Visually Evoked Electrocortical Responses in Kittens: Development of Specific and Nonspecific Systems

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Science  28 May 1965:
Vol. 148, Issue 3674, pp. 1244-1246
DOI: 10.1126/science.148.3674.1244


Visually evoked electrocortical responses were differentiated ontogenetically in young kittens by age of onset, latency, and polarity. A long-latency negative wave, present by 4 days of age and abolished later by lesions of the superior colliculus and pretectal region of the midbrain, is attributed to the non-specific sensory system. A short-latency, positive and negative, diphasic wave, developing by 10 to 15 days of age and blocked by lesion of the lateral geniculate body, is identified with the specific visual system.