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Related Experiment Videos

Individual differences in amphetamine sensitization: dose-dependent effects.

M S Hooks1, G H Jones, D B Neill

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

Pharmacology, Biochemistry, and Behavior
|January 11, 1992
PubMed
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High and low locomotor responders in rats showed differential responses to d-amphetamine sulfate (AMPH). Locomotor activity and sensitization to AMPH were linked to novelty response, particularly at lower doses.

Area of Science:

  • Neuroscience
  • Behavioral Pharmacology
  • Animal Models

Background:

  • Individual differences in behavioral responses are common in animal studies.
  • Locomotor activity is a key behavioral measure influenced by various factors, including psychostimulants.
  • D-amphetamine sulfate (AMPH) is a widely used psychostimulant to study its effects on behavior.

Purpose of the Study:

  • To investigate the relationship between spontaneous locomotor activity in a novel environment and the behavioral response to d-amphetamine sulfate (AMPH) in rats.
  • To examine differences in locomotor activity and sensitization to AMPH between high (HR) and low (LR) responders.
  • To explore the role of specific brain regions, such as the nucleus accumbens (NACC) and anterior dorsal striatum (ADS), in mediating these responses.

Main Methods:

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  • Rats were screened for locomotor activity in a novel environment and categorized as HR or LR.
  • HR and LR rats received repeated systemic administration of varying doses of AMPH (0.0-1.5 mg/kg).
  • Intracranial infusions of AMPH were administered into the NACC and ADS in a separate experiment.

Main Results:

  • HR rats exhibited higher locomotor activity than LR rats following 0.5 and 1.0 mg/kg AMPH, with a correlation between novelty response and AMPH response.
  • HR rats showed pronounced sensitization to 1.0 mg/kg AMPH, while both groups developed similar sensitization to 0.5 mg/kg AMPH.
  • No significant differences in locomotor activity or sensitization were observed at the highest AMPH dose (1.5 mg/kg) or following intracranial infusions into NACC/ADS, though novelty response correlated with intracranial AMPH response.

Conclusions:

  • Individual differences in locomotor activity in novel environments predict behavioral responses and sensitization to certain doses of AMPH.
  • The relationship between novelty seeking and AMPH response suggests a common underlying neurobiological mechanism.
  • While systemic AMPH effects differ between HR and LR rats, direct NACC or ADS infusions may not fully capture these individual differences.