Effects of geometry and cochlear loads on tectorial membrane traveling waves

Jonathan B. Sellon, Roozbeh Ghaffari, Dennis M. Freeman*

*Corresponding author for this work

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

Abstract

It has been suggested that the decay constants of tectorial membrane (TM) traveling waves contribute to differences in the tuning of Tectb -/- mutant mice, wild-Type mice, and humans. However, the experiments underlying these results were obtained in vitro, in the absence of cochlear loads. In this work, we analyze effects of cochlear loads on TM traveling waves using a viscoelastic model. Results demonstrate that hair bundle stiffness has little effect on TM waves, the limbal attachment tends to increase the wavelength of TM waves, and viscous loss to subtectorial fluid tends to decrease the wave decay constant. To understand how the TM is able to support traveling waves despite these loads we examined how TM wave decay constants depend on thickness of the TM. We observe that increasing TM thickness tends to moderate all effects of cochlear loads and that as TM thickness increases, the wave decay constant approaches an asymptotic limit that is independent of cochlear loads. For material properties corresponding to both the apical and basal turns of the mouse TM, the asymptotic limit in decay constant is achieved at roughly the physiological thickness-suggesting an evolutionary pressure for the TM to be just thick enough to allow for wave propagation in the presence of subtectorial fluid.

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

Sellon, J. B., Ghaffari, R., & Freeman, D. M. (2018). Effects of geometry and cochlear loads on tectorial membrane traveling waves. In C. Bergevin, & S. Puria (Eds.), To the Ear and Back Again - Advances in Auditory Biophysics: Proceedings of the 13th Mechanics of Hearing Workshop [040006] (AIP Conference Proceedings; Vol. 1965). American Institute of Physics Inc.. https://doi.org/10.1063/1.5038466