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  • Title: Continued maturation of the click-evoked auditory brainstem response in preschoolers.
    Author: Spitzer E, White-Schwoch T, Carr KW, Skoe E, Kraus N.
    Journal: J Am Acad Audiol; 2015 Jan; 26(1):30-5. PubMed ID: 25597458.
    Abstract:
    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.
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