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Related Experiment Videos

Saccadic eye movements and body sway

K D White, R B Post, H W Leibowitz

    Science (New York, N.Y.)
    |May 9, 1980
    PubMed
    Summary

    Moving visual patterns affect balance differently. While surrounding motion increases body sway, eye movements (saccades) do not, suggesting postural control ignores visual feedback during saccades.

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    Area of Science:

    • Neuroscience
    • Biomechanics
    • Vision Science

    Background:

    • Postural stability relies on sensory feedback, including visual cues.
    • Moving visual environments can influence body sway and balance.
    • Saccades, rapid eye movements, are known to suppress visual perception.

    Purpose of the Study:

    • To investigate how different types of moving retinal images affect postural stability.
    • To determine if visual feedback during voluntary saccades influences postural control.
    • To explore the relationship between saccadic suppression, space constancy, and postural responses.

    Main Methods:

    • Participants stood on a stable surface under different visual conditions.
    • Retinal image motion was induced by either a moving surrounding pattern during fixation or by voluntary saccades.
    • Body sway was measured using motion sensors.

    Main Results:

    • A moving surrounding pattern presented during steady fixation significantly increased body sway.
    • Similar retinal image motion generated by voluntary saccades did not increase body sway.
    • These findings indicate that the postural control system does not utilize visual feedback during saccades.

    Conclusions:

    • The postural control system exhibits differential responses to visual motion depending on the context (fixation vs. saccade).
    • Mechanisms akin to saccadic suppression likely prevent visual feedback from influencing posture during rapid eye movements.
    • Understanding these principles is crucial for explaining space constancy and visual-motor integration.

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