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Spatial pattern analysis reveals similarities between amphetamine conditioned and unconditioned locomotion.

L.H. Gold1, G.F. Koob, M.A. Geyer

  • 1Department of Neuropharmacology Research Institute of Scripps Clinic and Research Institute, La Jolla, CA 92093, USA.

Behavioural Pharmacology
|January 1, 1989
PubMed
Summary

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Repeated amphetamine (AMPH) injections in a specific environment create conditioned hyperactivity. This behavioral response, measured by locomotion and investigatory patterns, stabilizes and mimics the drug

Area of Science:

  • Neuroscience
  • Behavioral Pharmacology
  • Animal Behavior

Background:

  • Conditioned hyperactivity can develop after repeated drug exposure in a specific environment.
  • The precise nature of this conditioned behavioral response remains unclear.

Purpose of the Study:

  • To characterize the behavioral patterns of conditioned hyperactivity in rats.
  • To compare conditioned and unconditioned locomotor responses using detailed activity monitoring.

Main Methods:

  • Rats received daily saline or amphetamine (AMPH) injections before exposure to a testing environment (Behavioral Pattern Monitor - BPM).
  • Locomotor activity, rearing, and hole-poking were recorded over several days.
  • Transition matrices analyzed daily locomotor paths to assess pattern stabilization.

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Main Results:

  • Amphetamine-conditioned rats showed significantly increased locomotion, rearing, and hole-poking compared to saline controls.
  • Conditioned activity patterns on the final test day closely resembled the patterns from the last amphetamine exposure day.
  • The conditioned response was qualitatively similar to the unconditioned locomotor effect of amphetamine.

Conclusions:

  • Conditioned hyperactivity involves a stabilized, specific pattern of motor activity.
  • Environmental cues associated with drug administration become linked to this specific behavioral pattern.
  • The conditioned response mirrors the qualitative nature of the unconditioned drug effect.