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Influence of aging on medial olivocochlear system function.

Grażyna Lisowska1, Grzegorz Namyslowski1, Boguslawa Orecka1

  • 1Department of Otolaryngology, Medical University of Silesia, Zabrze, Poland.

Clinical Interventions in Aging
|June 25, 2014
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Summary

Aging diminishes the medial olivocochlear (MOC) system

Keywords:
MOC effectMOC inhibitionagecontralateral suppressionefferent suppressionmedial olivocochlear systemotoacoustic emissions

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Area of Science:

  • Auditory Neuroscience
  • Otoacoustic Emissions
  • Human Physiology

Background:

  • The influence of aging on medial olivocochlear (MOC) system function remains debated.
  • This study investigates age-related changes in MOC function in individuals with normal hearing.

Purpose of the Study:

  • To quantify age-related alterations in MOC system function.
  • To assess MOC effect on otoacoustic emissions across different age groups.

Main Methods:

  • Bilateral assessment of MOC effect using click-evoked otoacoustic emissions (CEOAE) and distortion product otoacoustic emissions (DPOAE).
  • Tested 146 healthy subjects aged 10-60 years with normal hearing thresholds and normal tympanograms.
  • MOC inhibition assessed via changes in OAE levels during contralateral broadband noise stimulation.

Main Results:

  • The MOC effect was weakest in the oldest age group (41-60 years) across most tested frequencies.
  • A significant positive correlation was found between OAE levels and MOC effect size.
  • Older individuals showed decreased OAE suppression and increased OAE enhancements.

Conclusions:

  • Medial olivocochlear (MOC) system strength declines with age in normally hearing individuals.
  • This age-related decline is evident in reduced OAE suppression and increased OAE enhancements, particularly at high frequencies.
  • Findings suggest aging impacts efferent auditory system function.