1Division of Neurology, University of Oregon Medical School, Portland, Oregon. This investigation, supported by Public Health Service Grant No. B-1140, was presented in part at the American EEG Society, October, 1957. The author wishes to acknowledge with thanks the assistance of Miss Jacquetta Nelson and Dr. John Watkins of the U. S. Veteran's Hospital, Portland, Oregon.
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Janice R. Stevens (1959) studied this question.