Document Detail

No graded responses of finger muscles to TMS during motor imagery of isometric finger forces.
MedLine Citation:
PMID:  21406217     Owner:  NLM     Status:  MEDLINE    
Previous studies of motor imagery have shown that the same neural correlates for actual movement are selectively activated during motor imagery of the same movement. However, little is known about motor imagery of isometric force. The aim of the present study was to investigate the neural correlates involved in motor imagery of isometric finger forces. Ten subjects were instructed to produce a finger flexion or extension force ranging from 10% to 60% of maximal isometric force and to mentally reproduce the force after an eight-second delay period. Transcranial magnetic stimulation (TMS) was applied over the hand motor area during imagining the force. We measured the amplitude of motor evoked potentials (MEPs) from the flexor digitorum superfialis (FDS) and the extensor digitorum communis (EDC) muscles and TMS-induced forces from the proximal phalanxes. The results showed that, as compared to the rest condition, the MEP amplitude was greater in the FDS during imagining flexion forces, whereas it was greater in the EDC during imagining extension forces. MEP amplitudes were similar for motor imagery of graded flexion or extension forces. Also, TMS produced flexion forces during imagining flexion forces, whereas it produced extension forces during imagining extension forces. There was no change in the amplitude of TMS-induced forces across graded motor imagery task. These results support the notion that the same neural correlates for actual movement could be selectively activated during motor imagery of the same movement, but demonstrated that the magnitude of isometric force could not be mentally simulated.
Woo-Hyung Park; Sheng Li
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2011-03-22
Journal Detail:
Title:  Neuroscience letters     Volume:  494     ISSN:  1872-7972     ISO Abbreviation:  Neurosci. Lett.     Publication Date:  2011 May 
Date Detail:
Created Date:  2011-04-15     Completed Date:  2011-08-17     Revised Date:  2014-09-21    
Medline Journal Info:
Nlm Unique ID:  7600130     Medline TA:  Neurosci Lett     Country:  Ireland    
Other Details:
Languages:  eng     Pagination:  255-9     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 Elsevier Ireland Ltd. All rights reserved.
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MeSH Terms
Evoked Potentials, Motor / physiology*
Fingers / innervation
Imagination / physiology*
Isometric Contraction / physiology*
Motor Cortex / physiology*
Muscle, Skeletal / physiology*
Transcranial Magnetic Stimulation
Grant Support
R01 NS060774/NS/NINDS NIH HHS; R01 NS060774-01A2/NS/NINDS NIH HHS; R01 NS060774-02/NS/NINDS NIH HHS; R01 NS060774-03/NS/NINDS NIH HHS; R01 NS060774-04/NS/NINDS NIH HHS; R01NS060774/NS/NINDS NIH HHS

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