| Effects of human arm impedance on dynamics learning and generalization. | |
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MedLine Citation:
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PMID: 19357340 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Previous studies have demonstrated anisotropic patterns of hand impedance under static conditions and during movement. Here we show that the pattern of kinematic error observed in studies of dynamics learning is associated with this anisotropic impedance pattern. We also show that the magnitude of kinematic error associated with this anisotropy dictates the amount of motor learning and, consequently, the extent to which dynamics learning generalizes. Subjects were trained to reach to visual targets while holding a robotic device that applied forces during movement. On infrequent trials, the load was removed and the resulting kinematic error was measured. We found a strong correlation between the pattern of kinematic error and the anisotropic pattern of hand stiffness. In a second experiment subjects were trained under force-field conditions to move in two directions: one in which the dynamic perturbation was in the direction of maximum arm impedance and the associated kinematic error was low and another in which the perturbation was in the direction of low impedance where kinematic error was high. Generalization of learning was assessed in a reference direction that lay intermediate to the two training directions. We found that transfer of learning was greater when training occurred in the direction associated with the larger kinematic error. This suggests that the anisotropic patterns of impedance and kinematic error determine the magnitude of dynamics learning and the extent to which it generalizes. |
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Authors:
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Mohammad Darainy; Andrew A G Mattar; David J Ostry |
Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't Date: 2009-04-08 |
Journal Detail:
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Title: Journal of neurophysiology Volume: 101 ISSN: 0022-3077 ISO Abbreviation: J. Neurophysiol. Publication Date: 2009 Jun |
Date Detail:
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Created Date: 2009-05-27 Completed Date: 2009-08-03 Revised Date: 2010-09-27 |
Medline Journal Info:
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Nlm Unique ID: 0375404 Medline TA: J Neurophysiol Country: United States |
Other Details:
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Languages: eng Pagination: 3158-68 Citation Subset: IM |
Affiliation:
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Department of Psychology, McGill University, Montreal, Quebec, Canada H3A 1B1. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adaptation, Physiological
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physiology* Adolescent Adult Analysis of Variance Arm / innervation, physiology* Attention / physiology Biomechanics Generalization (Psychology) / physiology* Humans Learning / physiology* Movement Nonlinear Dynamics* Psychomotor Performance / physiology Young Adult |
| Grant Support | |
ID/Acronym/Agency:
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HD-48924/HD/NICHD NIH HHS |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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