Document Detail


Stimulus-dependent changes in the vestibular contribution to human postural control.
MedLine Citation:
PMID:  16467429     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Humans maintain stable stance in a wide variety of environments. This robust behavior is thought to involve sensory reweighting whereby the nervous system adjusts the relative contribution of sensory sources used to control stance depending on environmental conditions. Based on prior experimental and modeling results, we developed a specific quantitative representation of a sensory reweighting hypothesis that predicts that a given reduction in the contribution from one sensory system will be accompanied by a corresponding increase in the contribution from different sensory systems. The goal of this study was to test this sensory-reweighting hypothesis using measures that quantitatively assess the relative contributions of the proprioceptive and graviceptive (vestibular) systems to postural control during eyes-closed stance in different test conditions. Medial/lateral body sway was evoked by side-to-side rotation of the support surface (SS) while simultaneously delivering a pulsed galvanic vestibular stimulus (GVS) through electrodes behind the ears. A model-based interpretation of sway evoked by SS rotations provided estimates of the proprioceptive weighting factor, Wp, and showed that Wp declined with increasing SS amplitude. If the sensory-reweighting hypothesis is true, then the decline in Wp should be accompanied by a corresponding increase in Wp, the graviceptive weighting factor, and responses to the GVS should increase in proportion to the value of Wp derived from responses to SS rotations. Results were consistent with the predictions of the proposed sensory-reweighting hypothesis. GVS-evoked sway increased with increasing SS amplitude, and Wp measures derived from responses to GVS and from responses to SS rotations were highly correlated.
Authors:
Massimo Cenciarini; Robert J Peterka
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2006-02-08
Journal Detail:
Title:  Journal of neurophysiology     Volume:  95     ISSN:  0022-3077     ISO Abbreviation:  J. Neurophysiol.     Publication Date:  2006 May 
Date Detail:
Created Date:  2006-04-17     Completed Date:  2006-06-28     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  0375404     Medline TA:  J Neurophysiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2733-50     Citation Subset:  IM    
Affiliation:
Neurological Sciences Institute, Oregon Health & Science University, 505 NW 185th Ave., Beaverton, OR 97006, USA.
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MeSH Terms
Descriptor/Qualifier:
Adult
Biofeedback, Psychology
Dose-Response Relationship, Radiation
Electric Stimulation / methods
Female
Galvanic Skin Response / physiology
Habituation, Psychophysiologic
Humans
Male
Middle Aged
Models, Neurological
Movement / physiology
Postural Balance*
Posture / physiology*
Proprioception / physiology*
Time Factors
Vestibular Function Tests / methods
Vestibule, Labyrinth / physiology*,  radiation effects*
Grant Support
ID/Acronym/Agency:
AG-17960/AG/NIA NIH HHS; DC-01849/DC/NIDCD NIH HHS

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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