Developmental changes in ABR (recorded from a surface electrode as short latency evoked potentials) were studied in healthy human subjects ranging in age from newborn to six years. Data were collected on 278 occasions and the appearance of wave, latency, interpeak latency (IPL) and amplitude characteristics from wave I to V were analyzed. On the day of birth very few subjects showed any type of wave, but this situation changed rapidly with the passage of time, and became stable by the 4th day. For neonates, no significant changes were seen in the above measures except for changes in latency in III and IV after the 8th or 9th day. For neonates and infants, significant age effects were observed for all measures with the exception of wave appearance. Infants' II -V latencies and IPLs decreased as a function of age until the ages of 3-4 years. Amplitudes then increased until the ages of 5-6 years. These data were discussed mainly in terms of effects from spontaneous labor and the development of auditory brainstem pathways.
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