Document Detail

Delayed visual feedback reveals distinct time scales in balance control.
MedLine Citation:
PMID:  19444950     Owner:  NLM     Status:  MEDLINE    
We performed an experiment in which we challenged postural stability in 12 healthy subjects by providing artificial delayed visual feedback. A monitor at eye-height presented subjects with a visual representation of the location of their center-of-pressure (COP) and they were instructed to position their COP as accurately as possible on a small target. Visual feedback of the COP was displayed either in real-time, or delayed by 250, 500, 750, or 1000 ms. In a control condition, no visual feedback was provided. As expected, stability increased during real-time visual feedback compared to when feedback was absent. To identify time scales at which postural control during quiet stance takes place we sought to distinguish between different frequencies. Low frequencies, i.e. slow components of postural sway, showed a monotonic increase in sway amplitude with increasing delay, whereas high frequencies, i.e. fast components of postural sway, showed significantly reduced sway amplitude for delays of 500-750 ms compared to the other delay conditions. Low- and high-frequency components of postural sway thus exhibited differential susceptibility to artificial delays, thereby supporting the notion of postural control taking place on two distinct time scales.
Maarten R C van den Heuvel; Ramesh Balasubramaniam; Andreas Daffertshofer; André Longtin; Peter J Beek
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Neuroscience letters     Volume:  452     ISSN:  0304-3940     ISO Abbreviation:  Neurosci. Lett.     Publication Date:  2009 Mar 
Date Detail:
Created Date:  2009-05-13     Completed Date:  2009-06-11     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7600130     Medline TA:  Neurosci Lett     Country:  Ireland    
Other Details:
Languages:  eng     Pagination:  37-41     Citation Subset:  IM    
Research Institute MOVE, VU University Amsterdam, Amsterdam, The Netherlands.
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MeSH Terms
Feedback / physiology*
Photic Stimulation / methods
Postural Balance / physiology*
Time Factors
Visual Perception / physiology*

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