The Effect of Ear Canal Orientation on Tympanic Membrane Motion and the Sound Field Near the Tympanic Membrane
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Author(s)
Ravicz, Michael
Guignard, Jérémie
Furlong, Cosme
Cheng, Jeffrey Tao
Rosowski, John J
Date Issued
April 2015
Journal
Journal of the Association for Research in Otolaryngology
Publisher
Springer US
Citation
Cheng, Jeffrey Tao et al. “The Effect of Ear Canal Orientation on Tympanic Membrane Motion and the Sound Field Near the Tympanic Membrane.” Journal of the Association for Research in Otolaryngology 16.4 (2015): 413–432.
Version
Author's final manuscript
Abstract
The contribution of human ear canal orientation to tympanic membrane (TM) surface motion and sound pressure distribution near the TM surface is investigated by using an artificial ear canal (aEC) similar in dimensions to the natural human ear canal. The aEC replaced the bony ear canal of cadaveric human temporal bones. The radial orientation of the aEC relative to the manubrium of the TM was varied. Tones of 0.2 to 18.4 kHz delivered through the aEC induced surface motions of the TM that were quantified using stroboscopic holography; the distribution of sound in the plane of the tympanic ring PTR was measured with a probe tube microphone. The results suggest that the ear canal orientation has no substantial effect on TM surface motions, but PTR at frequencies above 10 kHz is influenced by the ear canal orientation. The complex TM surface motion patterns observed at frequencies above a few kilohertz are not correlated with simpler variations in PTR distribution at the same frequencies, suggesting that the complex sound-induced TM motions are more related to the TM mechanical properties, shape, and boundary conditions rather than to spatial variations in the acoustic stimulus.
MIT Department
Harvard University--MIT Division of Health Sciences and Technology
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1007/s10162-015-0516-x
