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Environment-specific conditioning and sensitization with (+)-amphetamine.

E J Mazurski, R J Beninger

    Pharmacology, Biochemistry, and Behavior
    |May 1, 1987
    PubMed
    Summary
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    Environmental learning influences drug effects. This study shows that (+)-amphetamine (AMPH) conditioning creates environment-specific behavioral changes, while sensitization effects differ, suggesting distinct processes.

    Area of Science:

    • Neuroscience
    • Behavioral Pharmacology
    • Psychopharmacology

    Background:

    • Learning and environmental factors significantly modulate behavioral responses to pharmacological treatments.
    • Understanding the interplay between environmental cues and drug effects is crucial for predicting treatment outcomes.
    • (+)-amphetamine (AMPH) is a stimulant with well-documented behavioral effects, making it a suitable model for studying learning-related phenomena.

    Purpose of the Study:

    • To investigate the environmental control of sensitization and conditioning of stimulant effects induced by (+)-amphetamine (AMPH) in rats.
    • To determine if sensitization and conditioning are distinct phenomena with different behavioral manifestations and time courses.
    • To assess the role of environmental context in the development of drug-induced behavioral changes.

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    Main Methods:

    • Two experiments were conducted using rats, involving habituation to activity chambers.
    • Rats received paired or unpaired injections of (+)-amphetamine (AMPH) and saline, combined with environmental exposure.
    • Behavioral responses, including vertical and horizontal activity, were measured during test sessions following specific injection and environmental conditions.

    Main Results:

    • During pairing sessions, AMPH-treated rats exhibited increased vertical activity compared to controls.
    • Environment-specific conditioning was demonstrated by significant group differences in vertical activity during the saline test session.
    • Sensitization was not observed in vertical activity, but horizontal activity showed significant differences in the AMPH test session, suggesting dissociation.

    Conclusions:

    • (+)-amphetamine (AMPH)-induced sensitization and conditioning can be behaviorally dissociated.
    • These two phenomena may not follow the same temporal progression.
    • Environmental context plays a critical role in the development of drug-specific behavioral conditioning.