In alert rabbits, pulse stimulation of the visual cortex interfered with the formation of short latency responses in superior colliculus. The effect of visual cortex upon the superior colliculus function may have a phasic inhibitory character. Blockade of the RF adrenergic apparatus enhances the inhibitory effect, whereas stimulation of the RF by anodal current induces an opposite effect. The character of cortical influence upon the superior colliculus function seems to depend on initial functional state of cerebral unspecific systems.
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