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In October 1961, there was presented a comprehensive account of stereotaxic techniques, relevant physiological and pathophysiological studies, and finally of clinical analyses of results in the treatment of various involuntary movements, rigidity intractable pain, tumors, and epilepsy. This was organized by the two pioneers in the field, Drs. E. A. Spiegel and H. T. Wycis, and their list of invitees included virtually every productive group in this burgeoning field active at that time on the entire planet. It was appropriate that the first two workers in the field should issued the call which brought together this group. Sweden, Germany, France, Britain, Switzerland, Spain, Japan, Canada, and the United States were the countries represented.
At the present time it is clear that no one type of technique for placing the electrophysiological recording or lesion-making device and no one method of making the lesion enjoy a clearcut superiority over a number of