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Neurology 2002;58:1290-1293
© 2002 American Academy of Neurology
Brief Communications

Bilateral motor cortex output with intended unimanual contraction in congenital mirror movements

M. Cincotta, MD, A. Borgheresi, MD, P. Boffi, MD, P. Vigliano, MD, A. Ragazzoni, MD, G. Zaccara, MD and U. Ziemann, MD

From the Unit of Neurology (Drs. Cincotta, Borgheresi, Ragazzoni, and Zaccara), Santa Maria Nuova Hospital, Florence, Italy; Department of Neuropediatrics (Drs. Boffi and Vigliano), University of Turin, Italy; and Department of Neurology (Dr. Ziemann), J.W. Goethe-University, Frankfurt/Main, Germany.

Address correspondence and reprint requests to Dr. Massimo Cincotta, U.O. di Neurologia, Azienda Sanitaria di Firenze, Ospedale S. Maria Nuova, Piazza S. Maria Nuova, 1, 50122 Florence, Italy; e-mail: cincotta{at}unifi.it

In congenital mirror movements (MM), it is unclear whether the "mirror" motor cortex (M1) produces output during intended unimanual movements. In two patients with MM, the cortical silent period (CSP) was abnormally short after focal transcranial magnetic stimulation (TMS) of either M1, but simultaneous bilateral TMS led to significant CSP lengthening. Thus, it is likely that the shortened CSP after unilateral TMS is caused by output from the nonstimulated M1, suggesting that both M1 produce output with intended unimanual movements in patients with MM.




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Y Ueki, T Mima, T Oga, A Ikeda, T Hitomi, H Fukuyama, T Nagamine, and H Shibasaki
Dominance of ipsilateral corticospinal pathway in congenital mirror movements
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