Abstract
The effects of superior colliculus and visual cortex stimulation on pericruciate cortex was studied at neuronal level in chloralose-anesthetized cats. A controlled background of activity, induced by iontophoretic release of glutamate served to evaluate inhibitory input. The results indicate that motor-sensory cortex in cats receives stimuli from those two neuronal groups which are related with different aspects of visual perception. A high degree of convergence was observed between visual cortical and collicular stimulation, but the latencies observed, differences in inhibitory effects, and differences in following frequencies, higher for the collicular input, indicate that they may arrive by independent pathways at the pericruciate cortex. Based on functional considerations, it is suggested that these two inputs perform complimentary functions in pericrucriate cortex, which add to the unity observed in the freely behaving animal.
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