Abstract
Interhemispheric coherence analysis of scalp electroencephalograms (EEGs) in three intractable epileptic patients before and after surgical section of the anterior part of the corpus callosum was performed. Equidistant EEG periods recorded under resting conditions free of interictal epileptic activity and periods with generalized spike‐and‐wave discharges were investigated. Mean coherence values for five frequency EEG bands (delta, theta, alpha, beta 1 and beta 2) before and after corpus callosotomy were compared with each other and statistically evaluated. Anterior callosotomy led, in all cases, to a decrease of interhemispheric EEG coherence in most localizations, with the most profound decreases in the region corresponding to the section. These results support the hypothesis that the corpus callosum plays an important role in resting interhemispheric integration and EEG synchronization, similar to its central role in propagation of specific epileptic activity.
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