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Related Experiment Videos

Long-loop reflexes in the tranquilized monkey.

J D Cooke, M J Eastman

    Experimental Brain Research
    |April 21, 1977
    PubMed
    Summary
    This summary is machine-generated.

    This study investigated muscle responses to limb displacement in tranquilized monkeys, finding three distinct EMG activation periods similar to alert animals. These responses varied with background activity and limb position, offering insights into motor control mechanisms.

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    Area of Science:

    • Neuroscience
    • Motor Control
    • Primate Physiology

    Background:

    • Understanding the neural mechanisms underlying motor control is crucial.
    • Electromyography (EMG) provides insights into muscle activation patterns.
    • Primate models offer valuable insights into human motor systems.

    Purpose of the Study:

    • To characterize EMG responses to sudden forelimb displacement in tranquilized Cebus monkeys.
    • To compare these responses to those observed in alert animals.
    • To investigate the influence of background activity and limb position on these responses.

    Main Methods:

    • Monkeys were tranquilized with Atravet, a phenothiazine tranquilizer.
    • Forelimb displacements were induced using a servo-controlled torque motor.

    Related Experiment Videos

  • EMG activity in biceps and antagonist muscles was recorded.

    • Main Results:

    • Three distinct EMG activation periods (M1, M2, M3) were observed with latencies of ~25, 45, and 85 msec.
    • Responses increased with background muscle activity and suppressed antagonist activity.
    • M1 and M2 responses showed position dependence, influenced by preceding activity.

    Conclusions:

    • Tranquilization with Atravet preserves key EMG response characteristics to limb displacement.
    • The M1, M2, and M3 responses reflect distinct neural pathways involved in motor control.
    • Limb position and preceding muscle activity significantly modulate motor responses.