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October 1964

Ventrolateral and Subventrolateral Thalamic Stimulation: Motor Effects

Arch Neurol. 1964;11(4):427-434. doi:10.1001/archneur.1964.00460220089012

Since Hassler and Riechert reported for the first time in 1954,6 there have appeared many papers concerning clinical and physiological observations of abnormal movements, such as tremor, jerking, and other dyskinesia, during the stereotaxic procedure on the ventrolateral nucleus (VL) of the thalamus.1,2,4-6,8,9,11-13,18,255,26

In the preceding paper by Yoshida et al,28 investigation of the thalamic evoked potential on skull and cortical EEG is described in detail, and this potential is found to be quite reliable in deciding the lowermost border of the nucleus. This paper deals with effects of high-frequency electrical stimulation of the nucleus on motor activity in parkinsonism, giving special attention to the evoked rhythmic potential described in the preceding paper.28

Methods  The results are obtained from 38 patients with parkinsonism on whom VL thalamotomy was performed under local anesthesia, as described in the preceding paper.28 Patients were usually in the supine position

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