Central transmission time differences in the auditory brainstem response as a function of sex, age, and ear of...

Averaged auditory brainstem responses (ABRs) to monaural clicks were recorded from twenty-nine men and women and twenty children. Differences in the wave I to wave V transmission time, and wave I to wave III transmission time as a function of ear of stimulation and reference, sex, size and age were investigated. The wave I-V transmission time was shorter for the women compared to the men. Individual wave latencies were compared and the transmission time difference was found to be due to small, incremental differences between successive waves rather than to one particular wave component. Size differences, as measured by nasion-inion length and subject height, did not correlate to the transmission time difference and did not appear to contribute to the sex difference. An ear of stimulation difference was found in the women's group. The sex difference in transmission time was seen in the children's data, but the difference was not significant. Thus, sex differences, age differences, and ear of reference differences are seen in ABR transmission times.