Document Detail


On the nature of the vestibular control of arm-reaching movements during whole-body rotations.
MedLine Citation:
PMID:  15895218     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Recent studies report efficient vestibular control of goal-directed arm movements during body motion. This contribution tested whether this control relies (a) on an updating process in which vestibular signals are used to update the perceived egocentric position of surrounding objects when body orientation changes, or (b) on a sensorimotor process, i.e. a transfer function between vestibular input and the arm motor output that preserves hand trajectory in space despite body rotation. Both processes were separately and specifically adapted. We then compared the respective influences of the adapted processes on the vestibular control of arm-reaching movements. The rationale was that if a given process underlies a given behavior, any adaptive modification of this process should give rise to observable modification of the behavior. The updating adaptation adapted the matching between vestibular input and perceived body displacement in the surrounding world. The sensorimotor adaptation adapted the matching between vestibular input and the arm motor output necessary to keep the hand fixed in space during body rotation. Only the sensorimotor adaptation significantly altered the vestibular control of arm-reaching movements. Our results therefore suggest that during passive self-motion, the vestibular control of arm-reaching movements essentially derives from a sensorimotor process by which arm motor output is modified on-line to preserve hand trajectory in space despite body displacement. In contrast, the updating process maintaining up-to-date the egocentric representation of visual space seems to contribute little to generating the required arm compensation during body rotations.
Authors:
Jean-Pierre Bresciani; Gabriel M Gauthier; Jean-Louis Vercher; Jean Blouin
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-05-14
Journal Detail:
Title:  Experimental brain research     Volume:  164     ISSN:  0014-4819     ISO Abbreviation:  Exp Brain Res     Publication Date:  2005 Aug 
Date Detail:
Created Date:  2005-07-26     Completed Date:  2005-12-08     Revised Date:  2013-12-13    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  431-41     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Adaptation, Physiological / physiology
Adolescent
Adult
Arm / physiology*
Brain / physiology
Feedback / physiology
Humans
Movement / physiology*
Orientation / physiology*
Physical Stimulation
Postural Balance / physiology*
Proprioception / physiology
Rotation
Space Perception / physiology
Vestibule, Labyrinth / physiology*

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


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