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

Brain stem auditory evoked potentials have been recorded in 40 normal subjects aged 13--48 years, 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 less than 0.0005), the elongation increasing from 0.09 to 0.44 msec from wave III to VII. The female subjects have amplitudes significantly higher than male subjects, although the variations are very wide. No difference in latencies from tall versus short subjects is found, as well as no significant difference in latencies between subgroups of older and younger subjects of the material. It is found necessary to have different normal values for the two sexes.