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Nonlinear properties of otoacoustic emissions in normal and impaired hearing

Nonlinear properties of otoacoustic emissions in normal and impaired hearing
Nonlinear properties of otoacoustic emissions in normal and impaired hearing
Click-evoked otoacoustic emissions (CEOAEs) exhibit nonlinearities in amplitude and time domains. The first objective of this study was to investigate whether there is any correlation between the temporal and amplitude nonlinearities of CEOAEs in normals. Additionally there is evidence that pathology affects the normal cochlear nonlinearity. The second objective was to investigate whether pathology affects the temporal nonlinear components.
Conventional and maximum length sequence (MLS) CEOAEs were recorded in normal subjects and in patients with mild hearing loss. The slope of the input–output (I/O) function of the conventional CEOAE measured the amplitude nonlinearity. Two measures of temporal nonlinearity were the magnitude of the suppression that occurs with increase in stimulus rate and the amplitudes of the second and third order temporal interaction components (Volterra slices).
The amplitude nonlinearity is well correlated with both the magnitude of the rate suppression and the amplitudes of the Volterra slices. The ‘linear’ CEOAE amplitude showed no differences between the normal and patient groups but the differences in the Volterra slices were substantial. This suggests that the first sign of damage to the cochlea is that the system becomes more linear. Hence the Volterra slices may provide a sensitive measure of cochlear damage.
nonlinear systems, maximum length sequences, cochlear amplifier, otoacoustic emissions, volterra kernels, cochlear pathology
0378-5955
56-65
Thornton, A.R.D.
c521ce20-d056-4748-af28-e2293f3593d0
Lineton, B.
1ace4e96-34da-4fc4-bc17-a1d82b2ba0e2
Baker, V.J.
e8941e51-7115-400c-94e7-784fc3f1d95b
Slaven, A.
5d0c419e-70ce-4921-b238-265bc58b0827
Thornton, A.R.D.
c521ce20-d056-4748-af28-e2293f3593d0
Lineton, B.
1ace4e96-34da-4fc4-bc17-a1d82b2ba0e2
Baker, V.J.
e8941e51-7115-400c-94e7-784fc3f1d95b
Slaven, A.
5d0c419e-70ce-4921-b238-265bc58b0827

Thornton, A.R.D., Lineton, B., Baker, V.J. and Slaven, A. (2006) Nonlinear properties of otoacoustic emissions in normal and impaired hearing. Hearing Research, 219 (1-2), 56-65. (doi:10.1016/j.heares.2006.05.010).

Record type: Article

Abstract

Click-evoked otoacoustic emissions (CEOAEs) exhibit nonlinearities in amplitude and time domains. The first objective of this study was to investigate whether there is any correlation between the temporal and amplitude nonlinearities of CEOAEs in normals. Additionally there is evidence that pathology affects the normal cochlear nonlinearity. The second objective was to investigate whether pathology affects the temporal nonlinear components.
Conventional and maximum length sequence (MLS) CEOAEs were recorded in normal subjects and in patients with mild hearing loss. The slope of the input–output (I/O) function of the conventional CEOAE measured the amplitude nonlinearity. Two measures of temporal nonlinearity were the magnitude of the suppression that occurs with increase in stimulus rate and the amplitudes of the second and third order temporal interaction components (Volterra slices).
The amplitude nonlinearity is well correlated with both the magnitude of the rate suppression and the amplitudes of the Volterra slices. The ‘linear’ CEOAE amplitude showed no differences between the normal and patient groups but the differences in the Volterra slices were substantial. This suggests that the first sign of damage to the cochlea is that the system becomes more linear. Hence the Volterra slices may provide a sensitive measure of cochlear damage.

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More information

Published date: 2006
Keywords: nonlinear systems, maximum length sequences, cochlear amplifier, otoacoustic emissions, volterra kernels, cochlear pathology
Organisations: Human Sciences Group

Identifiers

Local EPrints ID: 46349
URI: http://eprints.soton.ac.uk/id/eprint/46349
ISSN: 0378-5955
PURE UUID: 301111bb-0067-4d9a-ab5d-439350eb72fc
ORCID for B. Lineton: ORCID iD orcid.org/0000-0003-4784-7762

Catalogue record

Date deposited: 19 Jun 2007
Last modified: 16 Mar 2024 03:31

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Contributors

Author: A.R.D. Thornton
Author: B. Lineton ORCID iD
Author: V.J. Baker
Author: A. Slaven

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