1. Blyth, K. W., Nature, 199, 1312 (1963).
2. Humphrey, M. E., Brit. J. Educ. Psychol., 21, 214 (1951).
3. Zangwill, O. L., Cerebral Dominance and its Relation to Psychological Function (London, 1960).
4. Critchley, M., The Parietal Lobes (London, 1953).
5. Semmes, J., Weinstein, S., Ghent, L., and Teuber, H.-L., Somatosensory Changes after Penetrating Brain Wounds in Man (Harvard, 1960).