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

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 p...

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Bibliographic Details
Published in:Hearing research 2005-05, Vol.203 (1), p.45-53
Main Authors: Lukashkin, Andrei N., Russell, Ian J.
Format: Article
Language:English
Subjects:
Acoustic Stimulation
Animals
Biological and medical sciences
Cochlea - physiology
Cochlear mechanics
Ear and associated structures. Auditory pathways and centers. Hearing. Vocal organ. Phonation. Sound production. Echolocation
Fundamental and applied biological sciences. Psychology
Guinea Pigs
Hair cell transducer
Models, Biological
Nonlinear Dynamics
Otoacoustic emissions
Otoacoustic Emissions, Spontaneous
Perceptual Distortion
Vertebrates: nervous system and sense organs
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Summary: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.
ISSN:0378-5955
1878-5891
DOI:10.1016/j.heares.2004.11.011