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Spatial working memory performance and fMRI activation interaction in abstinent adolescent marijuana users.

Claudia B Padula1, Alecia D Schweinsburg, Susan F Tapert

  • 1Veterans Affairs San Diego Healthcare System, San Diego, USA.

Psychology of Addictive Behaviors : Journal of the Society of Psychologists in Addictive Behaviors
|December 13, 2007
PubMed
Summary

Adolescent marijuana users show altered brain activity during memory tasks, even after abstinence. These neural differences suggest modified pathways despite normal task performance.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Addiction Research

Background:

  • Previous research indicates neural changes in adult marijuana users.
  • The persistence of these effects in adolescents after abstinence is not well understood.
  • Understanding adolescent brain response to marijuana use is crucial.

Purpose of the Study:

  • To investigate neural disruption and reorganization in adolescent marijuana users after 28 days of abstinence.
  • To examine Performance x Brain Response interactions during a spatial working memory task.
  • To determine if altered neural pathways are evident despite comparable behavioral performance.

Main Methods:

  • Recruitment of adolescent marijuana users (n=17) and controls (n=17) aged 16-18 years.
  • Collection of functional magnetic resonance imaging (fMRI) data after 28 days of monitored abstinence.

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  • Administration of a spatial working memory task during fMRI scanning.

    • Main Results:

    • Marijuana users exhibited significant Performance x Brain Response interactions in specific brain regions, including bilateral temporal lobes, left anterior cingulate, left parahippocampal gyrus, and right thalamus.
    • These neural differences were observed despite no significant differences in behavioral task performance between groups.
    • Altered brain responses suggest a distinct neural strategy employed by marijuana users.

    Conclusions:

    • Adolescent marijuana users display altered neural processing during a spatial working memory task, even after a period of abstinence.
    • These findings suggest that neural pathways are reorganized or disrupted, leading to different brain activation patterns.
    • The study highlights the potential for persistent neurobiological effects of marijuana use in adolescents, impacting cognitive function and brain response.