Experimental Brain Research

, Volume 133, Issue 2, pp 249–253 | Cite as

Reduced interhemispheric inhibition in musicians

  • M.C. Ridding
  • B. Brouwer
  • M.A. Nordstrom
Research Article


In vivo magnetic resonance imaging has revealed that the anterior half of the corpus callosum is larger in musicians trained intensively from an early age than in untrained subjects. The corpus callosum is crucial for the coordination of bimanual motor activity, but neurophysiological correlates of morphological differences in the corpus callosum of musicians are not known. In the present study we have used transcranial magnetic stimulation (TMS) to assess interhemispheric inhibition in six adult professional musicians who began musical training at an early age. Conditioning TMS was applied to the hand area of the motor cortex of one hemisphere, followed 4–16 ms later by a test stimulus applied to the other hemisphere. Tests were performed at rest, and with the first dorsal interosseous muscle contralateral to the conditioning hemisphere voluntarily active. Conditioning TMS in musicians was 29% less effective at reducing the size of the test MEP at rest, and 63% less effective in the active condition, compared with control subjects. We conclude that transcallosal interhemispheric inhibitory circuits activated by TMS are less effective in musicians than in controls.

Inhibition Motor cortex Corpus callosum Musicians 


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Copyright information

© Springer-Verlag 2000

Authors and Affiliations

  • M.C. Ridding
    • 1
  • B. Brouwer
    • 3
  • M.A. Nordstrom
    • 2
  1. 1.Department of Medicine, Royal Adelaide Hospital, Adelaide, Australia 5000
  2. 2.Department of Physiology, University of Adelaide, Adelaide, Australia 5005
  3. 3.School of Rehabilitation Therapy, Queen's University, Kingston, Ontario, Canada K7L 3N6

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