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Individual differences in locomotor activity and sensitization.

M S Hooks1, G H Jones, A D Smith

  • 1Department of Chemistry, Emory University, Atlanta, GA 30322.

Pharmacology, Biochemistry, and Behavior
|February 1, 1991
PubMed
Summary
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High responders (HR) to novelty showed greater locomotor activity with amphetamine (AMPH) and cocaine, but not scopolamine. Novelty response predicts drug sensitivity and sensitization, suggesting a common neural basis.

Area of Science:

  • Neuroscience
  • Behavioral Pharmacology
  • Psychopharmacology

Background:

  • Individual differences in response to novel environments are well-documented in rodents.
  • These differences may influence susceptibility to psychostimulant drugs.

Purpose of the Study:

  • To investigate if baseline locomotor activity in a novel environment predicts responses to psychostimulants.
  • To examine individual differences in tolerance and sensitization to amphetamine, cocaine, and scopolamine.

Main Methods:

  • Male rats were categorized as high (HR) or low (LR) responders based on novelty-induced locomotor activity.
  • Locomotor activity was monitored following repeated administration of amphetamine, cocaine, or scopolamine.
  • Tolerance and sensitization were assessed in HR and LR groups.

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Main Results:

  • HR rats exhibited significantly higher locomotor activity than LR rats across all tested drugs.
  • Both HR and LR rats developed similar tolerance rates to scopolamine.
  • HR rats displayed pronounced sensitization to amphetamine, correlating with their novelty response.

Conclusions:

  • An individual's response to novelty can predict their sensitivity to certain drug-induced locomotor effects.
  • Individual variations in novelty seeking and amphetamine sensitization may share common neural mechanisms.
  • These findings highlight the role of individual differences in predicting psychopharmacological outcomes.