Abstract:With 200 SEPs of normal human subjects, the differences in the Group Mean SEP between sexes were denned, removing those attributable to the peripheral factor, the statures.The differences in baseline amplitude in the sections roughly 1) between 29–110 msec, where there were the most remarkable differences in the waveform of the Group Mean SEP, between P2and N6, with a high convex arch peaking at P4(80 msec) for females but not for males, 2) around 320 msec, and 3) behind 400 msec in latency, were verified, not attributable to the different statures, and might be the central origin.With Scaled SEPs, which were converted from SEPs by the Amplitude Scaling, results similar to those with the unsealed SEPs were obtaine