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2. T. H. Bullock, in Fish Neurobiology, and Behavior. R. E. Davis and R. G. Northcutt. Eds. ( Univ. of Michigan Press, Ann Arbor, 1983 ), vol. 2, p. 441.
3. T. H. Bullock, in Neurobiology of the Mauthner Cell, D. Faber and H. Korn, Eds. (Raven. New York, 1978), p. I: in Information Processing in the Nervous System, H. M. Pinsker and W. D. Willis Jr., Eds. (Raven, New York, 1980), p. 199. A set does not necessarily mean discontinuous distribution of defining properties; overlapping sensory fields in the skin may form a continuum between widely disparate receptive fields but. as in handicapping or grading, as soon as enough difference has accumulated to be judged appreciable. an arbitrary line can he drawn. The operative word is distinguishable-meaning significantly distinct by any criterion, in our judgment.
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5. R. Lorente de Nó, in Physiology of the Nervous System, J. F. Fulton, Ed. ( Oxford Univ. Press, Oxford, 1938 ). p. 307.