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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
71

Die berufliche Situation Hörgeschädigter mit Cochlea-Implantat : eine qualitative Vergleichsstudie aus den Jahren 1999 und 2006 /

Leitzbach, Sibylle. January 2009 (has links)
Zugl.: München, Universiẗat, Diss., 2009.
72

Tone perception of Cantonese-speaking children with cochlear implant

Aisha, Rani. January 2000 (has links)
Thesis (B.Sc)--University of Hong Kong, 2000. / "A dissertation submitted in partial fulfilment of the requirements for the Bachelor of Science (Speech and Hearing Sciences), The University of Hong Kong, May 10, 2000." Also available in print.
73

Cochlear implant speech processing, based on the cochlear travelling wave

Wolmarans, Hendrik Petrus. January 2005 (has links)
Thesis (M.Eng.)(Bioengineering)--University of Pretoria, 2005. / Title from opening screen (Viewed March 20, 2006). Summaries in English and Afrikaans. Includes bibliographical references.
74

Speech-evoked auditory potentials in cochlear implant listeners /

Friesen, Lendra M. January 2007 (has links)
Thesis (Ph. D.)--University of Washington, 2007. / Vita. Includes bibliographical references (leaves 51-60).
75

Real-time implementation of recursive DFT on PDA platforms for cochlear implant studies /

Gopalakrishna, Vanishree Bijadi. January 2008 (has links)
Thesis (M.S.)--University of Texas at Dallas, 2008. / Includes vita. Includes bibliographical references (leaves 80-81)
76

Implante coclear: um estudo da escrita na escola

Bellotti, Adriana do Carmo [UNESP] 18 August 2014 (has links) (PDF)
Made available in DSpace on 2015-03-03T11:52:34Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-08-18Bitstream added on 2015-03-03T12:06:26Z : No. of bitstreams: 1 000809460.pdf: 1358507 bytes, checksum: 42b4e14fc355753ff16d096e9203518e (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / O presente estudo teve por objetivo identificar, dentre os alunos surdos, os usuários de implante coclear incluídos na rede pública e particular de ensino da cidade de Araraquara – SP, verificando como se dá a escrita dos alunos usuários de implante coclear. Para tanto foi realizado um levantamento do número de alunos implantados nas citadas redes de ensino durante o ano letivo de 2013 e identificou-se 3 alunas implantadas na rede particular, sendo duas no Ensino Fundamental I e outra no Ensino Médio, com idades variando de 6 a 17 anos. Para verificar o que pensavam seus pais e professores sobre a aquisição da escrita, foram realizadas entrevistas semiestruturadas e analisada a escrita em textos, ditados, atividades do caderno de classe e provas. Os resultados apontaram que a aquisição da escrita se dá a partir da língua oral ou gestual utilizada e que a falta de contato linguístico revela desconhecimento da língua portuguesa. A pesquisa mostrou que os alunos usuários de implante coclear necessitam de qualidade nas interações com o meio para o desenvolvimento linguístico e da escrita, e que, portanto, apenas o implante coclear e a exposição à linguagem oral não garantem a aquisição da escrita, pois a linguagem é dialógica e não depende apenas da audição, mas das interações sociais estabelecidas com seus pares / This study aimed to identify among the deaf students, users of cochlear implants included in public and private schools in the city of Araraquara - SP, checking how the writing of students with cochlear implant is. For this survey the number of deployed networks in the aforementioned teaching during the school year, 2013 students was conducted and have identified three students deployed in private schools, two in Elementary Education I and another in high school, with ages ranging from 6 to 17 years. To check what they thought their parents and teachers about the acquisition of writing, semi-structured interviews were conducted and analysed written in texts, dictations, notebook class activities and tests. The results showed that the acquisition of writing starts from the oral or sign language used and the lack of linguistic contact reveals ignorance of the English language. Research has shown that cochlear implant users need quality students in interactions with the environment to language development and writing, and that therefore only the cochlear implant and exposure to oral language does not guarantee the acquisition of writing, because language is dialogic and depends not only hearing, but also the established social interactions with peers
77

Implante coclear : um estudo da escrita na escola /

Bellotti, Adriana do Carmo. January 2014 (has links)
Orientador: Luci Pastor Manzoli / Banca: Tárcia Regina da Silveira Dias / Banca: Alessandra Del Ré / Banca: Rosimar Bortolini Poker / Banca: Maria Piedade Resende da Costa / Resumo: O presente estudo teve por objetivo identificar, dentre os alunos surdos, os usuários de implante coclear incluídos na rede pública e particular de ensino da cidade de Araraquara - SP, verificando como se dá a escrita dos alunos usuários de implante coclear. Para tanto foi realizado um levantamento do número de alunos implantados nas citadas redes de ensino durante o ano letivo de 2013 e identificou-se 3 alunas implantadas na rede particular, sendo duas no Ensino Fundamental I e outra no Ensino Médio, com idades variando de 6 a 17 anos. Para verificar o que pensavam seus pais e professores sobre a aquisição da escrita, foram realizadas entrevistas semiestruturadas e analisada a escrita em textos, ditados, atividades do caderno de classe e provas. Os resultados apontaram que a aquisição da escrita se dá a partir da língua oral ou gestual utilizada e que a falta de contato linguístico revela desconhecimento da língua portuguesa. A pesquisa mostrou que os alunos usuários de implante coclear necessitam de qualidade nas interações com o meio para o desenvolvimento linguístico e da escrita, e que, portanto, apenas o implante coclear e a exposição à linguagem oral não garantem a aquisição da escrita, pois a linguagem é dialógica e não depende apenas da audição, mas das interações sociais estabelecidas com seus pares / Abstract: This study aimed to identify among the deaf students, users of cochlear implants included in public and private schools in the city of Araraquara - SP, checking how the writing of students with cochlear implant is. For this survey the number of deployed networks in the aforementioned teaching during the school year, 2013 students was conducted and have identified three students deployed in private schools, two in Elementary Education I and another in high school, with ages ranging from 6 to 17 years. To check what they thought their parents and teachers about the acquisition of writing, semi-structured interviews were conducted and analysed written in texts, dictations, notebook class activities and tests. The results showed that the acquisition of writing starts from the oral or sign language used and the lack of linguistic contact reveals ignorance of the English language. Research has shown that cochlear implant users need quality students in interactions with the environment to language development and writing, and that therefore only the cochlear implant and exposure to oral language does not guarantee the acquisition of writing, because language is dialogic and depends not only hearing, but also the established social interactions with peers / Doutor
78

Stellenwert der präoperativen radiologischen Diagnostik vor Cochlea-Implantat-Operation / The role of preoperative radiological diagnostics before cochlear implantation

Ofenhitzer, Kathrin January 2019 (has links) (PDF)
Bei Patienten mit hochgradigem sensorineuralem Hörverlust, der nicht mehr ausreichend mittels Hörgeräten kompensiert werden kann, hat sich die CI-Versorgung zur Verbesserung der Hörfähigkeit als Standardmethode etabliert und ihr Indikationsbereich wächst. Zur Beurteilung des auditorischen Systems sowie seiner angrenzenden Nachbarstrukturen zählt die neuroradiologische Diagnostik mittels spezieller CT- und MRT-Techniken zu den entscheidenden Kriterien zur CI-Indikationsstellung und der Operationsplanung. In der Literatur finden sich verschiedenste Meinungen zur Bedeutung dieser präoperativen Bildgebungen vor Cochlea-Implantationen und die Wahl einer CT- und bzw. oder einer MRT-Untersuchung zur präoperativen Diagnostik wird diskutiert. So wurden am Universitätsklinikum Würzburg im Zeitraum von 2005 bis zum Jahr 2015 zur Diagnostik vor der CI-Operation eines Patienten meist sowohl eine CT-Aufnahme des Felsenbeins als auch eine MRT-Aufnahme des Schädels angefertigt. Im Rahmen dieser Arbeit sollte untersucht werden, inwieweit diese beiden präoperativen CT- und MRT-Untersuchungen für die CI-Operation und die Ursachenabklärung der Hörminderung von Relevanz waren und ob eine Empfehlung für die zukünftige Wahl der Diagnostikmethoden abgegeben werden kann. Dazu wurden Anamnesen, Voruntersuchungen, präoperative CT- und MRT-Bildgebungen und die Operationsberichte von 705 CI-Fällen bei 549 Patienten, die in diesem Zeitraum operiert wurden, retrospektiv ausgewertet. Die Darstellbarkeiten verschiedener Pathologien, die mit Hilfe der beiden Bildgebungsverfahren detektiert wurden, wurden miteinander verglichen und es wurde überprüft, ob ein Verfahren möglicherweise besser zur Diagnostik bestimmter Auffälligkeiten geeignet war als das andere. Durch die Auswertung der Operationsberichte wurde evaluiert, ob und wie die Befunde der präoperativen Bildgebungen mit den intraoperativen Situationen übereinstimmten und ob diese Befunde die Operationsplanung beeinflusst hatten. Die Ergebnisse dieser Arbeit zeigten, dass die bildgebenden Verfahren zur Ursachenfindung einer nicht abgeklärten Hörminderung beitragen können. Des Weiteren konnte gefolgert werden, dass ein Großteil von Auffälligkeiten im Bereich des Felsenbeins, die mit sensorineuralen Schwerhörigkeiten assoziiert sind, mit hoher Wahrscheinlichkeit sowohl mittels CT- als auch mittels MRT-Untersuchung diagnostiziert werden kann. Für einzelne Läsionen konnte vermutet werden, dass diese nur durch die CT und umgekehrt bestimmte Läsionen nur durch die MRT detektiert werden können. Außerdem zeigte sich, dass die beiden bildgebenden Verfahren auf bestimmte Schwierigkeiten, die während einer CI-Operation auftreten können, präoperativ hinweisen können. Zusätzlich konnte festgestellt werden, dass die Wahl der Implantations-Seite bei einseitig operierten aber beidseits schwerhörigen Patienten neben den CT- und MRT-Untersuchungen in den meisten Fällen von weiteren Faktoren abhing. Aus den Ergebnissen dieser Arbeit konnte gefolgert werden, dass die Durchführung einer präoperativen CT- und einer MRT-Untersuchung die umfangreichste radiologische Diagnostikmethode ist, um eine CI-Operation zu planen, möglichst alle Auffälligkeiten, die zu Schwierigkeiten in der Operation führen können, zu detektieren und Ursachen für eine nicht abgeklärte Hörminderung zu finden. Dennoch sollte, insbesondere unter Berücksichtigung der Strahlenbelastung, die ein Patient im Rahmen eines Felsenbein-CTs erfährt, die Überlegung zugelassen werden, ob zukünftig nur die Durchführung einer MRT-Untersuchung als routinemäßiges Diagnostikverfahren ausreichen könnte. Eine zusätzliche CT-Untersuchung wäre dann nur unter bestimmten Voraussetzungen (z. B. Traumaanamnese des Schädels oder Hinweise auf ein Cholesteatom) indiziert. Weitere Untersuchungen, die zeigen, welche genauen Kriterien dazu seitens des Patienten gegeben sein müssten, sowie Langzeitergebnisse nach erfolgreichen CI-Operationen sollten Gegenstand weiterer Studien sein. / Cochlear implants are the standard treatment for patients with profound sensorineural hearing loss, which cannot be treated with traditional hearing aids. In the process of preoperative diagnostics, both computed tomography (CT) and magnetic resonance imaging (MRI) are used to evaluate the auditory system. The goal of this study was to determine, which kind of results CT and MRI provided and in how many cases the results of CT or MRI influenced the procedure of cochlear implantation. In addition, this study had the aim to provide a possible recommendation, if both CT and MRI are necessary for preoperative diagnostics or if either one imaging modality may be sufficient. The results of this study showed that both CT and MRI can provide information about possible etiologies of hearing loss. Both imaging modalities proved to be able to detect the majority of abnormalities of the temporal bone and provided findings which influenced the procedure of cochlear implantation. Nevertheless, specific lesions were only detected with either CT or MRI. In particular, MRI was able to detect brain lesions, which cannot be seen in CT. Considering these results in combination with the negative aspect of exposure to radiation of CT imaging, MRI might be sufficient for preoperative diagnostics in a substantial part of cochlear implant cases.
79

Einfluss der Form elektrischer Impulse auf die intracochleäre neuronale Antwort bei Cochlea-Implantat-Trägern: triphasische Pulse mit anodischer und kathodischer zweiter Phase / Influence of the shape of electrical pulses on the intracochlear neural response in cochlear implant recipients: triphasic pulses with anodic and cathodic second phase

Kretzer, Katharina January 2022 (has links) (PDF)
Vorliegende Arbeit beschäftigte sich mit der Verbesserung von Defiziten der elektrischen Stimulation durch Cochlea Implantate (CI) mit alternativen Pulsformen. Dabei wurde mit elektrophysiologischen und psychophysikalischen Methoden untersucht, wie sich die Pulsformen auf die Effektivität der Stimulation auswirken. Es wurden präzisions-triphasische Pulse (pTP) mit anodischer und kathodischer zweiter Phase anhand der Daten von elf Probanden untersucht. Im Rahmen der objektiven elektrophysiologischen Messung wurde mit den unterschiedlichen Formen des pTP an drei unterschiedlichen Kontaktpositionen auf den CI-Elektrodenträgern stimuliert, und die Stärke der jeweils evozierten neuronalen Antwort aufgezeichnet. Der subjektive psychophysikalische Test diente dazu, die pulsformspezifischen Hörschwellen zu bestimmen und wurde an zwei unterschiedlichen Kontakten auf den CI-Elektrodenträgern durchgeführt. Dabei erzielten pTP, welche eine symmetrisch-triphasische Pulsform aufwiesen, geringere neuronale Antwortstärken und höhere Hörschwellen als die pTP, die einer biphasischen Pulsform glichen. Diejenigen pTP, die biphasischen Pulsen mit anodischer erster Phase glichen, erzielten dabei die höchsten neuronalen Antwortstärken und die niedrigsten Hörschwellen. / Present work dealt with the improvement of deficits of electrical stimulation by cochlear implants (CI) by means of alternative pulse shapes. This involved the use of electrophysiological und psychophysical methods to investigate the effect of pulse shape on the effectiveness of stimulation. Precision-triphasic pulses (pTP) with anodic and cathodic second phase were examined using data from eleven subjects. In the objective electrophysiological measurement, the different shapes of the pTP were stimulated from three different contact positions on the CI electrode arrays and the strength of the neural response evoked in each case was recorded. In the subjective psychophysical test, pTP stimulation was performed from two different contact positions on the CI electrode arrays and the pulse shape-specific detection thresholds were compared. The results showed that pTP, which exhibited a symmetric-triphasic pulse shape, achieved lower neuronal response strengths and higher detection thresholds than pTP that resembled a biphasic pulse shape. Those pTP, that resembled biphasic pulses with an anodic first phase, achieved the highest neuronal response strengths and the lowest detection thresholds.
80

Age-Related Effects on Impedances of Cochlear Implant Internal Electodes

Boshears, Allison Cheyenne, Slingerland, Sara 25 April 2023 (has links)
Cochlear implants are devices, which are implanted into the cochlea to aid hearing via stimulation of the cochlear nerve. For this study, we were interested in understanding the age-related changes in the impedances of the electrodes implanted with a cochlear implant system. The impedances of the electrodes reflect the integrity of the implanted system in the inner ear, and the efficiency of transmission of information from the externally worn device to the implanted system. Thus, monitoring cochlear impedances is important for the patient's rehabilitation. Our hypothesis was that cochlear implant impedances would decrease as an effect of age. Current systems record the impedances via a telemetry system when the patient’s cochlear implant is connected to the programming software. This data is saved within the system and can be retrieved and de-identified within the software. In our investigation, we collected the de-identified impedance data from this system to understand the effects of age. This data was collected from the ETSU Audiology Clinic at the Nave Center. The de-identified data was reviewed and sorted between 3 different age brackets. Data was averaged and compared between age brackets and electrodes. Overall, we found in this study that there are no significant differences between age brackets when comparing cochlear implant impedances across the different electrodes. The slight differences between impedances across electrodes and age brackets could be due to many contributing factors, however, the differences were not considered statistically significant. This study could indicate future directions for further research including, comparing impedance differences between male and female subjects, longitudinal case studies, and comparing across implant manufacturers and device type.

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