Cochlear tuning and DPOAE dependence on the primary tone frequency ratio

Renata Sisto*, Uzma Shaheen Wilson, Sumitrajit Dhar, Arturo Moleti

*Corresponding author for this work

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

Abstract

The 2f1-f2 distortion product otoacoustic emission (DPOAE) response, measured as a function of the primary frequency ratio r shows a bell-shaped curve, which depends, in principle, on the interplay among three factors: The dependence on r of the overlap between the basilar membrane (BM) responses to the primary tones, linear interference between the wavelets coming from spatially distributed sources, and nonlinear suppression phenomena. This issue has been investigated using a numerical nonlinear cochlear model, and an analytical linear cochlear model in which DPOAEs were generated as nonlinear perturbations, to assess the reliability of a method for estimating cochlear tuning from the width of the experimental DPOAE level vs. ratio function. A fixed-f2 acquisition paradigm was used, varying r continuously in the range 1-1.5, for two f2 values (1250 and 5000 Hz). The resulting experimental "spectra" have been time-frequency analyzed to select the distortion component, and compared with the models' simulations. The experimental results are well matched by both models, suggesting that the main features of the DPOAE vs. ratio curve are quite independent of nonlinear suppression phenomena. From the same model simulations, the basilar membrane BM tuning can be directly estimated. A strong linear correlation was found in the model between the width of the BM response and that of the DPOAE level vs. ratio relation, supporting the reliability of estimates of cochlear tuning obtained from the evaluation of the DP versus ratio experimental curves.

Original languageEnglish (US)
Title of host publicationTo the Ear and Back Again - Advances in Auditory Biophysics
Subtitle of host publicationProceedings of the 13th Mechanics of Hearing Workshop
EditorsChristopher Bergevin, Sunil Puria
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735416703
DOIs
StatePublished - May 31 2018
Event13th Mechanics of Hearing Workshop: To the Ear and Back Again - Advances in Auditory Biophysics, MoH 2017 - St. Catharines, Canada
Duration: Jun 19 2017Jun 24 2017

Publication series

NameAIP Conference Proceedings
Volume1965
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other13th Mechanics of Hearing Workshop: To the Ear and Back Again - Advances in Auditory Biophysics, MoH 2017
CountryCanada
CitySt. Catharines
Period6/19/176/24/17

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Sisto, R., Wilson, U. S., Dhar, S., & Moleti, A. (2018). Cochlear tuning and DPOAE dependence on the primary tone frequency ratio. In C. Bergevin, & S. Puria (Eds.), To the Ear and Back Again - Advances in Auditory Biophysics: Proceedings of the 13th Mechanics of Hearing Workshop [170002] (AIP Conference Proceedings; Vol. 1965). American Institute of Physics Inc.. https://doi.org/10.1063/1.5038535