[Synaptic responses of neurons of the red nucleus of the alert cat to stimulation of the sensomotor area of the cortex and the nucleus interpositus of the cerebellum].

Postsynaptic potentials of the red nucleus neurons evoked by stimulation of the cortical sensomotor region and the cerebellar nucleus interpositus were studied in chronic experiments on awake cats by means of intracellules revording. Rubro-spinal neurons identified by their antidromic activation in response to the stimulation. A decrease of the critical depolarization level was a specific feature for mono- and polysynaptic responses of the red nucleus neurons in alert animals. Isolated EPSPs, therefore, were rarely recorded as well as a great number of polysynaptic potentials. Burst discharges of rubro-spinal neurons and intensive activity of the red nucleus interneurons, were observed.