Document Detail

Control of hand shaping in response to object shape perturbation.
MedLine Citation:
PMID:  17256167     Owner:  NLM     Status:  MEDLINE    
This study assessed how hand shaping responds to a perturbation of object shape. In blocked trials (80% of total), subjects were instructed to reach, to grasp and lift a concave or a convex object. In perturbed trials (20% of total), a rotating device allowed for the rapid change from the concave to the convex object or vice versa. In this situation subjects grasped the last presented object. Flexion/extension at the metacarpal-phalangeal and proximal interphalangeal joints of all digits was measured by resistive sensors embedded in a glove. In the blocked condition we found that most joints of the fingers were modulated by the type of the to-be-grasped object during the reach. When object shape was perturbed, reach duration was longer and angular excursion of all fingers differed with respect to blocked trials. For the 'convex --> concave' perturbation, a greater degree of finger extension was found than during the blocked 'concave' trials. In contrast, for the 'concave --> convex' perturbation, fingers were more flexed than for the blocked 'convex' trials. The thumb reacted to the perturbation showing a similar pattern (i.e., over-flexion with respect to the blocked trials) regardless the 'direction' of the perturbation. The present results suggest that applying an object shape perturbation during a reach-to-grasp action determines a reorganization of all digits. This pattern is suggestive of a control strategy, which assigns to opposing digits different roles.
Caterina Ansuini; Marco Santello; Federico Tubaldi; Stefano Massaccesi; Umberto Castiello
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-01-26
Journal Detail:
Title:  Experimental brain research     Volume:  180     ISSN:  0014-4819     ISO Abbreviation:  Exp Brain Res     Publication Date:  2007 Jun 
Date Detail:
Created Date:  2007-06-04     Completed Date:  2007-10-12     Revised Date:  2013-12-13    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  85-96     Citation Subset:  IM    
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MeSH Terms
Analysis of Variance
Finger Joint / innervation
Form Perception*
Hand Strength / physiology*
Psychomotor Performance / physiology*
Reaction Time / physiology
Statistics as Topic
Task Performance and Analysis
Touch / physiology*

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