[Demonstration of interactions between visual and splanchnic afferences at the level of the cerebral cortex in cats]

In the chloralose-anesthetized cats, evoked potentials (E.P) were recorded from cerebral cortex with the use of 1) macroelectrodes in two overlapping zones between splanchnic and visual areas : Medial Lateral and Anterior Suprasylvian (S II) gyri ; 2) microelectrodes in Medial Lateral gyrus. Our results show : 1) a strong increase of the primary visual E.P. in Medial Laternal gyrus by splanchnic stimulus ; 2) a strong inhibition of the primary splanchnic E.P. in S II by visual stimulus ; 3) an inhibition of some cortical neurons in Medial Lateral gyrus by splanchnic stimulus ; 4) an inhibition of associative visual E.P. in S II by splanchnic stimulus, and of associative splanchnic E.P. in Medial Lateral gyrus by visual stimulus. In the other hand splanchnic and visual E.P. were recorded from N. reticularis and Corpus Geniculatum Mediale with the use of concentric electrode. Some hypothesis concerning interrelations mechanisms are discussed.