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Related Experiment Video

Updated: Jun 10, 2026

Brain Morphology of Cannabis Users With or Without Psychosis: A Pilot MRI Study
07:30

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Published on: August 18, 2020

Chronic cannabis users show altered neurophysiological functioning on Stroop task conflict resolution.

Robert A Battisti1, Steven Roodenrys, Stuart J Johnstone

  • 1School of Psychology, University of Wollongong, Wollongong, Australia. robert.battisti@sydney.edu.au

Psychopharmacology
|August 20, 2010
PubMed
Summary
This summary is machine-generated.

Chronic cannabis use impairs conflict resolution abilities, leading to more errors in demanding tasks. Early onset of cannabis use predicts poorer performance, suggesting long-term cognitive effects.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Addiction Research

Background:

  • Chronic cannabis use is linked to cognitive deficits, particularly memory impairments.
  • Cannabis affects brain structures sensitive to cannabinoids.
  • Conflict monitoring and resolution processes may be impacted by long-term cannabis use.

Purpose of the Study:

  • To investigate conflict resolution in chronic cannabis users using a Stroop task variant.
  • To assess the ability to inhibit automatic responses and activate difficult naming responses.

Main Methods:

  • Compared event-related brain potentials in 21 cannabis users and 19 controls during a discrete trial Stroop colour-naming task.
  • Assessed performance on neutral, congruent, and incongruent trials in an unintoxicated state.

Main Results:

  • Cannabis users made more errors on incongruent trials, unlike controls.
  • Earlier age of cannabis onset predicted worse performance on incongruent trials.
  • Users exhibited altered brain activity related to conflict resolution and neurophysiological-behavioral relationships.

Conclusions:

  • Chronic cannabis use may impair the brain's conflict resolution capabilities.
  • Findings suggest implications for substance misuse and maintaining abstinence.
  • Cognitive control deficits may persist even when not acutely intoxicated.