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Negative-delay sources in distortion product otoacoustic emissions.
- Source :
-
Hearing Research . Mar2018, Vol. 360, p25-30. 6p. - Publication Year :
- 2018
-
Abstract
- Long-delay components showing a symmetrical pattern with positive and negative delays can be observed in the time-frequency representation (or in the inverse Fourier transform) of distortion product otoacoustic emissions. Positive-only phase-gradient delays are predicted by place-fixed backscattering mechanisms, such as coherent reflection due to roughness, whereas the nonlinear distortion wave-fixed mechanism should generate an almost null-delay component. The symmetrical delay pattern arises whenever spectral amplitude fluctuations are not fully correlated to phase fluctuations. An interpretation of this phenomenon is proposed, involving place-fixed modulation of the spectral strength of the wave–fixed nonlinear generator. Experimental data are shown in which these negative-delay sources are particularly strong, and further amplified by contralateral stimulation, suggesting that this effect could be dynamically enhanced. Analytical solutions of a linear 1-d transmission line model, in which cubic nonlinearity and roughness were added as small perturbations, have been used to test this hypothesis. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03785955
- Volume :
- 360
- Database :
- Academic Search Index
- Journal :
- Hearing Research
- Publication Type :
- Academic Journal
- Accession number :
- 128348395
- Full Text :
- https://doi.org/10.1016/j.heares.2017.12.011