Backward propagation of otoacoustic emission in the cochlea

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations

Abstract

Otoacoustic emissions have been commonly believed to be generated in the cochlea and emitted through backward-traveling waves. A recent study (Ren, 2004), however showed that there is no detectable backward traveling wave and that the stapes vibrates earlier than the basilar membrane (BM) at the emission frequency. These findings indicate that a cochlear-fluid compression wave is responsible for backward propagation of the emissions. This study contradicts with a widely accepted view that the delay of the otoacoustic emissions is approximately two times the forward traveling wave delay. In this study, the emission was measured in the ear canal, at the stapes, and at different locations on the BM. It was found that the slope of the phase-frequency curve measured from an apical location is always steeper than that measured from basal locations. Derived from the distance between two measured locations and their phase difference, the propagation velocity demonstrates that the BM vibration at the emission frequency propagates from base to apex through the observed region. Moreover, the emission group delay measured at the stapes is less than twice the traveling wave delay.

Original languageEnglish (US)
Title of host publicationAuditory Mechanisms
Subtitle of host publicationProcesses and Models - Proceedings of the 9th International Symposium
EditorsAlfred L. Nuttall, Tianying Ren, Peter Gillespie, Karl Grosh, Egbert de Boer
PublisherWorld Scientific Publishing Co. Pte Ltd
Pages79-85
Number of pages7
ISBN (Electronic)9812568247, 9789812568243
StatePublished - 2005
Event9th International Mechanics of Hearing Workshop on Auditory Mechanisms: Processes and Models, MoH 2005 - Portland, United States
Duration: Jul 23 2005Jul 28 2005

Publication series

NameAuditory Mechanisms: Processes and Models - Proceedings of the 9th International Symposium

Conference

Conference9th International Mechanics of Hearing Workshop on Auditory Mechanisms: Processes and Models, MoH 2005
CountryUnited States
CityPortland
Period7/23/057/28/05

ASJC Scopus subject areas

  • Biotechnology
  • Biomedical Engineering

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