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RONALD E. KALIL RONALD CHASE Deifiartmen t of Psychology, Massachusetts Institute Cânm bridge, Massachusetts 02139 DORSAL-LATERAL geniculate nuckus Of the cat receives direct projections from visual cortex (6, 16, 21, 48). These projections are widely distributed within the lateral geniculate without special regard for laminar boundaries, they appear to be or(ganized retinotopically such that a cise reciprocal connection exists between visual cortex the lateral geniculate nucleus. In view of the prominence of these corticogeniculate connections, it is surprising that relatively little physiological work has been done to elucidate their function. One line of investigation has provided evidence that stimulation of visual cortex can produce effects within the lateral geniculate that are intertable as synaptic inhibition of optic tract terminals (4, 27, 46). But inhibition is not the sole exerted by visual cortex on the lateral geniculate. Wid&n Ajmone Marsan (51) later Ajmone Marsan Morillo (1) studied the effects of stimulating the visual cortex on the response of single units in the lateral geniculate to diffuse flashes of light or to electrical stimulation of the optic tract. Although inhibitory effects dominated, one-third of the units they studied were facilitated by stimulating the cortex. Additional evidence for the facilitating effects
Journal of Neurophysiology – The American Physiological Society
Published: May 1, 1970
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