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Comment: gating effects and constraints on the central pattern generators for rhythmic movements

L M Jordan

    Canadian Journal of Physiology and Pharmacology
    |July 1, 1981
    PubMed
    Summary
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    This study reveals that rhythmic inhibition of limb motoneurons, involving Ia inhibitory interneurons, prevents proprioceptive disruption during locomotion. Renshaw cells may gate sensory inputs to motoneurons.

    Area of Science:

    • Neuroscience
    • Motor Control
    • Computational Biology

    Background:

    • Locomotion, respiration, and mastication involve complex neural control.
    • Afferent feedback influences motor output through motoneuron excitability.
    • Understanding premotoneuronal and motoneuron contributions is key to motor control.

    Purpose of the Study:

    • To compare neural mechanisms underlying phasic gain changes in afferent effects across different behaviors.
    • To investigate the role of inhibitory mechanisms in preventing proprioceptive disruption during locomotion.
    • To elucidate the function of Renshaw cell activity in motor pattern generation.

    Main Methods:

    • Comparative analysis of motoneuron membrane and premotoneuronal activity.
    • Electrophysiological recordings during locomotion.

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  • Pharmacological and lesion studies (implied).

    • Main Results:

    • An inhibitory mechanism protects limb motoneurons from proprioceptive input disruption during locomotion.
    • Ia inhibitory interneurons rhythmically inhibit both flexor and extensor motoneurons.
    • Rhythmic Renshaw cell activity during locomotion suggests a role in input gating.

    Conclusions:

    • Rhythmic inhibition is crucial for maintaining motor patterns against sensory interference.
    • Ia inhibitory interneurons and Renshaw cells are key components of motor rhythm generation and sensory gating.
    • These mechanisms contribute to the precise control of movement.