Abstract
The mode of action of ethanol on afferent volleys in the central visual pathway was studied in gallamine-immobilized cats. ERG and evoked responses in the optic tract, visual cortex and motor cortex induced by flash light stimulation were progressively reduced in amplitude by administering increasing amounts of ethanol, while those in the lateral geniculate nucleus were only slightly depressed following large doses of ethanol. Evoked responses in the lateral geniculate nucleus to electrical stimulation of the optic tract showed an increase in amplitude following ethanol, while depressant effects were seen in the visual cortex. Latencies of these responses in the central visual pathway were not changed even by large doses. These results suggest that sites of ethanol actions in the ascending visual pathway are primarily in the retina and cerebral cortex, not in the lateral geniculate nucleus.
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