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Some visual influences on human postural equilibrium: binocular versus monocular fixation.
1Department of Otolaryngology, Washington University School of Medicine, St. Louis, MO 63110.
Perception & Psychophysics
|May 1, 1990
Summary
Vision significantly impacts postural equilibrium. Both ankle proprioception and binocular vision (viewing with two eyes) reduce body sway, even in darkness, suggesting complex visual-postural interactions.
Area of Science:
- Human physiology
- Neuroscience
- Biomechanics
Background:
- Postural equilibrium relies heavily on visual input.
- Traditional analysis focused on optical and retinal factors.
- Recent findings suggest differential effects of binocular vs. monocular fixation.
Purpose of the Study:
- To investigate the influence of visual field structure, ankle proprioception, and fixation type on postural sway.
- To determine if visual input's effect on posture is solely optical/retinal.
- To explore multimodal sensory integration in postural control.
Main Methods:
- Measured body's center of gravity sway during quiet standing.
- Manipulated visual conditions: darkness, limited LEDs, full visual field.
- Varied ankle proprioception via foot placement (side-by-side vs. heel-to-toe).
- Compared sway under binocular and monocular fixation conditions.
Main Results:
- Ankle proprioception significantly reduced body sway.
- Binocular fixation attenuated sway compared to monocular fixation.
- This effect of binocular fixation persisted even in complete darkness.
Conclusions:
- Visual influence on postural equilibrium is complex, involving multimodal sensory synergy.
- Ankle proprioception is a crucial factor in maintaining balance.
- A simple optical/retinal explanation for vision's role in posture is insufficient.