Document Detail

Is the velocity-curvature relationship disrupted in apraxic patients?
MedLine Citation:
PMID:  14561918     Owner:  NLM     Status:  MEDLINE    
Velocity and curvature of human movements are linked by a proportionality relationship (power-law) whose origin has been attributed either to functional properties of cortical areas or to peripheral constraints. 3D movements made by apraxic patients show a time-shift between velocity and curvature which has been considered as a disruption of the power-law, supporting the central hypothesis. We analysed the power-law in 2D drawing-like movements in healthy subjects and apraxic patients (correlation and cross-correlation analyses). The power-law remained preserved in apraxic patients, suggesting that the velocity-curvature relationship is not globally disrupted and thus that the power-law cannot be only attributed to central planning mechanisms in those associative brain areas injured in apraxic patients.
S Jacobs; S Hanneton; S Heude; A Roby-Brami
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Publication Detail:
Type:  Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Neuroreport     Volume:  14     ISSN:  0959-4965     ISO Abbreviation:  Neuroreport     Publication Date:  2003 Oct 
Date Detail:
Created Date:  2003-10-16     Completed Date:  2004-01-05     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9100935     Medline TA:  Neuroreport     Country:  England    
Other Details:
Languages:  eng     Pagination:  1907-11     Citation Subset:  IM    
CNRS UMR 8119. 45, rue des Saints Pères, 75006 Paris, France.
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MeSH Terms
Apraxias / psychology*
Form Perception / physiology
Middle Aged
Motion Perception / physiology*

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

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