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Stimulus frequency otoacoustic emissions and cochlea function

Brass, David Neil; (1995) Stimulus frequency otoacoustic emissions and cochlea function. Doctoral thesis (Ph.D), UCL (University College London). Green open access

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Abstract

In this thesis a generalised energy flow model of the cochlea is presented. Stimulus frequency otoacoustic emission (SFOAE) suppression measurements are made on human ears. Some of these results are used to demonstrate the utility of the generalised cochlea model. Specifically, it is shown how the SFOAE results can be explained in terms of the generalised model. The technique for the measurement of SFOAEs is critically examined. Both the theory of measurement and the equipment used are described in detail. The relationship between the results of the measurements and SFOAEs is analysed. Various aspects of the SFOAE measurements are presented: characteristics of the SFOAEs are compared to those of transient evoked OAEs measured in the same ear; the effect of varying the frequency of the second, suppressing tone necessary to measure SFOAEs is examined; and, it is shown that when the suppressor and stimulus tones are of different frequencies then both SFOAEs and distortion product OAEs can be measured simultaneously. Characteristics of the suppression of SFOAEs by another tone are measured in detail. The general characteristics of SFOAE suppression are measured at different levels and frequencies of stimulus, and in different ears. These SFOAE suppression results exhibit qualitatively similar characteristics as neural and psychophysical suppression results presented in the literature. A simplified model of the suppression process, based on a generalised energy flow model of the cochlea, is presented. This model is shown to predict suppression results that are qualitatively similar to those measured by SFOAE suppression.

Type: Thesis (Doctoral)
Qualification: Ph.D
Title: Stimulus frequency otoacoustic emissions and cochlea function
Open access status: An open access version is available from UCL Discovery
Language: English
Additional information: Thesis digitised by ProQuest.
Keywords: Health and environmental sciences; Cochlea
URI: https://discovery.ucl.ac.uk/id/eprint/10098044
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