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A linearly tapered box model of the cochlea

A linearly tapered box model of the cochlea
A linearly tapered box model of the cochlea
A box shape with constant area is often used to represent the complex geometry in the cochlea, although variation of the fluid chambers areas is known to be more complicated. This variation is account for here by an "effective area", given by the harmonic mean of upper and lower chamber area from previous measurements. The square root of this effective area varies linearly along the cochleae in the investigated mammalian species. This suggests the use of a linearly tapered box model, in which the fluid chamber width and height are equal, but decrease linearly along its length. The basilar membrane width is assumed to increase linearly along the model. An analytic form of the far-field fluid pressure difference due to basilar membrane motion is derived for this tapered model. The distributions of the passive basilar membrane response are calculated using both the tapered and uniform models and compared with human and mouse measurements. The discrepancy between the models is frequency-dependent and becomes small at low frequencies. The tapered model developed here shows a reasonable fit to experimental measurements, when the cochleae are cadaver or driven at high sound pressure level and provides a convenient way to incorporate cochlear geometrical variations.
Cochlear mechanics, fluid coupling, coupled response, tapered model
0001-4966
Ni, Guangjian
f6ddc112-7d81-403a-b97a-7ecbc8fd4e59
Sun, Luyang
f11eeb8b-51de-4c11-82ad-8811880dfd70
Elliott, Stephen
721dc55c-8c3e-4895-b9c4-82f62abd3567
Ni, Guangjian
f6ddc112-7d81-403a-b97a-7ecbc8fd4e59
Sun, Luyang
f11eeb8b-51de-4c11-82ad-8811880dfd70
Elliott, Stephen
721dc55c-8c3e-4895-b9c4-82f62abd3567

Ni, Guangjian, Sun, Luyang and Elliott, Stephen (2017) A linearly tapered box model of the cochlea. Journal of the Acoustical Society of America. (In Press)

Record type: Article

Abstract

A box shape with constant area is often used to represent the complex geometry in the cochlea, although variation of the fluid chambers areas is known to be more complicated. This variation is account for here by an "effective area", given by the harmonic mean of upper and lower chamber area from previous measurements. The square root of this effective area varies linearly along the cochleae in the investigated mammalian species. This suggests the use of a linearly tapered box model, in which the fluid chamber width and height are equal, but decrease linearly along its length. The basilar membrane width is assumed to increase linearly along the model. An analytic form of the far-field fluid pressure difference due to basilar membrane motion is derived for this tapered model. The distributions of the passive basilar membrane response are calculated using both the tapered and uniform models and compared with human and mouse measurements. The discrepancy between the models is frequency-dependent and becomes small at low frequencies. The tapered model developed here shows a reasonable fit to experimental measurements, when the cochleae are cadaver or driven at high sound pressure level and provides a convenient way to incorporate cochlear geometrical variations.

PDF JASA01294_R1_Manuscript_Accepted - Accepted Manuscript
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More information

Accepted/In Press date: 16 February 2017
Keywords: Cochlear mechanics, fluid coupling, coupled response, tapered model
Organisations: Inst. Sound & Vibration Research, Signal Processing & Control Grp, Education Hub

Identifiers

Local EPrints ID: 406184
URI: https://eprints.soton.ac.uk/id/eprint/406184
ISSN: 0001-4966
PURE UUID: 251093f4-781d-454a-ab9e-0088985c2752
ORCID for Guangjian Ni: ORCID iD orcid.org/0000-0002-9240-3020

Catalogue record

Date deposited: 10 Mar 2017 10:41
Last modified: 06 Jun 2018 12:25

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