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Related Experiment Videos

Addiction changes orbitofrontal gyrus function: involvement in response inhibition.

R Z Goldstein1, N D Volkow, G J Wang

  • 1Brookhaven National Laboratory, Medical Research, Bldg. 490, 30 Bell Ave, Upton, NY 11973, USA.

Neuroreport
|August 10, 2001
PubMed
Summary
This summary is machine-generated.

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Substance abuse alters brain function. In cocaine addicts and alcoholics, higher orbitofrontal gyrus (OFG) activation correlated with better Stroop task performance, unlike controls, suggesting addiction reverses OFG

Area of Science:

  • Neuroscience
  • Addiction Research
  • Cognitive Psychology

Background:

  • Substance use disorders are linked to altered brain function, particularly in prefrontal regions involved in executive control.
  • The Stroop task is a validated measure of inhibitory control and cognitive flexibility.

Purpose of the Study:

  • To investigate the relationship between prefrontal glucose metabolism and inhibitory control in individuals with cocaine or alcohol addiction compared to controls.
  • To determine if addiction alters the functional role of the orbitofrontal gyrus (OFG) in response inhibition.

Main Methods:

  • Utilized the Stroop task to assess response inhibition.
  • Measured relative glucose metabolism in prefrontal brain regions using neuroimaging techniques.
  • Compared findings across three groups: cocaine addicts, alcoholics, and healthy controls (n=17 per group).

Related Experiment Videos

Main Results:

  • In substance abusers (cocaine and alcohol), increased orbitofrontal gyrus (OFG) activation was associated with better performance on the Stroop task (lower conflict, higher score; r = 0.32, p < 0.05).
  • In controls, increased OFG activation was associated with poorer performance on the Stroop task (higher conflict, lower score; r = -0.42, p < 0.05).

Conclusions:

  • The findings suggest a reversal in the role of the OFG in cognitive control as a function of addiction.
  • Baseline relative activation of the OFG is associated with differential performance on inhibitory control tasks in substance abusers versus controls.