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 28 for “"Hearing Thresholds"”.
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Estimating Nonorganic Hearing Thresholds Using Binaural Auditory Stimuli
… identify the presence of unilateral nonorganic hearing loss (NOHL). Minimum contralateral interference levels (MCILs), which can be used to estimate true hearing thresholds in individuals with unilateral NOHL, are also based on this principle. In this study, the Stenger Principle is used to …
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The Development and Role of Peripheral Auditory Structures in <i>Otocinclus affinis</i>
… compound pterotic may act as an external ear for hearing in this taxon, I hypothesized that these swim bladders structures have an acoustical functional in the loricariid <i>Otocinclus affinis</i>. In order to understand the development of these structures in <i>O. affinis</i>, I first monitored …
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Associations of Persistent Organic Pollutants Exposure with Coronary Heart Disease and Hearing Loss
… such as coronary heart disease (CHD) and hearing loss, potentially through inflammatory pathways. Inflammation is a key biological mechanism in the development of CHD, and several traditional CHD risk factors are also associated with hearing loss. We examined the cross-sectional …
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Effectiveness of different medical interventions implemented when a change in hearing status is detected during ototoxicity monitoring
… bilateral, highfrequency (HF) sensorineural hearing loss (SNHL). The impact of hearing loss (HL) due to aminoglycoside-induced cochleotoxicity can influence a patient's communication, psychological, physical functioning and overall well-being negatively and lead to a reduced quality of life …
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Melanin as an Oto-Protective Pigment in Two Fish Species: <i> Poecilia Latipinna </i> and <i>Cyprinus Carpio </i>
… may serve to protect the mammalian ear from hearing loss. Minimal previous research on melanin within the inner ears of fishes has been conducted. In this study, the melanin levels in the inner ears of different color morphs of two fish species (<em>Poecilia latipinna</em> and <em>Cyprinus …
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The efficacy of strategies used to minimise and prevent cisplatin ototoxicity in patients
… modifications used to prevent or minimise hearing loss during Cisplatin-based chemotherapy as part of patient management at Groote Schuur Hospital. The study also sought to compare different ototoxicity grading criteria; namely the National Cancer Institute Common Terminology Criteria for …
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Individual differences in supra-threshold auditory perception - mechanisms and objective correlates
… In the laboratory, even listeners with normal hearing thresholds exhibit vast differences in the ability to selectively attend to a target. Understanding the mechanisms causing these supra-threshold differences, the focus of this thesis, may enable research that leads to advances in treating …
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Operant Procedures in the Auditory Assessment of "Difficult-To-Test" Individuals
… of operant conditioning procedures to determine hearing threshold levels with profoundly retarded individuals. Procedure. Three profoundly retarded individuals were trained to respond on an FR 2 or 3 schedule of reinforcement to puretone presentations of several frequencies (500,1000, 2000, and …
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Auditory brainstem response latency in noise as a marker of cochlear synaptopathy
… be challenging, even for listeners with normal hearing thresholds (NHT). This difficulty in "normal" listeners is thought to arise from central sites of the auditory system with the assumption that sound encoding at the auditory nerve (AN) is robust. Despite this assumption, growing evidence …
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Gender Differences in Auditory Perception of Pure Tone Frequencies and Speech Intelligibility via Bone Conduction Transducers
… if gender differences exist in bone conduction hearing processes. The first experiment was a pure tone study where hearing thresholds for six pure tone frequencies and four bone conduction skull locations were measured in 15 male and 15 female participants to determine if gender differences …
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Vestibular Evoked Myogenic Potentials and Postural Control in Adults with Age-Related Hearing Loss
<p>It is well-documented that auditory thresholds decrease with age, which can be referred to as Age-related hearing loss (ARHL). ARHL is one of the most common conditions affecting older adults and is associated with several conditions including decreased postural stability and falls. Age-related …
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Fine structure in distortion product otoacoustic emissions and auditory perception
… 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 of the current work is to increase the basic understanding of distortion-product-otoacoustic-emission (DPOAE) generation and so …
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Hearing Sensitivity and the Effect of Sound Exposure on the Axolotl (Ambystoma Mexicanum)
… inner ear. In fact, little is known about the hearing capabilities of the axolotl or other salamander species. I recorded auditory evoked potentials (AEPs) of six axolotls at eleven frequencies (0.1, 0.25, 0.4, 0.6, 0.8, 1, 1.5, 2, 3, 4, and 6 kHz) in order to produce baseline audiograms of …
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Relationship between measures related to the cochlear active mechanism and speech reception thresholds in backgrounds with and without spectral and/or temporal fluctuations
… the expansion characteristic from absolute hearing thresholds, can accurately simulate the mean speech intelligibility results of hearing-impaired listeners, its ability to simulate the performance of individual listeners is limited. Given the relationship between loudness perception and the …
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Neural abnormalities underlying tinnitus and hyperacusis
… pathway. Subjects with clinically normal hearing thresholds, with and without tinnitus, underwent fMRI or ABR testing and behavioral assessment of sound-level tolerance (SLT). The auditory midbrain, thalamus, and primary auditory cortex (PAC) showed elevated fMRI activation related to …
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Effects of Multi-Modal Warning Systems on Elderly Drivers'Perceived Urgency and Comfort
… as expected elderly individuals had higher hearing thresholds (dBHL) than young across all the frequencies (250, 1000, 2000 and 4000 Hz) of pure tones. The difference was more pronounced at 4000 Hz. In visual acuity tests administered, elderly individuals had a lower Snellen VA than young at …
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Assessing anthropogenic noise impacts and relevant soundscape cues for marine invertebrates: leveraging squid and coral reefs as model systems
… to adverse effects of anthropogenic noise on hearing and behavior. However, little is known about marine invertebrates’ responses to anthropogenic noise, and the ambient environmental sounds (“soundscapes”) they detect and respond to. Most acoustic studies report sound pressure (detected by …
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Assessing anthropogenic noise impacts and relevant soundscape cues for marine invertebrates: leveraging squid and coral reefs as model systems
… to adverse effects of anthropogenic noise on hearing and behavior. However, little is known about marine invertebrates’ responses to anthropogenic noise, and the ambient environmental sounds (“soundscapes”) they detect and respond to. Most acoustic studies report sound pressure (detected by …
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The Effect of Masking on the Acoustic Reflex Threshold
… It has been shown that masking which shifts the hearing threshold causes a loudness function typical of recruitment. It was hypothesized that the stapedial reflex threshold remains the same in a masked situation as in the unmasked situation . It was suggested that this demonstrates recruitment in …
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Mutation of SLC7A14 Causes Syndromic Hearing Loss
Hearing loss is the most common sensory deficit worldwide. Various pathogenic variants have been linked to sensorineural hearing loss, and transcriptomic analysis has also implicated novel mutations in hair cell genes. This study investigated Slc7a14, which is upregulated in adult mouse inner hair …
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