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 19 of 19 for “"distortion product otoacoustic emissions"”.
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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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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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A distortion product otoacoustic emissions (DPOAE) assessment of cochlear function in tinnitus subjects with normal hearing sensitivity
… a prerequisite for 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 …
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Distortion product otoacoustic emissions: towards reliable and valid early identification and monitoring of hearing in adults receiving ototoxic medication
… will not be affected 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 …
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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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The influence of ploidy level on the hearing sensitivity of the sister species Hyla chrysoscelis and Hyla versicolor
… was measured as vibration of eardrums, distortions by hair cells in the inner ears, and electrical activity in an auditory nucleus of the brain. All morphological features were slightly larger in H versicolor than H chrysoscelis; including SVL, body mass, interaural distance, and eardrum …
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The Audiometric Profile of Young Adults Who Report Difficulty with Speech Perception in Noise
… pure tone thresholds (9000-12,500 Hz), QuickSIN, distortion product otoacoustic emissions (DPOAEs), and auditory brainstem responses (ABR) in 13 participants (5 with reported difficulty in noise & 8 controls). Participants who reported difficulty in noise rated their speech perception in noise …
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Hear Today, Gone Tomorrow: Exploring Quinoxaline Derivatives as a Treatment for Noise-Induced Hearing Loss
… using auditory brainstem responses (ABR), distortion product otoacoustic emissions (DPOAE), and morphological analysis. The derivatives’ bioavailability was assessed using an in silico ADME assay from SwissADME. A kinome activity assay was performed on organs of Corti to assess changes in …
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Slow modulation of cochlear response by the olivocochlear efferent system elicited by sustained noise or threshold elevation in the contralateral ear
… of guinea pig hearing, and suppresses distortion product otoacoustic emissions (DPOAEs), compound action potentials (CAPs), and round window noise. In contrast to the MOC slow effect, which has been reported for sustained shockevoked MOC activity, MOC delayed suppression does not build …
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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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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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A multiple test battery approach during the assessment of the auditory nervous system of patients with multiple sclerosis
… during every day life; • Puretone audiometry, distortion product otoacoustic emissions as well as the cochlear microphonic; and • Auditory brainstem response recording using both the rarefaction and condensation click polarities consecutively. The results indicated that a high percentage of …
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Effects of Developmental Exposure to Environmental Contaminants on the Auditory System
… in northeastern Wisconsin. Measurements of distortion product otoacoustic emissions (DPOAEs) and auditory brainstem responses (ABRs) revealed significant deficits in PCB-exposed rats. We then performed experiments to determine if developmental exposure to MeHg resulted in similar hearing …
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Effects of ear-canal geometry and middle-ear pressure on wideband acoustic reflectance
… pressure (TPP), to study the effects of NMEP on distortion-product otoacoustic emissions. WAI data were also collected in that study, and are analyzed in this thesis using the reflectance factorization method (Robinson et al., 2016). For the 8 ears presented here, NMEP has the largest and most …
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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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Interactive effects of developmental PCB exposure and relevant environmental risks on the auditory system
… of the offspring was tested by measuring distortion product otoacoustic emissions (DPOAEs). DPOAE amplitudes were decreased and thresholds were elevated in the 6 mg/kg PCB group. Exposure to PBDEs alone did not cause DPOAE deficits. Importantly, there was an interactive effect from …
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Auditory characteristics and balance function of diabetic patients
… otoscopy, pure tone audiometry, diagnostic distortion product otoacoustic emissions (DPOAE), vision screening, peripheral neuropathy screening, Dynamic Gait Index test (DGI) and the Modified Clinical Test of Sensory Integration (MCTSIB). Data were analyzed using both descriptive and …