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Updated: Apr 18, 2026
Infant Auditory Processing and Event-related Brain Oscillations
Published on: July 1, 2015
Continued maturation of the click-evoked auditory brainstem response in preschoolers
Emily Spitzer1, Travis White-Schwoch1, Kali Woodruff Carr1
1Department of Communication Sciences, Auditory Neuroscience Laboratory, www.brainvolts.northwestern.edu, Northwestern University, Evanston, IL.
Background:
Click-evoked auditory brainstem responses (ABRs) are a valuable tool for probing auditory system function and development. Although it has long been thought that the human auditory brainstem is fully mature by age 2 yr, recent evidence indicates a prolonged developmental trajectory.
Purpose:
The purpose of this study was to determine the time course of ABR maturation in a preschool population and fill a gap in the knowledge of development.
Research Design:
Using a cross-sectional design, we investigated the effect of age on absolute latencies, interwave latencies, and amplitudes (waves I, III, V) of the click-evoked ABR.
Study Sample:
A total of 71 preschoolers (ages 3.12-4.99 yr) participated in the study. All had normal peripheral auditory function and IQ.
Data Collection And Analysis:
ABRs to a rarefaction click stimulus presented at 31/sec and 80 dB SPL (73 dB nHL) were recorded monaurally using clinically-standard recording and filtering procedures while the participant sat watching a movie. Absolute latencies, interwave latencies, and amplitudes were then correlated to age.
Results:
Developmental changes were restricted to absolute latencies. Wave V latency decreased significantly with age, whereas wave I and III latencies remained stable, even in this restricted age range.
Conclusions:
The ABR does not remain static after age 2 yr, as seen by a systematic decrease in wave V latency between ages 3 and 5 yr. This finding suggests that the human brainstem has a continued developmental time course during the preschool years. Latency changes in the age 3-5 yr range should be considered when using ABRs as a metric of hearing health.
