Time-domain numerical solutions of a nonlinear active cochlear model forced by click stimuli are analyzed with a time-frequency wavelet technique to identify the components of the otoacoustic response associated with different generation mechanisms/places. Previous experimental studies have shown evidence for the presence of at least two components in the transient otoacoustic response: A long-latency response, growing compressively with increasing stimulus level, and a shorter-latency response, characterized by faster growth. The possible mechanisms for the generation of the two components are discussed using the results of the numerical simulations. The model is a one-dimensional (1-D) transmission line model with nonlinear and nonlocal active terms representing the anti-damping action of the “cochlear amplifier.” The dependence on the stimulus level of latency and level was measured for the different components of the response. The generation mechanisms/places of the different components were identified by varying the stimulus level and by turning off the cochlear roughness in well-defined cochlear regions. The results suggest that reflections from roughness coming from basal regions of the cochlea may give a relevant contribution to the early otoacoustic response, whereas nonlinear mechanisms seem to produce a much smaller additional contribution.

Moleti, A., Al Maamury, A., Bertaccini, D., Botti, T., Sisto, R. (2013). Generation place of the long- and short-latency components of transient-evoked otoacoustic emissions in a nonlinear cochlear model. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 133(6), 4098-4108 [10.1121/1.4802940].

Generation place of the long- and short-latency components of transient-evoked otoacoustic emissions in a nonlinear cochlear model

MOLETI, ARTURO;BERTACCINI, DANIELE;
2013-01-01

Abstract

Time-domain numerical solutions of a nonlinear active cochlear model forced by click stimuli are analyzed with a time-frequency wavelet technique to identify the components of the otoacoustic response associated with different generation mechanisms/places. Previous experimental studies have shown evidence for the presence of at least two components in the transient otoacoustic response: A long-latency response, growing compressively with increasing stimulus level, and a shorter-latency response, characterized by faster growth. The possible mechanisms for the generation of the two components are discussed using the results of the numerical simulations. The model is a one-dimensional (1-D) transmission line model with nonlinear and nonlocal active terms representing the anti-damping action of the “cochlear amplifier.” The dependence on the stimulus level of latency and level was measured for the different components of the response. The generation mechanisms/places of the different components were identified by varying the stimulus level and by turning off the cochlear roughness in well-defined cochlear regions. The results suggest that reflections from roughness coming from basal regions of the cochlea may give a relevant contribution to the early otoacoustic response, whereas nonlinear mechanisms seem to produce a much smaller additional contribution.
2013
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/07 - FISICA APPLICATA (A BENI CULTURALI, AMBIENTALI, BIOLOGIA E MEDICINA)
Settore MAT/08 - ANALISI NUMERICA
English
Con Impact Factor ISI
nonlinear active cochlear model; nonlinear active cochlear model;
Moleti, A., Al Maamury, A., Bertaccini, D., Botti, T., Sisto, R. (2013). Generation place of the long- and short-latency components of transient-evoked otoacoustic emissions in a nonlinear cochlear model. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 133(6), 4098-4108 [10.1121/1.4802940].
Moleti, A; Al Maamury, A; Bertaccini, D; Botti, T; Sisto, R
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/79729
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