Impedances of the inner and middle ear estimated from intracochlear sound pressures in normal human temporal bones

Hearing Research
Darcy L FrearHideko Heidi Nakajima

Abstract

For almost a decade, we have measured intracochlear sound pressures evoked by air conducted (AC) sound presented to the ear canal in many fresh human cadaveric specimens. Similar measurements were also obtained during round window (RW) mechanical stimulation in multiple specimens. In the present study, we use our accumulated data of intracochlear pressures and simultaneous velocity measurements of the stapes or RW to determine acoustic impedances of the cochlear partition, RW, and the leakage paths from scala vestibuli and scala tympani, as well as the reverse middle ear impedance. With these impedances, we develop a computational lumped-element model of the normal ear that illuminates fundamental mechanisms of sound transmission. To calculate the impedances for our model, we use data that passes strict inclusion criteria of: (a) normal middle-ear transfer function defined as the ratio of stapes velocity to ear-canal sound pressure, (b) no evidence of air within the inner ear, and (c) tight control of the pressure sensor sensitivity. After this strict screening, updated normal means, as well as individual representative data, of ossicular velocities and intracochlear pressures for AC and RW stimulation are used to calculate imp...Continue Reading

Citations

May 3, 2019·The Journal of the Acoustical Society of America·Peter Bowers, John J Rosowski
Jan 3, 2020·The Journal of the Acoustical Society of America·Jing ZhangZhushi Rao
Apr 3, 2020·The Journal of the Acoustical Society of America·Lin XueXinsheng Huang
Sep 2, 2018·Journal of the Association for Research in Otolaryngology : JARO·Christof StiegerHideko Heidi Nakajima
Dec 1, 2020·Computer Methods in Biomechanics and Biomedical Engineering·Yu ZhaoXinsheng Huang
Oct 13, 2020·Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology·Stefan RauferHannes Maier
Jan 4, 2021·Hearing Research·Lukas GrafChristof Stieger
Jan 12, 2021·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Lin XueXinsheng Huang
May 5, 2021·The Journal of the Acoustical Society of America·Hamid Motallebzadeh, Sunil Puria
Jul 8, 2021·Computer Methods in Biomechanics and Biomedical Engineering·Houguang LiuXinsheng Huang

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