ELECTRICAL ACTIVITY OF THE NEOSTRIATUM, PALEOSTRIATUM, AND NEIGHBOURING STRUCTURES IN PARKINSONISM AND HEMIBALLISMUS

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Abstract
Ten cases of Parkinsonism and one of hemiballismus were examined by the following techniques; (1) electro-grams from the neo- and paleostriata and their neighborhoods, (2) concurrently recorded electroencephalograms and (3) elec-tromyograms from the tremor affected limbs. Four of the 10 cases of Parkinsonism had electroencephalographic records indistinguishable from control records. Of the remaining 6 cases, 5 had "fast" runs and one showed slow dominant waves. No consistent relationship between the above records and the kind and degree of clinical symptoms was observed. There was no apparent relation between the electrical activity of the corpus striatum and neighboring structures or between electro-myographic activity and observable alternating tremors. Elec-tromyograms of tremor activity did not correlate with con-comitantly recorded electrostriatograms or electroencephalograms. The electroencephalograms of the hemiballismus case were not distinguishable from those of controls. The records are illustrated and the results discussed.