Summary
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1.
Evoked potentials that change their sign with depth in the cortex are recorded from the medial surface of the frontal lobe in response to stimulation of the posterior hypothalamus and from the periamygdalar cortex in response to stimulation of the amygdala. Stimulation of these structures is also accompanied by the appearance of evoked potentials over a wide area of the cortex which do not reverse their sign with depth.
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2.
Of 326 cortical units investigated in the zone in which the evoked potential did not change its sign with depth (posterior sigmoid gyrus), 26 neurons modified their background activity under the influence of stimulation of the posterior hypothalamus or amygdala. On the basis of this analysis, the hypothesis is put forward that direct and polysynaptic connections exist between the posterior hypothalamus and amygdala, on the one hand, and somatosensory cortical neurons on the other.
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It can be concluded from these results that subcortical regions of the limbic system, i.e., the posterior hypothalamus and nuclei of the amygdala, have extensive and diffuse connections with the neocortex which can act as an important mechanism for interaction of motivational and emotional factors with the analyzer systems.
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Storozhuk, V.M., Vladimirova, I.A., Kozyreva, T.V. et al. Functional connections of the posterior hypothalamus and amygdala with the somato-sensory cortex. Neurosci Behav Physiol 2, 968–976 (1968). https://doi.org/10.1007/BF01124749
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DOI: https://doi.org/10.1007/BF01124749