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Hidden cochlear impairments.

Guang-Di Chen1

  • 1Center for Hearing and Deafness, State University of New York at Buffalo, 137 Cary Hall, 3435 Main Street, Buffalo, NY 14214, USA.

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|December 19, 2018
PubMed
Summary
This summary is machine-generated.

Pure tone audiometry may not detect certain cochlear injuries. Hidden damage to inner ear components can occur without noticeable hearing loss, potentially impacting auditory processing and increasing vulnerability.

Keywords:
Hidden hearing lossIHC damageOHC damageSynaptopathy

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Area of Science:

  • Auditory Neuroscience
  • Otoacoustic Emissions
  • Hearing Science

Background:

  • Pure tone audiometry is standard for identifying hearing loss.
  • Normal audiograms are assumed to indicate normal hearing.
  • Auditory deficits in individuals with normal audiograms are often attributed to central issues.

Purpose of the Study:

  • To investigate whether pure tone audiometry accurately reflects cochlear status.
  • To review types of cochlear damage in animal models that do not cause overt hearing loss.
  • To understand the implications of "hidden" cochlear impairments.

Main Methods:

  • Review of existing literature on cochlear damage in laboratory animals.
  • Analysis of three distinct types of cochlear impairment.
  • Examination of the functional consequences of these impairments.

Main Results:

  • Three types of cochlear damage (IHC loss, ANF synapse damage, OHC loss) may not manifest as hearing loss on audiograms.
  • Central gain enhancement can compensate for reduced peripheral auditory sensitivity.
  • Hidden cochlear impairments can increase vulnerability and disrupt central auditory processing.

Conclusions:

  • Pure tone audiometry may fail to detect specific cochlear injuries.
  • Subtle cochlear damage can exist despite normal hearing test results.
  • These "hidden" deficits may have long-term consequences for auditory function and cochlear health.