| Abstract: | There is a definite relationship between the amplitudes of the first positive phase of primary surface responses and the first negative phase of responses by the V layer of the cortex at the same point of the cortex 4, 5]. In this article we present the results of verification of the suggestion that hyperpolarizing and depolarizing postsynaptic potentials of the surface dendrites of the cortex have an electrotonically modulating effect on the manifestation of postsynaptic potentials by the membranes of the bodies of pyramidal neurons 4, 5]. Our findings have confirmed the existence of a relationship between the first positive phase of primary surface responses and the first negative phase of responses by the V layer of the cortex, have discovered its nature (a rectilinear positive correlation, the coefficient of which is 0.65), and also have reliably (B>0.999) demonstrated the existence of a modulating effect of the above-mentioned positive phase on the development of the negative phase and the possible proportion of that effect (up to 88%) in the total of effects on the latter produced by all the factors that induce fluctuations in the amplitude of that phase in certain experimental conditions.Chair of Normal Physiology, P. Lumumba University of International Friendship, Moscow. Translated from Neirofiziologiya, Vol.3, No.5, pp. 520–525, September–October, 1971. |
