1 Departments of Anatomy, Physiology, and Divisions of Neurology and Neurosurgery, University of California at Los Angeles, Los Angeles, California. This work was assisted by the U. S. Public Health Service under Grant B-1883 and B-611 from the National Institutes of Health, and by a grant from the Parkinson Disease Foundation.
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Adey et al. (1959) studied this question.