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Related Experiment Videos

Amphetamine: effects on defensive flight or avoidance in the rat.

S Mollenauer, M White, R Plotnik

    Pharmacology, Biochemistry, and Behavior
    |September 1, 1979
    PubMed
    Summary

    Amphetamine treatment caused rats to avoid neutral stimuli, with effects increasing at higher doses. This avoidance was independent of motor side effects like stereotypy.

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    Area of Science:

    • Neuroscience
    • Behavioral Pharmacology
    • Psychopharmacology

    Background:

    • Amphetamines are known psychostimulants with complex effects on behavior.
    • Previous research indicates amphetamines can alter responses to environmental stimuli.

    Purpose of the Study:

    • To investigate the specific effects of amphetamine on stimulus-driven approach and avoidance behaviors in rats.
    • To determine if amphetamine-induced avoidance is dose-dependent and distinct from motor side effects.

    Main Methods:

    • Rats were administered varying doses of amphetamine (1.75, 3.5, 7.0 mg/kg) or saline.
    • Behavioral responses to neutral stimuli (robot, rabbit) were recorded in an apparatus.
    • Time spent near vs. far from the stimulus was quantified.
    • Control conditions assessed motor stereotypy and general activity levels.

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    Main Results:

    • Amphetamine-treated rats significantly avoided stimuli compared to saline controls.
    • Avoidance behavior showed a dose-dependent relationship, increasing with higher amphetamine doses.
    • Higher doses induced stereotypy, but control experiments confirmed avoidance was not solely due to motor effects.

    Conclusions:

    • Amphetamine, at moderately high doses, induces avoidance of neutral stimuli in rats.
    • This avoidance is a specific behavioral effect, separate from amphetamine's impact on motor activity or stereotypy.
    • The findings highlight amphetamine's capacity to modify affective responses to environmental cues.