A Component of Stimulus-Frequency Otoacoustic Emissions Evoked due to Perturbation of Nonlinear Force in a Cochlear Model

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21230%2F24%3A00374888" target="_blank" >RIV/68407700:21230/24:00374888 - isvavai.cz</a>

Alternative codes found

RIV/68407700:21340/24:00374888

Result on the web

<a href="https://doi.org/10.1063/5.0189467" target="_blank" >https://doi.org/10.1063/5.0189467</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/5.0189467" target="_blank" >10.1063/5.0189467</a>

Result language

angličtina

Original language name

A Component of Stimulus-Frequency Otoacoustic Emissions Evoked due to Perturbation of Nonlinear Force in a Cochlear Model

Original language description

Stimulus-frequency otoacoustic emissions (SFOAEs) are evoked by a single tone presented into the ear. The emissions are generated by reflection of a forward traveling wave (TW) on localized irregularities in the impedance along the basilar membrane (BM). The strongest wavelets are reflected from the place where the TW reaches its largest amplitude. Since the irregularities are localized in fixed places along the basilar membrane, the latency of the SFOAE phase can be used to estimate delay of cochlear filters. We used an iterative approach of Shera et al. [JASA (2005) 118:287-313] to obtain an analytical solution for SFOAEs in a nonlinear two-dimensional cochlear model. The solution allowed for decomposition of a reflection component and a component due to perturbation of the nonlinear force. The nonlinear force which in the smooth cochlea may reflect the forward TW backwards [Talmadge et al., JASA (2000) 108, 2911-2931], is perturbed due to irregularities. The perturbed nonlinear force in the model generates an SFOAE component with latency comparable with the latency of the component due to reflection. This means that although the component is evoked due to nonlinear force, it has a comparable (long) latency to the SFOAE component due to reflection. The amplitude of this component due to perturbation of the nonlinear force grows as the amplitude of irregularities increases. In addition, the component amplitude also grows with the tone intensity. The growth is determined by the amplitude of the nonlinear force. It is almost cubic at the lowest intensities and quickly saturates at levels above about 40 dB SPL (the intensity is determined by the position of the compressive nonlinearity in the input/output function of the basilar membrane displacement). An interesting result is that the nonlinear component partly cancels the reflection component because its phase is shifted by approximately 0.5 cycles, independent of stimulus intensity and frequency. As the level increases, the component due to perturbation reaches an amplitude comparable to the component due to coherent reflection, especially in the portions of SFOAEs with the longest latencies. The destructive interference between the components due to perturbation of the nonlinear force and coherent reflection emphasizes shorter latency wavelets in the overall SFOAEs as stimulus intensity increases and contributes to the saturation of SFOAE amplitude reported, for example, in human experimental data of Abdala and Kalluri [JASA (2017) 142, 812-824].

Czech name

—

Czech description

—

Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

10307 - Acoustics

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Nonlinearity and Hearing: Advances in Theory and Experiment - Proceedings of the 14th International Mechanics of Hearing Workshop

ISBN

9780735448445

ISSN

1551-7616

e-ISSN

1551-7616

Number of pages

7

Pages from-to

"030014-1"-"030014-7"

Publisher name

American Institute of Physics

Place of publication

New York

Event location

Helsingør

Event date

Jul 24, 2022

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

001226934800026