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Neurology 2000;55:429-431
© 2000 American Academy of Neurology
Brief Communications

Nonconvulsive focal inhibitory seizure: Subdural recording from motor cortex

R. Matsumoto, MD, A. Ikeda, MD, PhD, S. Ohara, MD, T. Kunieda, MD, K. Kimura, MD, PhD, J. B. Takahashi, MD, PhD, S. Miyamoto, MD, PhD, W. Taki, MD, PhD, N. Hashimoto, MD, PhD and H. Shibasaki, MD, PhD

From the Department of Brain Pathophysiology, Human Brain Research Center (Drs. Matsumoto, Ikeda, Ohara, Kunieda, Kimura, and Shibasaki), the Departments of Neurology (Drs. Ikeda and Shibasaki), and Neurosurgery (Drs. Kunieda, Takahashi, Miyamoto, and Hashimoto), Kyoto University Graduate School of Medicine; and the Department of Neurosurgery (Dr. Taki), Mie University School of Medicine, Tsu, Japan.

Address correspondence and reprint requests to Dr. Hiroshi Shibasaki, Departments of Brain Pathophysiology and Neurology, Kyoto University Graduate School of Medicine, 54 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto, 606-8507, Japan; e-mail: shib{at}kuhp.kyoto-u.ac.jp

The authors obtained an ictal electrocorticogram with chronically implanted subdural electrodes from a 30-year-old man with a low grade glioma in the right postcentral gyrus who had a focal inhibitory seizure of the left arm. During the ictal paresis, the authors observed epileptic discharges in the positive arm motor area of the right precentral gyrus and in its rostral area, but not in the negative motor area. The epileptic activity probably inhibited the spinal motoneuron pool without eliciting excitatory activity in the corticospinal pathway.




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