Differences of latencies and amplitudes of brain stem evoked potentials in subgroups of a normal material

Abstract

Brain stem auditory evoked potentials were recorded in 40 normal subjects aged 13-48 yr, by stimulating monaurally with random stimulus interval. The male subjects have latencies of the waves III-VII, which are significantly longer than female subjects (P < 0.0005), the elongation increasing from 0.09-0.44 ms from wave III-VII. The female subjects have amplitudes significantly higher than male subjects, although the variations are very wide. No difference in latencies from tall vs. short subjects is found, and no significant difference exists in latencies between subgroups of older and younger subjects of the material. It is necessary to have different normal values for the 2 sexes.