RESPONSE TO COLORED LIGHT FLASH FROM DIFFERENT AREAS OF OPTIC CORTEX AND FROM RETINA IN ANESTHETIZED CAT

Abstract

Cortical responses to light flash were recorded with 1 x 1 mm silver electrodes from posterior, mid and anterior portions of gyrus marginalis in anesthesized cats. The light flash, 10 or 100 msec in duration, was variable with respect to intensity over 6 decades by means of neutral filters, and with respect to color by means of blue, green, yellow and red color filters. Amplitude of the responses was greatest anteriorly, as was the latency and the change of latency with intensity. The on response consisted of two phases posteriorly. Differences between posterior and anterior optic cortex seemed in these experiments to be due to the absence anteriorly of the first phase of the response.