Abstract
The effects of stimulation of the mesencephalic reticular formation on inhibition of visual cortex neurons by optic radiation stimulation was studied in locally anesthetized acute cats. If reticular stimulation excited a visual cortex unit an enhancement of subsequent optic radiation evoked inhibition was observed. This occurred for 50–400 msec following reticular stimulation and was maximal at 200 msec. For some cells, reticular stimulation initially inhibited spontaneous discharge. For these units a shortened duration of optic radiation evoked inhibition was often observed when that stimulus was placed during the reticular evoked inhibition. A hypothesis is presented to account for these effects.
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