We report the electrophysiological findings of the central and peripheral somatosensory pathways in 20 patients with olivopontocerebellar atrophy. Changes in sensory action potentials of the median nerve were observed in 14 patients and consisted of reduced sensory potential amplitudes associated in 10 cases with an increase in distal latencies. Sixteen out of 20 patients also showed changes in somatosensory evoked potentials after stimulation of the median nerve, consisting of decreased amplitude of N13 (13 cases) and N20 (16 cases) components, associated with increased N9-N13 interpeak latency in 9 and N13-N20 in 14 patients. The origin of these alterations is discussed.

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