Effect of Cortical Stimulation upon Synaptic Transmission in the Lateral Geniculate Body of the Cat

概要

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The effect of cerebral stimulation upon geniculate evoked responses was studied on locally anesthetized and immobilized cats. A conditioning shock to the visual cortex and surrounding areas depressed the postsynaptic component of the geniculate evoked response to a testing optic tract stimulus. The presynaptic component was hardly affected. The effect was most marked when conditioning and testing stimuli were separated by an interval of 80-120msec. The corticifugal effect was more effective in the ipsilateral visual cortex than in the contralateral. Stimulation of visual area II was more favorable than that of visual area I. The possible nature of this effect was considered and discussed in comparison with the facilitatory effect of the reticular formation, and it was concluded that the depression of the postsynaptic component is due to inhibition coming from the cortex through multisynaptic pathways to the lateral geniculate body.
東北ジャーナル刊行会の論文