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Related Experiment Videos

Spinal motor preparation in humans.

J S Frank

    Electroencephalography and Clinical Neurophysiology
    |April 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    Preparatory set influences reflex excitability before voluntary movement. The timing of reflex changes depends on anticipation levels, not just movement onset.

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    Area of Science:

    • Neuroscience
    • Motor Control
    • Human Physiology

    Background:

    • Voluntary movement initiation involves complex neural processes.
    • The role of preparatory set in modulating spinal reflexes is not fully understood.

    Purpose of the Study:

    • To investigate how preparatory set affects monosynaptic reflex excitability before voluntary movement.
    • To determine if reflex modulation is time-locked to movement onset or influenced by anticipation.

    Main Methods:

    • Six subjects performed three tasks with varying preparatory set levels (choice reaction-time, simple reaction-time, coincidence-timing).
    • Ankle plantarflexion was the voluntary response.
    • H reflexes in the soleus muscle were measured preceding voluntary contraction to assess monosynaptic reflex excitability.

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    Main Results:

    • All tasks showed initial depression followed by facilitation of H reflex amplitude.
    • Reflex facilitation onset varied, occurring earlier in the coincidence-timing task compared to others.
    • Facilitation onset was not consistently time-locked to voluntary muscle contraction onset.

    Conclusions:

    • Modulation of monosynaptic reflex excitability is controlled by the subject's preparatory set.
    • Reflex modulation is a distinct stage in voluntary movement organization, not solely dependent on movement initiation timing.