[Rearrangement of the efferent activity of a locomotor generator under electric activation of descending systems in immobilized cats].

Rearrangement of the locomotor generator activity evoked by phasic electrical stimulation of different descending systems has been investigated on decerebrated immobilized cats. The rearrangement heavily depends on the stimulation phase. A maximal increase of the locomotor cycle duration by electrical stimulation of the Deiters nucleus takes place in the end of an "extensor" phase. Stimulation of the Deiters nucleus during the flexor phase decreases the locomotor cycle duration. A maximal increase of the locomotor cycle duration by electrical stimulation of the red nucleus, pyramidal tract and reticular gigantocellular nucleus takes place in the first half of a "flexor" phase. Electrical activation of these descending pathways during the flexor phase promotes an increase in intensity of this phase and a decrease in intensity of the "extensor" phase. Electrical activation of the Deiters nucleus increases intensity of the extensor phase and decreases that of the "flexor" phase. Possible principles of the suprasegmental correction of the locomotor generator activity are discussed.