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Effect of stimulus level on the morphology of transient - evoked otoacoustic emission waveforms revealed by matching pursuit signal decomposition
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Attempts to estimate cochlear filter bandwidth using otoacoustic emissions: experiments and models
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Properties of volterra slices of otoacoustic emissions in normal-hearing humans obtained by using maximum length sequences of clicks
No full textNonlinear temporal interaction components of otoacoustic emissions (OAEs) may be investigated by presenting a stream of clicks in maximum length sequences. This yields responses, termed here Volterra slices, which are related to the Volterra kernels of the system. The aim of this study was to obtain normative data on Volterra slices over a range of click rates and stimulus levels. OAEs were recorded in 12 normally hearing adult ears at six rates and four click levels. In addition to the first order kernel, six slices from the Volterra slices of orders 2–5 were extracted from the recordings. It was found that higher order kernel slices could be reliably measured in all 12 ears tested and that they have properties that differ from those of the conventional OAEs. These findings may facilitate the study of cochlear function in both normal and pathological ears
Incorporation of an active feedback loop into the 'squirting wave'
No full textHTML or similar not available MenuWelcA model of the cochlear amplifier has recently been proposed, which involves symmetric Lloyd-Redwood (SLR) or "squirting" waves being propagated between the tectorial membrane and the rectilinear laminate in the cochlea (Bell and Fletcher, JASA, 116, 1016?1024, 2004). The stiffness of the laminate combined with the inertia of the fluid between these structures leads to a highly dispersive wave, which appears to give rise to resonances in the correct range of frequencies. One problem with this model is that the waves are highly damped by fluid viscosity. In this paper a model is proposed in which the motile action of the outer hair cells is incorporated into the dynamics. This provides an active feedback loop that can enhance the response of the system and thus drive fluid towards the inner hair cells, improving the overall sensitivity of the system and acting as a cochlear amplifier
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