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 149 for “"cochlea"”.
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Modelling the human cochlea
One of the salient features of the human cochlea is the incredible dynamic range it possesses—the loudest bearable sound is 10,000,000 times greater than the softest detectable sound; this is in part due to an active process. More than twelve thousand hairlike cells known as outer hair cells are …
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Richtungshoeren bei Kindern mit bilateralen Cochlea-Implantaten im Vergleich zu Kindern mit unilateralem Cochlea-Implantat
Das Cochlea-Implantat oeffnet gehoerlos geborenen Kindern ein Tor in eine fuer sie neue Welt. CI ermoeglichen die Integration in eine akustisch orientierte Umwelt. Standardmaessig werden Patienten heutzutage unilateral mit CI versorgt. Mit modernen Geraeten laesst sich auch damit eine sehr gute …
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Kanaltrennung bei hochratiger sequentieller pulsatiler Elektrostimulation der Cochlea
… Verfahrens zur Abschätzung der Kanaltrennung bei Cochlea Implantaten (CI) mit Multielektrodenträger und der Faktoren, die die Kanaltrennung beeinflussen. Als Grundlage der Untersuchungen zur Kanaltrennung wurden die Refraktäreigenschaften des Hörnerven untersucht, insbesondere unter dem Aspekt …
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Data Acquisition Interface of a VLSI Cochlea Model
Computer models of cochlear processing take exceedingly long times to run, even for short data sets. A data acquisition system was developed for a new switched-capacitor VLSI cochlea model chip, in order to rapidly perform cochleaI processing on digitzed speech samples. The system is capable of …
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Modeling and design of an active silicon cochlea
Silicon cochleas are inspired by the biological cochlea and perform efficient spectrum analysis: They realize a bank of constant-Q Nth-order filters with O(N) efficiency rather than O(N²) efficiency due to their use of an exponentially tapered filter cascade. They are useful in speech-recognition …
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CANNABINOID RECEPTORS (CB) IN COCHLEA: CHARACTERIZATION AND OTOPROTECTIVE FUNCTIONS
… of reactive oxygen species (ROS) in regions of cochlea such as organ of Corti, stria vascularis (SVA), spiral ligament (SL) and spiral ganglion neurons (SG). This leads to increased synthesis of pro-inflammatory cytokines, disruption of mitochondrial membrane integrity, activation of DNA …
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A high accuracy nonlinear model of the human cochlea
… investigation, the novel system (termed the cochlear voltage difference gram) seems to predict the audibility of speech cues in noise as well as or better than the articulation index gram in most cases, although a thorough comparative analysis must still be conducted. At a 16 [kHz] sampling …
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An analytic model of the Cochlea and functional interpretations
The cochlea is part of the peripheral auditory system that has unique and intriguing features - for example it acts as a wave-based frequency analyzer and amplifies traveling waves. The human cochlea is particularly interesting due to its critical role in our ability to process speech. To better …
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Measuring sound-induced motions of the alligator lizard cochlea
… primarily by mechanical properties of the cochlea. These mechanical properties are poorly understood in any species. This thesis contributes to our understanding of cochlear mechanics by presenting measurements of sound-induced motion of the alligator lizard cochlea. Novel methods were …
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Sound-induced micromechanical motions in an isolated cochlea preparation
… in the apical region of an isolated gerbil cochlea. The cochlea is submerged in a low-chloride, low-calcium artificial perilymph solution and cemented to the bottom of a Petri dish at an angle. The bone above scala vestibuli of one half of the apical turn is removed to allow optical imaging …
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Sprachtestergebnisse und Einflussfaktoren auf die Sprachverständlichkeit nach Cochlea-Implantat-Versorgung
… Würzburg wurden seit der Implantation des ersten Cochlea-Implantats (CI) 1991 bis heute 449 Ohren implantiert (Stand 03/2003). Im Rahmen der vorliegenden Studie wurde an einem Kollektiv von 148 erwachsenen Patienten, die mit einem CI der Firma MED-EL (Innsbruck) versorgt worden waren, die …
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Center Manifold Dynamics in Randomly Coupled Oscillators and in Cochlea
<p>In dynamical systems theory, a fixed point of the activity is called nonhyperbolic if the linearization of the system around the fixed point has at least one eigenvalue with zero real part. The center manifold existence theorem guarantees the local existence of an invariant subspace of the …
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Struktur und Funktion der afferenten Synapse innerer Haarzellen der Cochlea
… konfokaler Mikroskopie an immungefärbten Cochleae von Maus und mongolischer Wüstenrennmaus eine Karte der Synapsen- und afferenten Innervationsdichte der IHZ in Abhängigkeit von ihrer tonotopen Lokalisation erstellt. Dabei zeigt sich, daß die Innervationsdichte in den tonotopen Bereichen …
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In-vivo measurement of sound-induced motions in the gerbil cochlea
… sound-induced motions in a live mammalian cochlea using a laser Doppler velocimeter (LDV). We measured the basilar membrane (BM) in the Mongolian gerbil at a distance of roughly 1.5 mm from the extreme base and found a best frequency (BF) of roughly 35 kHz. We chose the base to gain access …
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Experimental tests of an electro-anatomical model of the rat's cochlea
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Adeno-Associated Mediated Transduction of Sensory Epithelia Within the Guinea Pig Cochlea
… of sensory epithelia within the guinea pig cochlea Chairperson: Dr. David J. Poulsen, PhD. Hearing loss is the most common disability of the senses and affects 250 million people worldwide. This condition is often caused by the degeneration of the sensory cells, called hair cells, found …
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Adeno-Associated Mediated Transduction of Sensory Epithelia Within the Guinea Pig Cochlea
… of sensory epithelia within the guinea pig cochlea Chairperson: Dr. David J. Poulsen, PhD. Hearing loss is the most common disability of the senses and affects 250 million people worldwide. This condition is often caused by the degeneration of the sensory cells, called hair cells, found …
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Characterization in cochlea of KCTD12/PFET1, an intronless gene with predominant fetal expression
… important for hearing and deafness, a novel cochlear transcript with predominantly fetal expression containing a single tetramerization domain (PFET1, HUGO-approved symbol KCTD]2) was identified from the Morton fetal cochlear cDNA library. KCTD12/Kctd]2 is an evolutionarily conserved …
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Binaural interactions in the auditory midbrain with bilateral electric stimulation of the cochlea
Bilateral cochlear implantation seeks to restore the advantages of binaural hearing to the profoundly deaf by giving them access to binaural cues normally important for accurate sound localization and speech reception in noise. This thesis characterizes binaural interactions in auditory neurons …
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