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Functional Correlation between Neocortical and Limbic System Toshihiko Tokizane 1 1Dept. of Neurophysiology, Institute of Brain Research, Univ. of Tokyo pp.500-508
Published Date 1963/6/25
DOI https://doi.org/10.11477/mf.1431904032
  • Abstract
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The role of the midbrain reticular formation and hypothalamus and the functional correlation between these two structures in activating mechanism for the cerebral cortex were studied in Flaxedil immobilized cats, by means of simultaneous recording of EEG from the neo- and limbic cortices. In cerveau isole preparation, the neo- and limbic cortices showed sleep and arousal patterns respectively, and stimulation of the hypothalamus exhibited the activating effect only upon the limbic cortex. In this preparation the same results were also obtained by injection of adrenaline or inhalation of carbon dioxide. On the other hand, a stronger stimulation of the hypothalamus on the intact brain produced activation patterns in the neocortex as well as limbic cortex. From these results, it may be reasonablly considered that the midbrain reticular formation contains the activating mechanism only for the neocortex, while the hypothalamus includes the activating mechanism not only for the limbic cortex, but also for the neocortex via the hypothalamo-midbrain route. This backwards activating effect upon the reticular formation from the hypothalamus will provide the functional correlation between the neocortical and limbic system. This assumption is supported from the fact that the changes in the wave forms of the evoked potential and discharge patterns of strychnine spikes on the neocortex correspond to change of hippocampal EEG patterns which is demonstrated to be an indicator of the activity level of the hippo-campus.


Copyright © 1963, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1243 印刷版ISSN 0001-8724 医学書院

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