Activity of red nucleus rubrospinal neurons to electrical stimulation of cerebellar nucleus interpositus was studied in nembutalized cats. Facilitation of cerebello-rubral transmission was shown to take place in the majority of neurons whose focal potentials and EPSPs to paired and frequency stimulation of cerebellar nucleus interpositus were analyzed. The mentioned facilitation was found not to be caused by changes in presynaptic volleys. Discussed modification of the transmission efficiency was supposed to be determined by peculiarities of functioning of cerebellar synapses on red nucleus neurons.
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