Document Detail

Acceleration feedback improves balancing against reflex delay.
MedLine Citation:
PMID:  23173196     Owner:  NLM     Status:  MEDLINE    
A model for human postural balance is considered in which the time-delayed feedback depends on position, velocity and acceleration (proportional-derivative-acceleration (PDA) feedback). It is shown that a PDA controller is equivalent to a predictive controller, in which the prediction is based on the most recent information of the state, but the control input is not involved into the prediction. A PDA controller is superior to the corresponding proportional-derivative controller in the sense that the PDA controller can stabilize systems with approximately 40 per cent larger feedback delays. The addition of a sensory dead zone to account for the finite thresholds for detection by sensory receptors results in highly intermittent, complex oscillations that are a typical feature of human postural sway.
Tamás Insperger; John Milton; Gábor Stépán
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of the Royal Society, Interface / the Royal Society     Volume:  10     ISSN:  1742-5662     ISO Abbreviation:  J R Soc Interface     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2012-11-22     Completed Date:  2013-05-01     Revised Date:  2014-02-14    
Medline Journal Info:
Nlm Unique ID:  101217269     Medline TA:  J R Soc Interface     Country:  England    
Other Details:
Languages:  eng     Pagination:  20120763     Citation Subset:  IM    
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MeSH Terms
Biomechanical Phenomena
Feedback, Sensory / physiology*
Models, Biological*
Postural Balance / physiology*
Reflex / physiology*

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

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