Influence of pulse stimulation of the visual cortex on the function of the superior colliculus of the awake rabbit.

It has been demonstrated in awake rabbits that stimulation of the visual cortex by a solitary pulse of electrical current leads to the formation of a short-latency response in the superior colliculus. The formation of this response is suppressed when a light stimulus precedes it. At the same time, a conditioning solitary electrostimulation of the visual cortex induces a short inhibition of the formation of the response to the test light stimulus.

[Interactions of the superior colliculus and the sensorimotor cortex in the alert rabbit].

The tonic increased influence of the superior colliculus (SC) on the formation of visual responses of the sensorimotor cortex (SMC) was shown on the alert rabbits. It was shown that SC influence was realized through tectothalamocortical (nucleus lateralis posterior) canal relation. It was established that SMC of the alert rabbits in its turn exerts the inhibitory phasic influence on SC function.

[Effect of cat motor cortex on the formation of lateral geniculate nucleus responses evoked by contralateral superior colliculus stimulation].

It was shown in experiments on anesthetized cats that motor cortex (MC) stimulated by single current pulse caused formation of the lateral geniculate nucleus (LGN) response. It was established that changes in formation of LGN response evoked by contralateral superior colliculus (SC) stimulation were observed by condition of the precedence of LGN response evoked by stimulation of the MC. The expressiveness level of that decrease depended on intervals between conditioning cortical and testing tectal stimuli.

[The effect of impulse stimulation of the visual cortex on the function of the superior colliculus in the waking rabbit].

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 effect of the superior colliculus on the function of the contralateral lateral geniculate body in the cat].

In acute experiments on rats it was shown that stimulation of the superior colliculus [correction of upper bimounding] leads to the formation in the contralateral lateral geniculate [correction of external geniculated] body of a colliculus-geniculate response. The nature of the changes in a considerable degree is determined by the fact, to which neurones of the lateral geniculate [correction of external geniculated] body, the effect of contralateral superior colliculus [correction of upper bimounding] is addressed.