Abstract
Various EEG changes were noted during chemopallidectomy in patients with Parkinonism and other extrapyramidal affections. Among these the changes in the two types of ⊖-rhythm attract particular attention. Disappearance of the homolateral ⊖-rhythm (type I) affected basal ganglia in pallidum stimulation and its exclusion points to the existence of a unilateral connection with the cortex of the homolateral hemisphere. Disappearance of the bilateral ⊖-rhythm (type II) in the anterior portions of the cortex after pallidum stimulation and its restoration after pallidum exclusion point to the functional relationship of the pallidum to the anterior portions of cerebral cortex through the rostral portions of the stem with which bilateral synchronism is connected.
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