1 Child Research Council and the University of Colorado School of Medicine, Denver, Colorado. This material was presented in abbreviated form at the Society for Research in Child Development, Berkeley, California, April, 1963. The investigation was supported in large part by the Field Foundation and by the Scottish Rite Committee on Research in Schizophrenia. The writers wish to acknowledge with gratitude Dr. John D. Benjamin's major help and guidance.
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Tennes et al. (1964) studied this question.