Document Detail

Postural hand synergies for tool use.
MedLine Citation:
PMID:  9822764     Owner:  NLM     Status:  MEDLINE    
Subjects were asked to shape the right hand as if to grasp and use a large number of familiar objects. The chosen objects typically are held with a variety of grips, including "precision" and "power" grips. Static hand posture was measured by recording the angular position of 15 joint angles of the fingers and of the thumb. Although subjects adopted distinct hand shapes for the various objects, the joint angles of the digits did not vary independently. Principal components analysis showed that the first two components could account for >80% of the variance, implying a substantial reduction from the 15 degrees of freedom that were recorded. However, even though they were small, higher-order (more than three) principal components did not represent random variability but instead provided additional information about the object. These results suggest that the control of hand posture involves a few postural synergies, regulating the general shape of the hand, coupled with a finer control mechanism providing for small, subtle adjustments. Because the postural synergies did not coincide with grip taxonomies, the results suggest that hand posture may be regulated independently from the control of the contact forces that are used to grasp an object.
M Santello; M Flanders; J F Soechting
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The Journal of neuroscience : the official journal of the Society for Neuroscience     Volume:  18     ISSN:  0270-6474     ISO Abbreviation:  J. Neurosci.     Publication Date:  1998 Dec 
Date Detail:
Created Date:  1998-12-18     Completed Date:  1998-12-18     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8102140     Medline TA:  J Neurosci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  10105-15     Citation Subset:  IM; S    
Neuroscience Department, University of Minnesota, Minneapolis, Minnesota 55455, USA.
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MeSH Terms
Feedback / physiology
Fingers / physiology*
Hand Strength / physiology*
Movement / physiology*
Posture / physiology*
Grant Support

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

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