[Comparative analysis of possible ways of activating depolarizing neurons in the system of flexor reflex afferents]

Two schemes of activation of depolarizing neurons at the level of the first synaptic relay in the polysynaptic reflex arc were compared on an electronic model. It is shown that in the system without a feedback a long delay in the transition process of dorsal surface potentials must be observed during rhythmic stimulation of the afferent input. A decrease in the amplitude-frequency characteristics in this system must be observed as well. These findings contradict to neurophysiological data about changes in the N1-cord dorsum potential. The conclusion is made that a more acceptable scheme of activation of depolarizing neurons is the one with a negative feedback circuit formed by C-interneurons.