilized a delayed discounting task and simple gambling tasks.
  • Measured behavioral responses (choice behavior, delay discounting).
  • Recorded event-related potentials (ERPs), including stimulus-preceding negativity (SPN) and feedback-related negativity (FRN).

Main Results:

  • IGD group showed steeper delay discounting and more risky choices than HCs.
  • IGDs displayed similar SPN amplitudes for large and small reward choices during anticipation, unlike HCs.
  • IGDs exhibited a blunted FRN response to losses versus gains during outcome evaluation.

Conclusions:

  • Individuals with IGD demonstrate impairments in multiple stages of reward processing.
  • Altered neural mechanisms underlie reward anticipation and outcome evaluation in IGD.
  • A negative correlation between impulsivity and reward sensitivity was observed during the anticipation stage only.