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 137 for “"Auditory system"”.
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Neural models of modulation frequency analysis in the auditory system
… modulated (AM) acoustic stimuli in the mammalian auditory system. A biologically motivated neural model of AM processing has been developed. The first main component of the model allows for the simulation of the response properties of cochlear nucleus ideal onset units, a neuron type that is known …
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Effects of Developmental Exposure to Environmental Contaminants on the Auditory System
… of neurotoxic effects, including long-term auditory deficits. We assessed auditory function in adult rats developmentally exposed to a unique PCB mixture formulated to model the congener profile of PCBs found in fish consumed by a human population in northeastern Wisconsin. Measurements of …
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Effects of cardiac gating on fMRI of the human auditory system
… showed that sound-evoked fMRI activation in the auditory midbrain was significantly improved by a method which reduces image signal variability associated with cardiac-related brainstem motion. The method, cardiac gating, synchronizes image acquisition to a constant phase of the cardiac cycle. …
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Monaural and binaural pathways in the ascending auditory system of the pigeon
Thesis. 1976. Ph.D.--Massachusetts Institute of Technology. Dept. of Psychology.
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Early and Late Stage Mechanisms for Vocalization Processing in the Human Auditory System
The human auditory system is able to rapidly process incoming acoustic information, actively filtering, categorizing, or suppressing different elements of the incoming acoustic stream. Vocalizations produced by other humans (conspecifics) likely represent the most ethologically-relevant sounds …
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Tension Propagation Along Tip-Link Cadherins: Regulation and Implications for the Auditory System
… the full frequency and intensity range of auditory stimuli. In the present work, we model the tip link as a worm-like chain and evaluate its fast dynamic response using theoretical and numerical calculations. Our analysis uncovers frequencies at which the tip link exhibits viscoelastic …
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Effects of Exposure to Perinatal Ultrasound Radiation on Information Processing in the Auditory System
… Rats have a well characterized central nervous system whose neurochemical pathways and neuronal electrophysiology qualitatively correspond to those of humans. Because of this, we opted to use Wistar rats as an animal model to document effects from ultrasound exposure. We exposed one group of …
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Interactive effects of developmental PCB exposure and relevant environmental risks on the auditory system
… PCB exposure has been shown to cause auditory deficits that last through adulthood. We assessed the interaction of PCBs with other environmental risks to examine if there were additive or interactive effects on auditory function. Rats were exposed developmentally to a unique …
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Investing the effects of body-coupled ultrasound on the auditory system for a novel hearing aid
… therapeutic tool that has been shown to induce auditory perceptions when coupled to the mastoid of human subjects. This technology has the potential to create new hearing devices that provide benefits that traditional hearing prosthetics are not able due to the higher stimulation frequencies of …
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Digital encoding of speech and audio signals based on the perceptual requirements of the auditory system
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1979.
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A modeling framework and toolset for simulation and characterization of the cochlea within the auditory system
… the ear canal and to characterize the cochlear system in the frequency domain. Scope The study develops existing physical models covering the outer, middle, and inner ears. The range of models are passive linear, active linear, and active nonlinear. These models are formulated as differential …
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Otoacoustic emission (OAE)-based measurement of the functioning of the human cochlea and the efferent auditory system
… 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 quickly makes a powerful tool to probe cochlear mechanics. Stimulation …
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Quantifying effects of aging across structures of the mouse auditory system, with in-vitro brain slice preparations
… work, I look at the intersection of aging, the auditory system, and metabolism. The first section of this work deals with aging in the auditory system, the most salient and defining feature of which is hearing loss. Although hearing loss may be primary, hearing requires central brain structures, …
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The auditory system of the minke whale (Balaenoptera acutorostrata) : a potential fatty sound reception pathway in a mysticete cetacean
… we lack basic information about their auditory physiology for comprehensive risk assessments. Hearing ranges and sensitivities could be measured if customized equipment and methods were developed based on how baleen whales receive sound. However, sound reception pathways in baleen …
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The Post-Metamorphic Development of The Peripheral Auditory System of The Bullfrog, Rana Catesbeiana: An Anatomical and Physiological Study
… post-metamorphic development of the peripheral auditory system of the bullfrog, Rana catesbeiana. The acoustic responses of single fibers of the VIIIth cranial nerve were studied in juvenile and adult frogs. Three populations of auditory fibers are found in both groups, but there is a downward …
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The auditory system of the minke whale (Balaenoptera acutorostrata) : a potential fatty sound reception pathway in a mysticete cetacean
… we lack basic information about their auditory physiology for comprehensive risk assessments. Hearing ranges and sensitivities could be measured if customized equipment and methods were developed based on how baleen whales receive sound. However, sound reception pathways in baleen …
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Auditory system comparisons between sand cats and other felid species : acoustic input admittance of ears and auditory brainstem responses
… acoustic power absorption, and thresholds of auditory- brainstem responses. In a zoo, measurements were made in 37 ears of 23 anesthetized specimens, including sand cats and five other felid species. Sand cats have lower mean thresholds at frequencies between 0.25 and 5 kHz by 6-9 dB than …
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Invasive and Noninvasive Brain Stimulation Strategies for the Treatment of Tinnitus
The central auditory system consists of a series of relay stations at which auditory information is processed in stages before reaching the auditory cortex for sound perception. However, descending projections and non-auditory inputs into the central auditory system also play a vital role in …
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Robustness Enhancement of Sensory Transduction by Hair Bundles
<p>How do biological systems ensure robustness of function despite developmental and environmental variation? Our sense of hearing boasts exquisite sensitivity, precise frequency discrimination, and a broad dynamic range. Experiments and modeling imply, however, that the auditory system achieves …
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The hearing abilities and middle ear functioning of the recreational scuba diver
… environment may have a long term effect on the auditory system. The research literature has given a lot of attention to acute injury but is very limited relating to the long term implications of scuba diving. Previous research studies did not perform a full audiometric test battery. A …
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