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Related Experiment Videos

Suppression of visually evoked postural responses.

A M Bronstein

    Experimental Brain Research
    |January 1, 1986
    PubMed
    Summary

    Visually evoked postural responses (VEPR) are initially dominant in maintaining balance when sensory information conflicts. Adaptation allows other senses to take over, reducing reliance on vision for sway control.

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    Area of Science:

    • Neuroscience
    • Human motor control
    • Sensory integration

    Background:

    • Postural control relies on integrating visual, vestibular, and proprioceptive information.
    • The brain must adapt to conflicting sensory inputs to maintain balance.

    Purpose of the Study:

    • To investigate the role of vision in postural control during sensory conflict.
    • To examine the adaptive mechanisms underlying visually evoked postural responses (VEPR).

    Main Methods:

    • Normal subjects and patients with sensory deficits stood on a force platform within a moving room.
    • Visually evoked postural responses (VEPR) were measured during repeated room displacements.
    • Proprioceptive and vestibular function were assessed in patient groups.

    Main Results:

    • Normal subjects showed an initial VEPR followed by habituation with repeated stimuli.
    • VEPR habituation required intact proprioception from lower limbs.
    • Patients lacking proprioception exhibited enhanced, unsuppressible VEPR.
    • Patients with absent vestibular function showed normal VEPR.

    Conclusions:

    • Vision is initially dominant in sway control when sensory cues conflict.
    • Proprioception is crucial for adapting and suppressing visually evoked postural responses.
    • Adaptive processes can re-weight sensory hierarchies for effective balance control.

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