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https://hdl.handle.net/2440/3065
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Type: | Journal article |
Title: | Hemispheric differences in the relationship between corticomotor excitability changes following a fine-motor task and motor learning |
Author: | Garry, M. Kamen, G. Nordstrom, M. |
Citation: | Journal of Neurophysiology, 2004; 91(4):1570-1578 |
Publisher: | Amer Physiological Soc |
Issue Date: | 2004 |
ISSN: | 0022-3077 1522-1598 |
Statement of Responsibility: | Michael I. Garry, Gary Kamen and Michael A. Nordstrom |
Abstract: | Motor performance induces a postexercise increase in corticomotor excitability that may be associated with motor learning. We investigated whether there are hemispheric differences in the extent and/or time course of changes in corticomotor excitability following a manipulation task (Purdue pegboard) and their relationship with motor performance. Single- and paired-pulse (3 ms) transcranial magnetic stimulation (TMS) was used to assess task-induced facilitation of the muscle evoked potential (MEP) and intracortical inhibition (ICI) for three intrinsic hand muscles acting on digits 1, 2, and 5. Fifteen right-handed subjects performed three 30-s pegboard trials with left or right hand in separate sessions. TMS was applied to contralateral motor cortex before and after performance. Number of pegs placed was higher with the right hand, and performance improved (motor learning) with both hands over the three trials. MEP facilitation following performance was short-lasting (<15 min), selective for muscles engaged in gripping the pegs, and of similar magnitude in left and right hands. ICI was reduced immediately following performance with the right hand, but not the left. The extent of MEP facilitation was positively correlated with motor learning for the right hand only. We conclude that the pegboard task induces a selective, short-lasting change in excitability of corticospinal neurons controlling intrinsic hand muscles engaged in the task. Only left hemisphere changes were related to motor learning. This asymmetry may reflect different behavioral strategies for performance improvement with left and right upper limb in this task or hemispheric differences in the control of skilled hand movements. |
Keywords: | Muscle, Skeletal Motor Cortex Humans Electromyography Analysis of Variance Regression Analysis Electric Stimulation Learning Psychomotor Performance Motor Skills Dose-Response Relationship, Radiation Evoked Potentials, Motor Magnetics Adolescent Adult Female Male Functional Laterality Inhibition, Psychological |
Description: | Copyright © 2004 The American Physiological Society |
DOI: | 10.1152/jn.00595.2003 |
Published version: | http://jn.physiology.org/cgi/content/abstract/91/4/1570 |
Appears in Collections: | Aurora harvest 6 Molecular and Biomedical Science publications |
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