Abstract
A nine year old boy presented a right hemiparesis and convulsive seizures since infancy. Convulsions could not be controlled in spite of large doses of anticonvulsant drugs. The child was severely mentally retarded. A pneumoencephalogram revealed a large porencephalic cyst and generalized atrophy of the left hemisphere. Electroencephalography showed multiple spike foci discharging independently on both hemispheres. Scalp electrodes were applied to the right side before exposing surgically the left hemisphere. Simultaneous recording was performed from right scalp and left cortical electrodes. Active spikes were recorded independently from both sides. After section of the corpus cal-losum, the spikes from the right disappeared; the left side showed no changes. Left hemispherectomy was then performed. The implications of these results are discussed in the context of criteria for definition of independent spikes in the EEG and of the existence of mirror foci in man.
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