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The objective estimation of loudness discomfort level using auditory brainstem evoked responses
A R Thornton1, L Yardley, G Farrell
1MRC Institute of Hearing Research, Royal South Hants Hospital, Southampton, Hampshire, England.
Scandinavian Audiology
|January 1, 1987
Summary
Objective estimation of loudness discomfort level (LDL) is possible in children using auditory brainstem response (ABR) wave V latency. The slope of the wave V latency/intensity function accurately predicts LDL, aiding hearing aid fitting.
Area of Science:
- Audiology
- Neuroscience
- Hearing Aid Technology
Background:
- Loudness discomfort level (LDL) is crucial for hearing aid fitting.
- Young children cannot reliably provide subjective LDL judgments.
- Objective measures are needed to determine LDL in pediatric populations.
Purpose of the Study:
- To investigate the relationship between auditory brainstem response (ABR) wave V latency and subjective loudness.
- To determine if objective estimation of LDL is feasible in children.
- To develop a predictive model for LDL using ABR measurements.
Main Methods:
- ABR recordings were obtained from normally hearing and cochlear-impaired subjects.
- Stimulus intensities ranged from subjective LDL down to 30 dB below LDL.
- The wave V latency/intensity function and its slope were analyzed.
Main Results:
- The wave V latency/intensity function slope correlated highly with subjective LDL.
- A predictive model for LDL was derived from normally hearing subjects.
- The model accurately predicted LDL in cochlear-impaired subjects (+/- 5 dB).
Conclusions:
- The slope of the ABR wave V latency/intensity function provides an objective estimate of LDL.
- This objective method is valid across various degrees and profiles of hearing loss.
- The derived model aids in accurate hearing aid fitting for children.