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Optical Illusion alters M1 Excitability after Mirror Therapy - a TMS Study.
MedLine Citation:
PMID:  22972955     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Introduction: The contralesional primary motor cortex (M1) has been suggested to be involved in the motor recovery after Mirror Therapy. But, whether the ipsilesional M1 is influenced by the contralesional M1 via the transcallosal interhemispheric inhibition (IHI) is still unclear. The present study investigated the change of IHI as well as the intracortical inhibition and the intracortical facilitation of both M1 induced by training in a mirror with the use of the transcranial magnetic stimulation (TMS). Methods: In this 2x2 factorial design (time x group) healthy subjects exercised standardized motor skills with their right hand on four consecutive days. Either a mirror (mirror-group) or a board (control-group) was positioned between both hands. Before and after training the TMS was applied along with training tests of both hands. Tests were the same motor skills daily exercised by both groups. Results: Test of the untrained left hand improved significantly more in the mirror-group than in the control-group after training (p = 0.02) and showed a close correlation with an increase of intracortical inhibition of M1left. IHI did not show any difference between both investigation time points and groups. Conclusion: The current study confirms previous suggestion of the involvement of the "contralesional"-left-sided (ipsilateral to the hand behind the mirror) M1 after Mirror Therapy, which is not mediated by IHI. Even with the same motor skill training (both groups performed same motor skills) but with different visual information, different networks are involved in training induced plasticity.
Authors:
Claus Henning Laeppchen; Thomas Ringer; Juliane Blessin; Gundula Seidel; Steven Grieshammer; Ruediger Lange; Farsin Hamzei
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-9-12
Journal Detail:
Title:  Journal of neurophysiology     Volume:  -     ISSN:  1522-1598     ISO Abbreviation:  J. Neurophysiol.     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-9-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0375404     Medline TA:  J Neurophysiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
1University Medical Centre, Freiburg, Germany.
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