Abstract
The latency and amplitude of evoked potentials in the general cortex of the turtle forebrain depend on localization of a point light source in the visual field. Maximal evoked responses show that retinal quadrants are connected predominantly with corresponding areas of the forebrain cortex. Most neurons (70 or 80) have wide receptive fields commensurate with the entire visual field. Distribution of the most effective points within the receptive field of the neurons also indicates their predominant connection with certain retinal quadrants. All dorsal cortical neurons exhibit high reactivity to displacement of objects in the visual field. A stationary light source also evokes different unit responses in the surface and deep layers of the cortex.
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