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Related Experiment Videos

Impaired DRL 30 performance during amphetamine withdrawal.

Jayms D Peterson1, Marina E Wolf, Francis J White

  • 1Department of Neuroscience, Finch University of Health Sciences/The Chicago Medical School, 3333 Green Bay Road, North Chicago, IL 60064-3095, USA.

Behavioural Brain Research
|July 5, 2003
PubMed
Summary

Repeated amphetamine exposure increases impulsivity during withdrawal in rats. This suggests disrupted dopamine function in the medial prefrontal cortex (mPFC) may underlie drug relapse.

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Area of Science:

  • Neuroscience
  • Behavioral Science
  • Pharmacology

Background:

  • Repeated psychostimulant use can lead to impulsivity, contributing to drug addiction cycles.
  • Previous research indicated impaired medial prefrontal cortex (mPFC) dopamine (DA) function after amphetamine treatment.

Purpose of the Study:

  • To investigate the effects of repeated amphetamine administration on impulsivity and inhibitory control using a DRL operant conditioning task.
  • To assess the role of mPFC DA function in amphetamine-induced behavioral changes.

Main Methods:

  • Rats were trained on a differential reinforcement of low rates (DRL) 30s operant conditioning task.
  • Following training, rats received daily saline or amphetamine injections for 5 days.
  • Impulsivity was assessed during a 9-day withdrawal period after treatment cessation.

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Main Results:

  • Rats withdrawn from repeated amphetamine administration showed a significant increase in active hole nose pokes.
  • Training efficiency was significantly decreased in the amphetamine withdrawal group compared to controls.
  • These behavioral changes suggest heightened impulsivity during amphetamine withdrawal.

Conclusions:

  • Repeated amphetamine administration leads to increased impulsivity during withdrawal in rats.
  • This impulsivity is hypothesized to be linked to disrupted dopamine signaling within the medial prefrontal cortex (mPFC).
  • Findings contribute to understanding the neurobiological mechanisms of drug abstinence and relapse.