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Annual Summary Report, 15 June 1960-14 June 1961,

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The habituation and the dishabituation of the visual responses to repetitive light flashes were investigated in the cerveau isole cat. The hypothesis of the habituation and of the release from dishabituation of the evoked visual potentials hinges upon the demonstration that the light striking the retina remains rigorously constant. The experiments on the relations between neurophysiology and animal behavior were concerned with the ocular manifestation of sleep in the owl placed in a dark, silent room. Experiments on the central influence of the retinal black-out on the central nervous system show that EEG synchronization increases following bilateral withdrawal of the retinal dark discharge in the cerveau isole cat, and following complete postcollicular transection, EEG activating structures, are still at work in the isolated cerebrum. The study of the effect of diffuse light and of the retinal black-out on the responses of the visual cortex elicited by lateral geniculate shocks led to the hypothesis that the effect of steady light is related with a decrease of the retinal dark discharge. Data suggest that steady light decreases the total retinal bombardment which was present in the dark adapted eye. Author

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