In 24 cats, premesencephalic section of the brain-stem affected the sleep-wakefulness cycle and caused desynchronization of the neocortical activity 3-4 days after total isolation of the mesencephalic RF. The data obtained corroborates the existence of a certain brain structure situated more rostrally than the mesencephalic RF which is able to cause by itself the neocortical activation.
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The midbrain was isolated by two brainstem transections, pretrigeminal and premesencephalic. In the isolated midbrain, particularly within the reticular formation, EEG activity was greatly depressed. On the other hand, single-unit spike activity remained at a high level.
View Article and Find Full Text PDFPreferential ipsilateral influence of the posterior hypothalamus on the neocortex.
Neurosci Behav Physiol
December 1978
On the 10th--20th day after precollicular transection of the brain stem weak low-frequency electrical stimulation of the posterior hypothalamus preferentially activates the ipsilateral neocortex. After unilateral injury to the posterior hypothalamus, synchronous activity predominates in the ipsilateral neocortex. In premesencephalic animals weak single electrical stimulation of the posterior hypothalamus evokes the appearance of spindles in ipsilateral zones of the frontal cortex, whereas stronger single stimulation causes the diffuse generation of spindles in various parts of the neocortex.
View Article and Find Full Text PDF[The role of several brain stem structures in activation of the neocortex and motor reflexes in chronically premesencephalic cats].
Fiziol Zh SSSR Im I M Sechenova
January 1976
Chronic experiments were carried out in 18 cats. After premesencephalic section of the brain-stem, the neocortex can be activated both spontaneously and in response to the posterior hypothalamus or the forepaw skin stimulation. After bilateral lesions in the posterior hypothalamus, neither spontaneous nor the forepaw-skin stimulation-produced activation of the neocortex, was observed.
View Article and Find Full Text PDFHigh-frequency electrical stimulation of the-posterior hypothalamus applied 10-20 days after the sectioning of the brain stem at the level of the anterior frontal margins of the anterior coliculus results in the preferential activation of the ipsilateral neocortex. When unilateral lesions are placed in the posterior hypothalamus, the predominance of synchronous activity in the ipsilateral neocortex is observed. In the premesencephalic preparations, weak single electrical stimulation of the posterior hypothalamus provokes spindles in the ipsilateral portions of the frontal cortex.
View Article and Find Full Text PDFExperiments were carried out on 19 adult cats with chronic brain stem transections at the level of the foremost border of the supperior colliculus. High-frequency electric stimulation of the posterior hypothalamus produced in these cats desynchronization of electrical activity in different parts of the neocortex. A predominant influence from the posterior hypothalamus on the electrical activity of frontal lobes was observed.
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