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Electroencephalogram (EEG) using standard ipsilateral ear reference montage in each stage. Before surgical interventions, EEG showed high-voltage sharp waves in bilateral frontal and parietal lobes (a). After anterior corpus callosotomy (CC), high-voltage sharp waves and slow waves in bilateral frontal and parietal lobes still persisted (b). After posterior CC, EEG showed high-voltage slow waves without bilateral synchrony (c).
