Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 43 for “"Otoacoustic emissions"”.
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Heritability of Spontaneous Otoacoustic Emissions
Spontaneous otoacoustic emissions (SOEs) are narrow-band signals emitted from the cochlea and measured in the ear canal with a sensitive microphone. Because these emissions are correlated with sex and because sex is genetically determined, Bilger et al. (1990) hypothesized that SOEs were inherited. …
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Modelling the cochlear origins of distortion product otoacoustic emissions
Distortion product otoacoustic emissions (DPOAEs) arise within the cochlea in response to two<br/>stimulus tones (f1 and f2) at frequencies such as 2f1 ? f2 and 2f2 ? f1. Each DPOAE derives from two<br/>contributing mechanisms within the cochlea: a distributed distortion source and a reflection …
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Fine structure in distortion product otoacoustic emissions and auditory perception
Otoacoustic emissions (OAE) are emitted from a healthy ear and can be recorded in the sealed ear canal. The measurement of otoacoustic emissions is well established as a tool for hearing screening. However, until now OAE measurements allow no precise individual prediction of hearing status. The aim …
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Using otoacoustic emissions to evaluate efferent auditory function in humans
… system can be investigated non-invasively using otoacoustic emissions (OAEs). However, how OAEs can best be used to evaluate efferent function, the pitfalls associated with such measurements, as well as the relationship between OAEs and perception are not fully understood. </p> <p>This …
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Interpreting otoacoustic emissions in humans : evidence for multiple generating mechanisms
Healthy ears generate sounds known as otoacoustic emissions that can be evoked and measured in the ear-canal using small, low-noise microphones. The ability to measure acoustic signals that originate within the cochlea provides noninvasive access to what in humans is an almost inaccessible organ. …
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Properties of maximum length sequence and nonlinear volterra slice otoacoustic emissions
Evoked otoacoustic emissions (EOAEs) are produced by the cochlea and provide anobjective and non-invasive measure of cochlear function. A new technique, based onMaximum Length Sequences (MLSs) enables stimulus rates of up to 5000 clicks/s to beused, and gives increased speed and sensitivity of …
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Longitudinal outcomes of distortion product otoacoustic emissions and wideband reflectance in infants
… loss characterized by the absence of measurable otoacoustic emissions (OAEs) but normal sensorineural hearing. This transient situation interferes with the process of universal newborn hearing screening and identification.</p> <p>The purpose of this prospective, longitudinal study was to describe …
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Using otoacoustic emissions to measure the transmission matrix of the middle-ear
… transmission matrix of the middle-ear using otoacoustic emissions. The experiment builds on previous work that uses distortion product otoacoustic emissions (DPOAEs) as an intracochlear sound source to drive the middle-ear in reverse. This technique eliminates the complications introduced by …
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A Model of the Production of Spontaneous Otoacoustic Emissions in the Tokay Gecko
… environment. These sounds, known as spontaneous otoacoustic emissions, are the most striking proof of the existence of an active process within the ear. This active process originates in hair cells, the sensory receptors of the inner ear; by augmenting the energy contained in sound, it improves …
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Comparative approaches to otoacoustic emissions : towards and understanding of why the ear emits sound
… the ear also emits sound as well. These otoacoustic emissions (OAEs) have been developed extensively for clinical applications (healthy ears emits while impaired ones do not), though their full potential has yet to be realized. Much of the effort gone into understanding OAEs has been …
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Using stimulus frequency otoacoustic emissions to study basic properties of the human medial olivocochlear reflex
… of the reflex in humans using stimulus-frequency-otoacoustic-emissions (SFOAEs) that address the following issues: (1) The relative strengths of ipsilateral and contralateral reflex pathways (2) The reflex time-course (3) The response of the reflex to amplitude modulated (AM) noise (4;) The …
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A distortion product otoacoustic emissions (DPOAE) assessment of cochlear function in tinnitus subjects with normal hearing sensitivity
… this percept. This study used distortion product otoacoustic emissions (DPOAEs) to evaluate the cochlear amplifier of 13 tinnitus subjects and 13 non-tinnitus subjects (matched by age, sex, and audiogram) across a broad range of frequencies and intensities. DPOAE magnitudes were measured for at …
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Distortion product otoacoustic emissions: towards reliable and valid early identification and monitoring of hearing in adults receiving ototoxic medication
… by the patient's state. Distortion product otoacoustic emissions (DPOAEs) at 2f1-f2 are a viable option, as it evaluates cochlear function, specifically the outer hair cells, which are affected first by ototoxic medication. Method: This thesis used a sequential study design aimed to …
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Medial olivocochlear efferent (MOC) effects on stimulus frequency otoacoustic emissions (SFOAEs) and auditory-nerve compound action potentials (CAP) in guinea pigs
In humans, SFOAEs can non-invasively assess MOC strength and, may predict the MOC reduction of damage from traumatic sounds. However, the functionally important MOC effect is inhibition of auditory-nerve (AN) responses. Understanding the relationship between MOC effects on SFOAEs and AN CAPs is …
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Auditory-nerve fiber responses to amplitude modulated tones and multi-tonal stimuli
… into the ear canal, producing sounds known as "otoacoustic emissions" (OAE) that can be measured with a sensitive microphone. One class of OAE, called "stimulus-frequency-otoacoustic-emissions" (SFOAEs), has been hypothesized to be produced by a process known as "coherent reflection filtering" …
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Otoacoustic emission (OAE)-based measurement of the functioning of the human cochlea and the efferent auditory system
The discovery of otoacoustic emissions (OAE) has advanced our understanding of cochlear mechanics and the efferent auditory system. OAE are sounds generated within<br/>normal cochlea either spontaneously or in response to stimulation. The ability to measure OAE non-invasively, objectively and …
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A preliminary study on the effect of selective serotonin reuptake inhibitors on peripheral and lower brainstem auditory processing.
… thresholds, uncomfortable loudness levels (UCL), otoacoustic emissions, masking level difference, temporal integration, amplitude resolution, and Beck Depression Inventory-II (BDI-II) scores. Results indicated that there was a significant difference in the amplitude resolution of the unmedicated …
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The Effects of Selective Serotonin Reuptake Inhibitors (SSRI) on Auditory Measures in Women
… measures included: audiometry, tympanometry, otoacoustic emissions, uncomfortable loudness level, masking level difference, SCAN-A, Synthetic Sentence Identification (SSI), and the low predictability section of the Revised Speech in noise (RSPIN). The unmedicated group scored significantly …
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Objective Measures of Tinnitus in Humans
… auditory system were used. Distortion product otoacoustic emission (DPOAE) input/output functions were calculated to assess cochlear function, contralateral suppression of reflectance-based stimulus frequency otoacoustic emissions was calculated to assess central auditory efferent function, and …
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