Cerebellar cortex ablation releases deep cerebellar nuclei of monosynaptic inhibition from Purkinje cells. Therefore, it strengthens excitatory influence from Interpositus Nucleus [IN] upon Red Nucleus [RN}, which results in much higher lacilitation of the rubro-spinal neurons. This causes a big increase of spontaneous discharge rate. and eliminates brakes of discharges from responses generated by somatosensory stimuli. These two changes destroy content and timing of feedback infennation flowing through the spine-cerebello-rubro-spinal loop. This false bias ol'the feedback information. very important for fast postural adjustment and coordination ol'ongoing movements executed by central motor pro am, may at least in part be responsible for abnormal motor behavior evo ed by cerebellar damage. Hemieerebellectomy resulted in dramatically reduced spontaneous activity and responses to limb stimulation because of severing a major input to the red nucleus from deep cerebellar nuclei. Due to direct somatoscnsor input to magnocellular Red Nucleus (meRN] from the spinal cord that bypassed te eerebisllum1 the latency of response to limb stimulation was not changed and the narrower receptive fields were still present.