Hemispheric Differences in the Relationship Between Corticomotor Excitability Changes Following a Fine-Motor Task and Motor Learning

1 Discipline of Physiology, School of Molecular and Biomedical Science, The University of Adelaide, Adelaide SA 5005, Australia 2 Department of Exercise Science, University of Massachusetts, Amherst, Massachusetts 01003 Submitted 20 June 2003; accepted in final form 16 November 2003 Motor performanc...

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Bibliographic Details
Published in:Journal of neurophysiology 2004-04, Vol.91 (4), p.1570-1578
Main Authors: Garry, Michael I, Kamen, Gary, Nordstrom, Michael A
Format: Article
Language:English
Subjects:
Adolescent
Adult
Analysis of Variance
Dose-Response Relationship, Radiation
Electric Stimulation - methods
Electromyography - methods
Evoked Potentials, Motor - radiation effects
Female
Functional Laterality - physiology
Humans
Inhibition (Psychology)
Learning - physiology
Magnetics
Male
Motor Cortex - physiology
Motor Skills - physiology
Motor Skills - radiation effects
Muscle, Skeletal - physiology
Muscle, Skeletal - radiation effects
Psychomotor Performance - physiology
Regression Analysis
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Summary:1 Discipline of Physiology, School of Molecular and Biomedical Science, The University of Adelaide, Adelaide SA 5005, Australia 2 Department of Exercise Science, University of Massachusetts, Amherst, Massachusetts 01003 Submitted 20 June 2003; accepted in final form 16 November 2003 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 (
ISSN:0022-3077
1522-1598
DOI:10.1152/jn.00595.2003