The effect of somatosensory evoked potentials on the onset of voluntary movement

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The purpose of the study was to investigate the sequential changes of somatosensory evoked potentials (SEPs) accompanying voluntary movement, in comparison of self-voluntary movement and CNV-paradigm. The SEPs, Movement related cortical potentials and CNVs were recorded through the epoch preceding and accompanying movement of right thumb. Cerebral N20 and N18 were investigated according to the temporal relationship between the onset of movement and 7 epoch (500 msec) set by computer under the condition of stimulating the median nerve of right wrist. SEPs were recorded in 16 (experimental (1)) and 18 (experimental (2)) subjects and averaged in 7 successive epochs extending from 2.0 sec before onset of EMG to 0.5 sec after offset of EMG. The attenuation of both N20, i.e, gating, were clearly observed in epoch pre- and post-movement and was greatest in the epoch during movement, but that of N18 was not clear (experimental (1)). The change of N20 elicited by stimulating central nerve was different from that of N18. However, the difference between both components was not shown under the condition of stimulairig cutanuous (experimental (2)). From these findings, the gating is considered to be reflected the changes of afferent information processing at not central level but peripheral sites.