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Perceptual consequences of "hidden" hearing loss
Christopher J Plack1, Daphne Barker2, Garreth Prendergast2
1University of Manchester, UK chris.plack@manchester.ac.uk.
Trends in Hearing
|September 11, 2014
Summary
Noise exposure and aging can cause hidden hearing loss, damaging auditory nerve fibers. This condition, undetectable by standard tests, may explain speech and temporal processing issues in individuals with normal hearing.
Area of Science:
- Auditory Neuroscience
- Ototolaryngology
- Speech and Hearing Sciences
Background:
- Noise exposure and aging can lead to selective loss of high-threshold auditory nerve fibers.
- This cochlear neuropathy, termed 'hidden hearing loss,' is not detected by standard audiometric thresholds.
- Hidden hearing loss may contribute to perceptual deficits in individuals with clinically normal hearing.
Purpose of the Study:
- To investigate the link between noise exposure, cochlear neuropathy, and perceptual difficulties.
- To explore the role of aging in auditory nerve fiber loss and its perceptual consequences.
- To establish hidden hearing loss as a significant health concern.
Main Methods:
- Animal experiments demonstrating noise-induced auditory nerve fiber loss.
- Analysis of human temporal bone studies.
- Auditory brainstem response (ABR) measurements, including Wave I, to assess cochlear neuropathy.
Main Results:
- Noise exposure causes selective loss of high-threshold auditory nerve fibers without affecting absolute sensitivity.
- Aging also contributes to auditory nerve fiber loss.
- Evidence suggests hidden hearing loss is common in humans and impacts temporal processing.
Conclusions:
- Hidden hearing loss is a prevalent condition linked to noise exposure and aging.
- It may underlie speech and temporal processing deficits in individuals with normal audiometric thresholds.
- Further research is crucial to understand the full scope and implications of hidden hearing loss.
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