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1 Neurosensory Center and Departments of Neurology and Psychology, University of Iowa, Iowa City. This paper was presented at the 36th Annual Meeting of the Midwestern Psychological Association. St. Louis, April 1964. The preparation of this review was supported by Program Project Grant NB-03354 from the National Institute of Neurological Diseases and Blindness, U.S.P.H.S Neurosensory Center Publication No. 48.
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Spreen et al. (1965) studied this question.
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