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Studies attempting to relate the abnormalities of the frontal N30 components of the somatosensory evoked potentials (SEPs) to motor symptoms in Parkinson's disease (PD) have shown contradictory results. We recorded the frontal and parietal SEPs to median nerve stimulation in 2 groups of PD patients: a group of 17 patients presenting the wearing-off phenomenon, and a group of 10 untreated PD patients...