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Experimental Methods to Study Human Postural Control
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Voluntarily controlled but not merely observed visual feedback affects postural sway.

Shu Imaizumi1,2, Tomohisa Asai3, Kentaro Hiromitsu4

  • 1Graduate School of Arts and Sciences, The University of Tokyo, Tokyo, Japan.

Peerj
|April 24, 2018
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Summary

Voluntarily controlling visual feedback can worsen postural sway, unlike merely observing it. This suggests actively managed visual input integrates into the body

Keywords:
BiofeedbackIntentionPostural controlSense of controlStabilometryVisuomotor

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Area of Science:

  • Human motor control
  • Neuroscience
  • Biomechanics

Background:

  • Human standing posture relies on multisensory information, including vision.
  • Visual feedback can stabilize posture, but the impact of actively controlling this feedback is not well understood.

Purpose of the Study:

  • To investigate how voluntarily controlling visual feedback affects postural sway compared to merely observing it.
  • To determine if intentional manipulation of visual feedback influences postural control in healthy adults.

Main Methods:

  • Healthy adults performed quiet standing tasks under different visual feedback conditions (gain, flipping).
  • Participants either voluntarily controlled the visual feedback to minimize sway or merely observed it.
  • Postural sway was measured, and the sense of control was assessed.

Main Results:

  • Magnified and flipped visual feedback increased postural sway significantly in the voluntary-control group only.
  • A greater sense of control over visual feedback correlated positively with increased postural sway.
  • Merely observing visual feedback did not lead to increased sway.

Conclusions:

  • Voluntarily controlled visual feedback appears to be integrated into the postural control system.
  • Active engagement with visual feedback, rather than passive observation, can alter postural sway.
  • The findings highlight the distinct roles of active versus passive visual input in maintaining upright stance.