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Aggression increase and water competition decrease in squirrel monkeys given physostigmine injections

G S Thomas, D J Caccamise, D L Clark

    Pharmacology, Biochemistry, and Behavior
    |June 1, 1978
    PubMed
    Summary
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    Physostigmine sulfate in squirrel monkeys increased aggressive behaviors but decreased drinking and motor activity. Non-drugged partners of drugged monkeys showed improved water competition, indicating complex drug effects on social dominance.

    Area of Science:

    • Neuroscience
    • Primate Behavior
    • Pharmacology

    Background:

    • Social dominance is crucial in primate hierarchies.
    • Understanding drug effects on social interactions is important for behavioral neuroscience.
    • Physostigmine is a reversible cholinesterase inhibitor with known effects on cognition and behavior.

    Purpose of the Study:

    • To investigate the effects of physostigmine sulfate on social dominance in squirrel monkeys (Samiri sciureus).
    • To assess how physostigmine influences aggressive responses and water competition.
    • To examine the impact of unilateral drug administration on social dynamics.

    Main Methods:

    • Six adult squirrel monkeys were paired for water competition tasks.
    • Dominance was measured by aggressive responses and water acquisition metrics (latency, duration).

    Related Experiment Videos

  • Monkeys received control, saline, or varying doses of physostigmine sulfate (6.25, 12.5, 25.0 µg/kg), with only one partner drugged per trial.

    • Main Results:

    • A significant increase in aggressive responses was observed at the 12.5 µg/kg physostigmine dose.
    • Drinking duration and general motor activity decreased with increasing physostigmine dosage.
    • Non-drugged partners of drugged monkeys exhibited faster drinking acquisition and increased consumption at higher physostigmine doses.

    Conclusions:

    • Physostigmine sulfate differentially affects social dominance in squirrel monkeys, increasing aggression while impairing individual performance.
    • The study highlights complex pharmacological influences on social hierarchies and inter-individual behavior.
    • Unilateral drug administration can alter the performance and social standing of non-drugged individuals.