Geometric Requirements for Tectorial Membrane Traveling Waves in the Presence of Cochlear Loads
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Geometric Requirements.pdf
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Author(s)
Sellon, Jonathan Blake
Ghaffari, Roozbeh
Freeman, Dennis M.
Date Issued
February 2017
Journal
Biophysical Journal
Publisher
Elsevier
Citation
Sellon, Jonathan B. et al. “Geometric Requirements for Tectorial Membrane Traveling Waves in the Presence of Cochlear Loads.” Biophysical Journal 112, 6 (March 2017): 1059–1062 © 2017 Biophysical Society
Version
Final published version
Abstract
Recent studies suggest that wave motions of the tectorial membrane (TM) play a critical role in determining the frequency selectivity of hearing. However, frequency tuning is also thought to be limited by viscous loss in subtectorial fluid. Here, we analyze effects of this loss and other cochlear loads on TM traveling waves. Using a viscoelastic model, we demonstrate that hair bundle stiffness has little effect on TM traveling waves calculated with physiological parameters, that the limbal attachment can cause small (<20%) increases in TM wavelength, and that viscous loss in the subtectorial fluid can cause small (<20%) decreases in TM wave decay constants. However, effects of viscous loss in the subtectorial fluid are significantly increased if TM thickness is decreased. In contrast, increasing TM thickness above its physiological range has little effect on the wave, suggesting that the TM is just thick enough to maximize the spatial extent of the TM traveling wave.
MIT Department
Harvard University--MIT Division of Health Sciences and Technology
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Research Laboratory of Electronics
Terms of Use
Creative Commons Attribution-NonCommercial-NoDerivs License
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DOI of Published Version
https://doi.org/10.1016/j.bpj.2017.02.002
