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d-Amphetamine induced changes in social interaction patterns.

E O Smith, L D Byrd

    Pharmacology, Biochemistry, and Behavior
    |January 1, 1985
    PubMed
    Summary
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    d-amphetamine significantly altered stumptail macaque behavior, increasing aggression towards younger and kin-related monkeys while decreasing it towards adults and non-kin. The drug also indirectly impacted social dynamics within the group.

    Area of Science:

    • Primatology
    • Neuropharmacology
    • Behavioral Science

    Background:

    • Social hierarchies and behavioral patterns are crucial in primate groups.
    • Understanding the impact of psychoactive substances on social behavior is vital for ecological and evolutionary studies.

    Purpose of the Study:

    • To investigate the behavioral effects of d-amphetamine in a social group of stumptail macaques.
    • To determine how d-amphetamine influences aggressive and affiliative behaviors within a group setting.
    • To examine indirect effects of the drug on non-treated individuals.

    Main Methods:

    • A group of stumptail macaques housed in a large outdoor enclosure were administered d-amphetamine.
    • Behavioral observations focused on aggressive and affiliative interactions before and after drug administration.

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  • Analysis differentiated effects based on age (adult vs. non-adult) and kinship (kin vs. non-kin).

    • Main Results:

    • d-Amphetamine administration led to increased aggression towards non-adults and decreased aggression towards adults in treated male macaques.
    • Aggression increased towards kin-related individuals and decreased towards non-kin in subjects with known genealogy.
    • Effects on affiliative behaviors were less consistent, with some individuals decreasing and others increasing affiliation towards non-adults.

    Conclusions:

    • d-Amphetamine substantially alters the behavior of treated individuals within a social group.
    • The drug can indirectly influence the social dynamics and behavior of non-treated members of the group.
    • These findings highlight the complex impact of psychotropic substances on social interactions and group structure in primates.