Sensory re-weighting in human postural control during moving-scene perturbations

The aim of the current study was to further investigate a recently proposed "sensory re-weighting" hypothesis, by evoking anterior-posterior (AP) body sway using visual stimuli during sway-referencing of the support surface. Twelve healthy adults participated in this study. Subjects stood...

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Bibliographic Details
Published in:Experimental brain research 2005-11, Vol.167 (2), p.260-267
Main Authors: MAHBOOBIN, Arash, LOUGHLIN, Patrick J, REDFERN, Mark S, SPARTO, Patrick J
Format: Article
Language:English
Subjects:
Adult
Analysis of Variance
Applied physiology
Biological and medical sciences
Female
Fundamental and applied biological sciences. Psychology
Human physiology applied to population studies and life conditions. Human ecophysiology
Humans
Male
Medical sciences
Motion Perception - physiology
Motor control and motor pathways. Reflexes. Control centers of vegetative functions. Vestibular system and equilibration
Photic Stimulation - methods
Postural Balance - physiology
Posture - physiology
Proprioception - physiology
Time Factors
Transports. Aerospace. Diving. Altitude
Vertebrates: nervous system and sense organs
Vision, Ocular - physiology
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Summary:The aim of the current study was to further investigate a recently proposed "sensory re-weighting" hypothesis, by evoking anterior-posterior (AP) body sway using visual stimuli during sway-referencing of the support surface. Twelve healthy adults participated in this study. Subjects stood on the platform while looking at a visual scene that encompassed the full horizontal field of view. A sequence of scene movements was presented to the subjects consisting of multiple visual push/pull perturbations; in between the first two push/pull sequences, the scene either moved randomly or was stationary. The peak-squared velocity of AP center-of-pressure (COP) was computed within a 6 s window following each push and pull. The peak-squared velocity was lowest for the push/pull sequence immediately following the random moving scene. These results are consistent with the sensory re-weighting hypothesis, wherein the sensory integration process reduced the contribution of visual sensory input during the random moving scene interval. We also found evidence of habituation to moving scene perturbations with repeated exposure.
ISSN:0014-4819
1432-1106
DOI:10.1007/s00221-005-0053-7