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Limbic activation during cue-induced cocaine craving

A R Childress1, P D Mozley, W McElgin

  • 1Addiction Treatment Research Center, Department of Psychiatry, University of Pennsylvania School of Medicine, Philadelphia 19104, USA. childress@research.trc.upenn.edu

The American Journal of Psychiatry
|January 19, 1999
PubMed
Summary

Cocaine craving in humans activates the limbic system, specifically the amygdala and anterior cingulate. This brain activation pattern was observed during exposure to cocaine-related cues in detoxified cocaine users.

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Area of Science:

  • Neuroscience
  • Addiction Research
  • Brain Imaging

Background:

  • Cocaine cues trigger limbic system activation in animals and craving in humans.
  • Understanding the neural basis of cue-induced craving is crucial for addiction treatment.

Purpose of the Study:

  • To investigate limbic system activation during cue-induced cocaine craving in humans.
  • To differentiate brain responses between cocaine users and non-users when exposed to drug-related stimuli.

Main Methods:

  • Positron emission tomography (PET) was used to measure regional cerebral blood flow (CBF).
  • 14 detoxified male cocaine users and 6 cocaine-naive controls were studied.
  • Participants were exposed to cocaine-related videos, non-drug-related videos, and resting conditions.

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Main Results:

  • Cocaine users exhibited increased limbic CBF (amygdala, anterior cingulate) and decreased basal ganglia CBF during cocaine cue exposure compared to non-drug cues.
  • This pattern of limbic activation was specific to cocaine users and not observed in controls.
  • No significant group differences were found in comparison brain regions like the dorsolateral prefrontal cortex or cerebellum.

Conclusions:

  • Limbic activation is a key neural component of cue-induced cocaine craving.
  • This limbic involvement in craving may extend to other substances and natural rewards.