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Reduced neural functional connectivity during working memory performance in methamphetamine use disorder.

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Individuals with methamphetamine use disorder (MUD) show poorer working memory performance and disrupted brain network connectivity during early abstinence. These findings suggest altered neural dynamics contribute to cognitive deficits in MUD patients undergoing treatment.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Addiction Research

Background:

  • Methamphetamine Use Disorder (MUD) is a significant global health issue.
  • Cognitive difficulties, especially in executive functions, are common during early abstinence from methamphetamine.
  • These cognitive deficits can impede treatment engagement and recovery for individuals with MUD.

Purpose of the Study:

  • To investigate brain activation and network connectivity in individuals with MUD during early abstinence.
  • To compare neural functioning during a working memory task between individuals with MUD and healthy controls.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to assess brain activity and network properties.
  • Participants included individuals with MUD (n=30) and healthy controls (HC, n=33) in early abstinence (3-11 days).
  • An N-back working memory task at two difficulty levels (1-back and 2-back) was administered.

Main Results:

  • The MUD group demonstrated poorer performance on the N-back task compared to the HC group.
  • No significant differences in task-related brain activation were observed between groups.
  • The MUD group exhibited reduced functional network connectivity, longer path lengths, and lower clustering, indicating disrupted network topology.

Conclusions:

  • Individuals with MUD in early abstinence show significant alterations in brain network connectivity and topology.
  • These network disruptions may underlie the observed cognitive deficits, particularly in executive functions.
  • Findings suggest a decoupling in neural network dynamics contributing to impaired cognition during early MUD recovery.