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 15 of 15 for “"hearing threshold"”.
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The Effect of Masking on the Acoustic Reflex Threshold
… investigated the effect of masking noise on the threshold for stapedial reflex. 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 …
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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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Factors affecting speech recognition in noise and hearing loss in adults with a wide variety of auditory capabilities
… or noise as well as benefit and improvement with hearing aids.<br/>Another important area that has received much attention is investigating the inter-relations<br/>among various auditory and non-auditory capabilities affecting speech intelligibility. Those<br/>studies have focussed on the …
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Empirical Studies Concerning Aural Alerts for Cockpit Use Leading to an Aural Alerting Signal Categorization Scheme
… In Experiment 1, 20 subjects having "normal" hearing threshold levels provided magnitude estimation urgency ratings for a series of aural alerts. These ratings revealed that subjects perceived low, moderate, and high urgency levels within each of four equally urgent aural alerting sets. In …
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Hearing assessment aboard the International Space Station
… of the accuracy of a novel PC-based hearing assessment utilized aboard the International Space Station. During the design and construction of the ISS, time and funding constraints led to engineering compromise related to acoustics, resulting in a vehicle with excessive noise levels. …
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Development of a non-invasive electrophysiological system for measuring the auditory capability of marine animals
… aquatic animals, presented as audiograms showing hearing threshold verses sound frequency. The accuracy of such information is essential for the optimisation of bio-technical devices such as the Acoustic Fish Deterrent (AFD) barrier deployed in the Illinois River to prevent the migration of …
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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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Perceptual cues of consonant sounds and impact of sensorineural hearing loss on speech perception
… the impact of various types of cochlear hearing loss and mask- ing noise on the perception of basic speech sounds based on the information of identified speech cues. A psychoacoustic method, named three-dimensional deep search (3DDS), is developed to identify the perceptual cues of …
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Behavioural and Neuroimaging Studies of the Influence of Semantic Context on the Perception of Speech in Noise
… data were also analyzed. Cognitive and hearing threshold differences were considered as factors influencing results. Finally, individual variability in the use of context was explored. Comprehension by both groups benefited from meaningful context, without a clear difference in the …
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Acoustic and visual tracking reveals distribution, song variability and social roles of humpback whales in Hawaiian waters
… is probably an underestimate of the response threshold and certainly an underestimate of their hearing threshold. Taken together, these findings reported here suggest the need to expand the traditional interpretations of singing humpback whales as obtained from visual observations alone.
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An in vivo study of GTF2IRD1 function and its contribution to the physical features of Williams Beuren Syndrome
… of WBS, it is common to find sensorineural hearing loss (SNHL) and a characteristic set of facial features. The gene GTF2IRD1, first discovered in our laboratory, and the adjacent, homologous gene GTF2I, both fall within the WBS deletion region. Haploinsufficiency of the transcriptional …
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Pitch, loudness and frequency selectivity in low-frequency hearing loss
… cochlear hydrops show fluctuating low-frequency hearing loss (FLFHL). At present these changes are followed as patients' subjective reports and occasional measurements. Consecutive long-term measurements should provide more comprehensive information on the hearing fluctuations than the occasional …
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Methods for robust characterization of consonant perception in hearing-impaired listeners
Individuals with {\it sensorineural hearing loss} (SNHL) are prescribed hearing aids and/or a cochlear implant, based on their pure-tone threshold and speech perception scores. Although these assistive listening devices do help these individuals communicate in quiet surroundings, many still have …
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Auditory Steady-State Responses (ASSR) und transiente auditorische Hirnstammpotenziale: Evaluation und Hörschwellenvergleich an Mausmodellen der sensorineuralen Schwerhörigkeit
Auditory Steady-State Responses (ASSR) und transiente Hirnstammpotenziale: Evaluation und Hörschwellenvergleich an Mausmodellen der sensorineuralen Schwerhörigkeit. Die vorliegende Arbeit widmet sich dem Vergleich zweier objektiver Hörtests an gesunden und schwerhörigen Mäusen zur Differenzierung …
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Identifying Genes and Novel Variants Involved in Nonsyndromic Hearing Impairment, and Assessment of the Psychosocial Burden of Hearing Impairment in Cameroon
Background Hearing impairment (HI) is the most common sensory disability and occurs in about 1 per 1000 live births in high-income countries, with a much higher incidence of up to 6 per 1000 live births in sub-Saharan Africa (SSA). HI can be due to environmental or genetic causes, and in many …