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Dependence of the DPOAE amplitude pattern on acoustical biasing of the cochlear partition

journal contribution
posted on 2023-06-08, 07:12 authored by Andrei N Lukashkin, Ian J Russell
Distortion product otoacoustic emissions (DPOAEs) were recorded from guinea pigs in response to simultaneous increases in the levels of high frequency primary tones in the presence of a low frequency biasing tone of 30 Hz at 120 dB SPL. The DPOAE amplitudes plotted as functions of the biasing tone phase angle show distinctive repeatable minima, which are identical to the amplitude notches observed for the distortion products at the output of a single saturating non-linearity. The number of the amplitude minima grows with increasing order of the DPOAE, a feature that is also reproduced by the model. The model of DPOAE generation due to a single saturating non-linearity does not explain the experimentally observed asymmetry of the response of the DPOAEs to rising and falling half cycles of the biasing tone. This asymmetry is attributed to a hypothetical mechanism, which adjusts the operating point of the outer hair cell¿s mechanoelectrical transducer. Experimental data were consistent with a hypothesis that, for the parameters of stimulation used in this study, both lower and upper sideband DPOAEs are dominated by emission generated from a single and spatially localized place in the cochlea.

History

Publication status

  • Published

Journal

Hearing Research

ISSN

0378-5955

Issue

1-2

Volume

203

Page range

45-53

Pages

9.0

Department affiliated with

  • Biology and Environmental Science Publications

Notes

Principal author

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

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