Posttetanic potentiation of primary response and late negative wave in the somatosensory region of the cortex of the cat

Neuroscience and Behavioral Physiology
I Ocherashvili, R P Kashakashvili

Abstract

The experiments were carried out on cats under nembutal anesthesia. Stimulation of the ventroposterolateral nucleus of the thalamus or the white matter by a single stimulus elicited a primary response in the middle layers of the somatosensory cortex, and after it, a late negative wave, the duration of which reaches 40-70 msec. This potential does not have dipole reflection on the surface of the cortex and is apparently generated primarily by stellate cells. As a result of the tetanization of the ventroposterolateral nucleus or the white matter, a sharp increase in the amplitude of the late negative wave is observed, i.e., its posttetanic potentiation, while the primary response changes to a significantly lesser degree. Posttetanic potentiation is observed for 2-2.5 h. Posttetanic potentiation of the late negative wave is probably governed by processes occurring at the level of the middle layers of the cerebral cortex.

References

Mar 1, 1979·Die Naturwissenschaften·J C Eccles

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