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Frequency- and level-dependent changes in auditory brainstem responses (ABRS) in developing mice
Lei Song1, Joann McGee, Edward J Walsh
1Boys Town National Research Hospital, 555 North 30th Street, Omaha, Nebraska 68131, USA.
The Journal of the Acoustical Society of America
|April 29, 2006
Summary
Auditory brainstem response development in newborns shows significant maturation in the first few postnatal weeks. Adult-like hearing function is achieved by postnatal day 18, with rapid improvements in thresholds and latencies.
Area of Science:
- Neuroscience
- Auditory Neuroscience
- Developmental Neuroscience
Background:
- The auditory brainstem response (ABR) is a crucial electrophysiological measure for assessing auditory pathway function.
- Understanding the developmental trajectory of ABR is essential for identifying auditory processing disorders in infants.
- Previous research has indicated maturation of the auditory system postnatally, but detailed frequency-specific development requires further investigation.
Purpose of the Study:
- To quantitatively analyze the developmental changes in auditory brainstem response (ABR) based on stimulus frequency and intensity.
- To determine the age at which adult-like ABR characteristics are achieved.
- To elucidate the frequency-dependent maturation patterns of the auditory system.
Main Methods:
- Auditory brainstem response (ABR) was measured in subjects across different postnatal ages (P12-P36).
- Stimuli varied in frequency (ranging from low to high kHz) and intensity (dB SPL).
- Analysis focused on response thresholds, latencies, interpeak intervals, and wave amplitudes.
Main Results:
- Auditory sensitivity improved significantly from P12 to P18, with thresholds approaching adult levels by P18.
- Rapid maturation of response latencies and interpeak intervals occurred during the second and third postnatal weeks.
- Wave I amplitude maturation was non-monotonic, stabilizing around P36, and neonatal amplitude/latency-level functions were steeper than adults.
Conclusions:
- The auditory brainstem response (ABR) undergoes rapid development in the early postnatal period, with significant maturation by P18.
- Auditory function matures initially in the mid-frequency range, followed by simultaneous development in apical and basal frequency regions.
- These findings provide critical insights into the developmental timeline of the human auditory system and support specific developmental models.
