ORIGIN OF A PHOTICALLY EVOKED AFTERDISCHARGE IN CAT VISUAL CORTEX

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Abstract
A visual cortex "afterdischarge" to photic stimulation was studied in cats anesthetized with chloralose or sodium pentobarbital. The afterdischarge, called the "second complex", has a longer latency than the antecedent "primary complex". Results showed that: 1) The second complex is similar to the primary in wave-form, cortical distribution, and intracortical potential profiles; 2) Amplitude and recovery cycles of the second complex are reciprocally related to the amplitude of the primary complex; 3) Most visual cortex single units discharging during the second complex discharge also during the "on** primary complex and/or the "off" response; 4) Potentials corresponding to the cortical second complex are usually present in structures of the afferent optic pathway; 5) The second complex survives removal by suction of extra-geniculate thalamus and mesencephalon; and 6) Retinal ischemia selectively depresses the second complex. Thus, the site of origin for the second complex is likely the retina.

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