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Temporal stability of the action-perception cycle for postural control in a moving visual environment
T M Dijkstra1, G Schöner, C C Gielen
1Laboratory of Medical Physics and Biophysics, University of Nijmegen, The Netherlands.
Experimental Brain Research
|January 1, 1994
Summary
Human postural sway stabilizes with visual motion, revealing a strong action-perception coupling. This temporal stability is sensitive to visual distance, suggesting dynamic vision integration in postural control.
Area of Science:
- Human sensorimotor control
- Visual-vestibular interaction
- Biomechanics
Background:
- Postural sway in humans is influenced by visual motion.
- The action-perception cycle links visual input to motor output.
- Understanding this coupling is crucial for explaining human stability.
Purpose of the Study:
- To experimentally investigate the temporal relationship between visual motion and induced postural sway.
- To quantify the stability of the action-perception cycle.
- To determine how visual distance affects this coupling.
Main Methods:
- Utilized a novel setup with computer-generated 3D visual environments.
- Varied the mean distance to a sinusoidally moving wall.
- Analyzed relative phase fluctuations and relaxation times between visual and sway motion.
Main Results:
- Temporal stability of the action-perception cycle was well-defined and sensitive to coupling strength.
- Stability decreased as visual scene distance increased.
- Postural sway amplitude showed little decrease with distance, unlike predictions, suggesting active sway generation.
Conclusions:
- Postural control in moving visual environments involves dynamic coupling of vision, not just retinal slip minimization.
- The action-perception cycle's temporal stability is a key indicator of coupling strength.
- Human sway generation may involve active processes beyond simple visual feedback loops.