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Noise and medial olivocochlear system in humans
L Collet1, A Morgon, E Veuillet
1Laboratoire d'explorations fonctionnelles ORL, Pavillon U, Hôpital Edouard Herriot, Lyon, France.
Acta Oto-Laryngologica
|January 1, 1991
Summary
Evoked otoacoustic emissions (EOAE) were stronger in noise-induced hearing loss (NIHL) than sensorineural hearing loss (SNHL). This difference in EOAE intensity is not linked to the olivocochlear feedback system in either hearing loss group.
Area of Science:
- Audiology
- Otoacoustic Emissions
- Hearing Loss Research
Background:
- Evoked otoacoustic emissions (EOAE) assess cochlear outer hair cell function.
- The medial olivocochlear (MOC) system modulates cochlear sensitivity.
- Understanding differences between noise-induced hearing loss (NIHL) and sensorineural hearing loss (SNHL) is crucial.
Purpose of the Study:
- To compare EOAE intensity and MOC system function in NIHL and SNHL.
- To investigate the relationship between temporary threshold shifts (TTS) and MOC feedback in NIHL.
Main Methods:
- Performed EOAE and sound-evoked olivocochlear feedback measurements.
- Studied 200 subjects: 109 with NIHL and 91 with SNHL.
- Analyzed correlations between TTS and MOC feedback in the NIHL group.
Main Results:
- EOAE intensity was significantly greater in the NIHL group compared to the SNHL group.
- No significant difference in sound-evoked olivocochlear feedback was observed between the NIHL and SNHL groups.
- No correlation was found between TTS and sound-olivocochlear feedback in subjects with NIHL.
Conclusions:
- The increased EOAE intensity in NIHL is likely independent of the medial olivocochlear system.
- Further research is needed to understand the mechanisms underlying EOAE differences in various hearing loss types.
- The MOC system's role in NIHL, particularly concerning temporary threshold shifts, requires additional investigation.