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Related Experiment Videos

Visual destabilisation of posture in normal subjects.

L Yardley1, H Lerwill, M Hall

  • 1Medical Research Council Human Movement and Balance Unit, National Hospital, London, U.K.

Acta Oto-Laryngologica
|January 1, 1992
PubMed
Summary

This study introduces a simple method to assess vision reliance for balance. Vision reversal significantly impacts stability and correlates with motion sickness, revealing its crucial role in postural control and cognitive load.

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Area of Science:

  • Neuroscience
  • Human Physiology
  • Biomechanics

Background:

  • Postural control relies on integrating sensory information, primarily visual, vestibular, and proprioceptive inputs.
  • Assessing the specific contribution of vision to maintaining balance is crucial for understanding sensorimotor integration.

Purpose of the Study:

  • To evaluate a novel and straightforward method for quantifying reliance on vision for postural control.
  • To investigate the effects of visual input manipulation on balance and its relationship with motion sickness and cognitive load.

Main Methods:

  • Forty-one healthy subjects stood on foam to diminish proprioception.
  • Peripheral and central vision were reversed using head-mounted mirrors and prisms, respectively.
  • Balance was assessed via body sway, and motion sickness susceptibility and visuo-spatial memory were measured.

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Main Results:

  • Vision reversal induced significant instability in about half of the subjects, comparable to eye closure.
  • Sensitivity to vision reversal correlated positively with motion sickness susceptibility.
  • Balancing with reversed vision impaired visuo-spatial memory task performance.

Conclusions:

  • The developed method effectively assesses reliance on vision for postural control.
  • Visual input is critical for maintaining balance, and its disruption has cognitive consequences.
  • Coping with misleading visual information imposes demands on cortical spatial processing.