Дисертації з теми "Burst potential"
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Akin, Faith W., Owen D. Murnane, and Tina M. Proffitt. "The Effects of Click and Tone-Burst Stimulus Parameters on the Vestibular Evoked Myogenic Potential (vemp)." Digital Commons @ East Tennessee State University, 2003. https://dc.etsu.edu/etsu-works/1790.
Повний текст джерелаFrizzo, Ana Claudia Figueiredo. "Potenciais evocados auditivos de média latência. Estudo para diferentes níveis de intensidade sonora com estímulo tone-burst em crianças de 10 a 13 anos de idade." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/17/17140/tde-28092006-105527/.
Повний текст джерелаIntroduction: The record and study of corticals responses evoked by auditory stimulus has allowed the objective investigation from process of auditory information and a better understanding of central auditory path. The utility of the procedure has been valued by audiologists, nevertheless her clinical aplication current demand the a execution a sum more significative of the study, especially in nationals researchs, to knowledge profoundest this procedure, over all as for normative studys, waves?s identification criterion and interference of the variables with age, gender and parameters used in records. The PEAMLs are composed of a waves?s sequence with latency are around 10 a 80ms, with multiple neurogenic origen (thalamus corticais projections and auditory cortex, coliculus inferior and reticular formation in small scale). The present study objetive examined the components dos PEAMLs, in healthy childrens, researching the waves?s latency and amplitude, to know the PEAML in this band of age. Methods: make part of study 32 childrens in both genders between the ages of 10 e 13, normal hearing without neurological desorders. The statistical analises involved the descrition statistical (mean and standard deviation) and variance analises by test F. The PEAMLs are investigated with tone-burst stimuli in 50, 60 e 70 dBNA. Results and conclusions: the means values of the components are Na=20,79ms, Pa=35,34ms, Nb=43,27ms e Pb=53,36ms. To the amplitude Na-Pa the means values obtained in the study varies between 0,2 and 1,9mV (M=1,0mV). The waveforms are more consistents e more easyly identifiable. We are able to conclude that the amplitude increase and latency decrease with growth of intensity of sound. In 50dBNA the latency are significative higher that 60 and 70 dBNA to wave Na. From 60dBNA the values are stabilize and there is no significatives changes in the latency ou morphology of wave. In the comparisions inter e inta-hemisferical were observed latencys lengthest and amplitudes higher to side left (A1/Cz). In a posterior analises in conformity to complaint of hardness scholar were observeds diferrences no significants to the components Na, Pa, Nb e Pb in the childrens groups with and without complaint of hardness scholar. Anormalities in the morphology of waves were viewed in this childrens wich weren´t atribute to complaint of hardness scholar exclusively once there was interference of the patient?s age and the neural development of Central Auditory System Nervous. The present study made possible a better knowledge of PEAMLs and will contribute to securest aplication this procedure. But, another studys still are requisite, essentialy in the researchs national to established normatives standard to utily in the clinical practice.
Elijah, Daniel. "Neural encoding by bursts of spikes." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/neural-encoding-by-bursts-of-spikes(56f4cf97-3887-4e89-bc0d-8db183ce9ce1).html.
Повний текст джерелаDalvald, Momo. "Korrelerar startlereaktion med reaktionstid?" Thesis, University of Gävle, Department of Education and Psychology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-321.
Повний текст джерелаBilder av potentiella hot upptäcks snabbt och leder till en snabbare reaktionstid än bilder av icke-potentiella hot. Potentiella hot stjäl också fokus och kognitiva resurser, med en långsammare reaktionstid som följd. Rädsla, som kan mätas genom startlereflexen, leder till antingen ökad handlingsberedskap (snabbare reaktionstid) eller kognitiv distraktion (långsammare reaktionstid). Fem försöksdeltagare fick reagera på en visuell probe som lades ovanpå djurbilder, både potentiella hot och icke-potentiella hot i ett kombinerat reaktionstids- och startleprobeexperiment, där ljudstötar utdelades i hörlurar. Startlereaktion, hjärtfrekvens och reaktionstid mättes, varefter korrelationskoefficienter räknades ut. Resultatet visade på en svag negativ korrelation mellan reaktionstid och startlepotentiering på gruppnivå, men inga signifikanta samband påvisades på individnivå. Resultatet på gruppnivå kan bero på att de individuella resultaten tenderar samlas i kluster och därför skapar ett skensamband. Även en positiv korrelation mellan hjärtfrekvensförändring och startlereaktion påvisades, men ingen korrelation mellan hjärtfrekvens och reaktionstid.
Pictures of fear relevant animals are detected fast and lead to shorter reaction time, compared to pictures of fear irrelevant animals. Fear relevant animals also capture attention and steals focus, which leads to slower reaction time. Fear leads to either preparedness for action (faster reaction time) or cognitive distraction (slower reaction time). In a combined startle probe and reaction time experiment, five participants were requested to react to a visual probe, superimposed on pictures of animals, both relevant and irrelevant to fear. Startle probes were given as noise bursts in headphones. Startle reaction, heart rate and reaction time were measured. A negative correlation between reaction time and startle potentiation was found on group level, whereas no significant correlations were found on the individual level. However, the individual results tend to gather in clusters, which might give a significant result on group level even if there is none.
Porto, Maria Angelica de Almeida [UNIFESP]. "Potencial evocado auditivo de tronco encefálico – tone burst e resposta auditiva de estado estável em lactentes." Universidade Federal de São Paulo (UNIFESP), 2009. http://repositorio.unifesp.br/handle/11600/9951.
Повний текст джерелаCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Introdução: A necessidade da realização de diagnóstico audiológico nas primeiras semanas ou meses de vida aumentou com a consolidação dos programas de triagem auditiva neonatal. As emissões otoacústicas (EOA) e o potencial evocado auditivo de tronco encefálico (PEATE) com estímulo clique são amplamente utilizados. Para que a intervenção precoce tenha sucesso, informações precisas quanto ao tipo, grau e configuração da perda auditiva tornam-se necessárias. A realização do PEATE com o estímulo tone burst (TB) e da pesquisa da resposta auditiva de estado estável (RAEE) vêm se mostrando de grande valia, já que tais testes fornecem informações específicas por freqüência, permitindo uma avaliação audiológica mais detalhada. Objetivo: Analisar a aplicabilidade clínica do PEATE TB e da RAEE em 2 kHz, em lactentes nascidos a termo e pré-termo. Método: A casuística foi composta por 17 lactentes pré-termo e 19 lactentes a termo, de ambos os gêneros. O estudo foi realizado na UNIFESP e os lactentes, em sono natural, foram submetidos ao PEATE TB e à RAEE na freqüência de 2000 Hz, utilizando-se o equipamento Smart EP da Intelligent Hearing Systems. Resultados: A comparação entre as respostas da orelha direita e esquerda não apresentou diferenças estatisticamente significantes, permitindo considerar a amostra como um todo. A comparação das respostas dos lactentes pré-termo e a termo não apresentou diferenças estatisticamente significantes, com exceção do tempo de duração da RAEE. As latências médias da onda V no PEATE TB foram de 7,9 ms a 80 dBnNA, 8,9 ms a 60 dBnNA, 9,9 ms a 40 dBnNA e 10,8 ms a 30 dBnNA. A resposta eletrofisiológica mínima obtida com o PEATE TB foi de 32,4 dBnNA (52,4 dBNPS), em média. A RAEE mínima obtida foi de 13,8 dBNA (26,4 dBNPS), em média. A duração média do PEATE TB foi de 21,1 min e da RAEE de 22 min. Conclusões: O PEATE TB e a RAEE têm aplicabilidade clínica na freqüência de 2 kHz em lactentes, não havendo diferenças entre indivíduos a termo e pré-termo.
Introduction: Audiological diagnosis in the first weeks or months of life has increased with the consolidation of newborn hearing screening programs. Otoacoustic emissions (OAE) and auditory brainstem response (ABR) with click stimuli are widely used for this purpose. For a successful early intervention, accurate information about type, degree, and configuration of hearing loss are necessary. ABR with tone burst stimuli (TB ABR) and auditory steady-state response (ASSR) exams have been of great value, since these tests provide specific frequency information, resulting in a more detailed hearing evaluation. Objective: Analyze the clinical applicability of TB ABR and ASSR at 2 kHz, in full-term and premature infants. Method: The study was conducted at UNIFESP. Subjects were consisted of 17 premature infants and 19 full-term infants, male and female. In natural sleep, they have undergone TB ABR and ASSR exams (Smart EP - Intelligent Hearing Systems), at 2000 Hz. Results: Right and left ears responses showed no statistically significant differences, therefore they were considered as a whole. Wave V mean latencies in TB ABR were 7.9 ms to 80 dBnHL, 8.9 ms to 60 dBnHL, 9.9 ms to 40 dBnHL and 10.8 ms to 30 dBnHL. Electrophysiological minimum response obtained with TB ABR was 32.4 dBnHL (52.4 dBSPL), on average. ASSR minimum response was 13.8 dBHL (26.4 dBSPL), on average. TB ABR and ASSR exams lasted 21.1 min and 22 min, respectively. Premature and full-term infants responses showed no statistically significant differences, except for ASSR duration. Conclusions: Both TB ABR and ASSR have clinical applicability at 2 kHz in infants, with no differences between premature and full-term individuals.
TEDE
BV UNIFESP: Teses e dissertações
Madhavan, Radhika. "Role of spontaneous bursts in functional plasticity and spatiotemporal dynamics of dissociated cortical cultures." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/24756.
Повний текст джерелаCommittee Chair: Potter, Steve; Committee Member: Butera, Robert; Committee Member: DeWeerth, Stephen; Committee Member: Schumacher, Eric; Committee Member: Wenner, Pete.
Sonkajärvi, E. (Eila). "The brain's electrical activity in deep anaesthesia:with special reference to EEG burst-suppression." Doctoral thesis, Oulun yliopisto, 2015. http://urn.fi/urn:isbn:9789526209722.
Повний текст джерелаTiivistelmä Useat anestesia-aineet pystyvät aiheuttamaan aivosähkökäyrän (EEG) purskevaimentuman syvän anestesian aikana. Purskevaimentuma koostuu EEG:n suuriamplitudisten purskeiden sekä vaimentuneen taustatoiminnan vaihtelusta. Kaikkien anestesian syvyyttä mittaavien valvontalaitteiden toiminta perustuu osaltaan EEG:n purskevaimentuman tunnistamiseen. Tämän ilmiön parempi tunteminen on tärkeää anestesiamekanismien ymmärtämiseksi. Tutkimuksen päämääränä oli saada kattavampi käsitys hermoratojen toiminnasta syvässä anestesiassa. Väitöskirjatyö koostuu neljästä prospektiivisesta yhteensä 64 potilaan EEG-rekisteröinnit sisältävästä tutkimuksesta sekä yhdestä kokeellisen epilepsiatutkimuksen koe-eläintyöstä, jossa porsailla käytettiin isofluraanianestesiassa sekä EEG-rekisteröintejä sekä että magneettikuvantamista (fMRI) samanaikaisesti (II). Ensimmäisessä osatyössä tutkittiin keskihermon stimulaation aiheuttamia somatosensorisia herätepotentiaaleja aivokuorella EEG:n purskevaimentumatasolla sevofluraanianestesian aikana. Kolmannessa osatyössä selvitettiin propofolianestesian aiheuttamaa EEG:n purskevaimentumaa kolmelta Parkinsonin tautia sairastavalta potilaalta käyttäen sekä pintaelektrodien että subtalamisen aivotumakkeen syväelektrodien rekisteröintejä. Neljännessä osatyössä tutkittiin EEG:n topografiaa 20:llä terveeellä lapsella indusoimalla anestesia sevofluraanilla. Kaksikymmentä miespotilasta nukutettiin sevofluraanilla ja heidät satunnaistettiin joko kontrolloidun hyperventilaation tai spontaanin hengityksen ryhmiin osatyössä V. EEG-muutoksia sekä niiden yhteyttä verenkiertovasteisiin selviteltiin molemmissa osatöissä IV ja V. Omasta kehosta tuleviin tuntoärsykkeisiin liittyvä somatosensorinen informaatio saavutti aivokuoren myös syvässä EEG:n purskevaimentumatasoisessa anestesiassa. Impulssien jatkokäsittely aivokuorella oli kuitenkin estynyt. EEG:n hidasaaltotoiminta oli synkronista koko aivokuoren alueella, sen sijaan unisukkulat ja terävät aallot paikantuivat sensorimotoriselle aivokuorelle. Paikallisen epileptisen toiminnan kehittyminen oli mahdollista havaita jo ennen piikikkäiden EEG:n aaltomuotojen ilmaantumista edeltävänä BOLD-ilmiöön liittyvänä aivoverenkierron lisääntymisenä. Sevofluraanin epileptogeenisyys varmistui erityisesti hyperventilaation, mutta myös spontaanin hengityksen yhteydessä ja näihin liittyi sykkeen nousu sekä terveillä lapsilla että miehillä. Piikkejä ja monipiikkejä käsittävien aaltomuotojen keskittymistä esiintyi otsalohkon keskialueilla
Käse, Mirjam [Verfasser], and Andreas J. [Akademischer Betreuer] Fallgatter. "Transkranielle Theta-Burst-Behandlung depressiver Patienten : Untersuchung der Wirkung auf evozierte Potentiale in einem Oddball Paradigma / Mirjam Käse. Betreuer: Andreas J. Fallgatter." Würzburg : Universitätsbibliothek der Universität Würzburg, 2012. http://d-nb.info/1019944838/34.
Повний текст джерелаSilva, Bárbara Cristiane Sordi. "O uso do mascaramento no potencial evocado auditivo de tronco encefálico com estímulo tone burst por condução aérea em indivíduos com perda auditiva unilateral." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/25/25143/tde-12062018-190631/.
Повний текст джерелаThe use of contralateral masking on the investigation of auditory brainstem response is a topic widely discussed, however there is no consensus in literature about its necessity. The aim of this study was to verify the need of using masking in auditory brainstem response with tone burst stimulus presented with 3A insert earphones and to propose the applicability of white noise masking in severe or profound unilateral sensorineural hearing loss. Fifteen individuals of both genders with previous audiological diagnosis of severe or profound unilateral sensorineural hearing loss, aged between 2 to 40 years, were evaluated. For this, the neural response, which is defined by the presence of the V wave in the ear with hearing loss, was investigated in frequencies of 500, 1000, 2000 and 4000 Hz. In cases where there was a record, the search was repeated using white noise masking in the contralateral ear. The records were analyzed by two judges experienced in electrophysiology, in order to verify the concordance between the analyses. The Kappa coefficient (1.00) had almost perfect agreement strength and the Intraclass Correlation (1.00) was excellent between the two evaluators in all analyses. As a result, cross-audition was observed at least once in all analyzed frequencies. The minimum contralateral masking levels required to eliminate the untested ear involvement varied from 10 to 20 dBnNA above the electrophysiological threshold of the ear without hearing loss. It was not possible to perform the analysis for the frequency of 500 Hz due to the presence of electrical artifact and noise. It is concluded that the use of contralateral masking in the auditory brainstem response with tone burst stimulus presented with 3A insert earphone is necessary in frequencies of 1000, 2000 and 4000 Hz in individuals with severe or profound unilateral sensorineural hearing loss in intensities of 15, 20 and 10 dB above the electrophysiological thresholds, respectively.
Ortiz, Cantin. "Study of neural correlates of attention in mice with spectro-spatio-temporal approaches." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-220948.
Повний текст джерелаÄven fast flera olika hjärnområdens aktivitet kan korreleras med uppmärksamhet, anses kontrollen av uppmärksamhet regleras av högre kognitiva hjärnområden, såsom främre hjärnbarken. I en nyligen publicerad artikel studerade Kim et al. hjärnaktiviteten hos möss och kunde visa att en framgångsrik uppmärksamhet kännetecknas av en ökad aktivitet av en specifik typ av inhiberande nervceller, parvalbumin celler, och högre oscillerande aktivitet i gammafrekvens i främre hjärnbarkens lokala nätverk. Det har nyligen visats att kodning av arbetsminne i främre hjärnbarken är kopplat till utbrott av gamma-oscillationer, en diskontinuerlig nätverksprocess som kännetecknas av korta perioder av intensiva oscillationer av det lokala nätverket i gammafrekvens . Relationen mellan uppmärksamhet och arbetsminne är oklar, och det är möjligt att dessa två kognitiva processer delar kodningsprinciper. För att minska detta gap av kunskap har den elektrofysiologiska datan som samlats in i Carlén Lab analyserats med avancerade spatio-temporala tillvägagångssätt. I synnerhet har vi analyserat utbrott i gammaaktivitet i främre hjärnbarken under uppmärksamhet och undersökt likheterna med gamma- utbrott observerade under arbetsminne. Gamma-bandutbrott under uppmärksamhet påvisades på ett tillförlitligt sätt med flera metoder. Vi har karaktäriserat flera funktioner hos utbrotten, inklusive förekomsten, varaktigheten och amplituden. De enskilda cellernas aktivitet undersöktes även under och utanför utprotten av gamma-oscillationer. Vi undersökte sambandet mellan de olika kriterier som karakteriserar gamma-utbrott under framgångsrik mot misslyckad allokering av uppmärksamhet. Kontrolldata genererades för att diskutera de erhållna resultaten. Syftet med studien var att utforska hypotesen att den främre hjärnbarken kodar uppmärksamhet genom gamma-utbrott, vilket kan avslöja vissa likheter och skillnader i kodning av centrala kognitiva processer. Ingen klar skillnad hittades i karaktäriseringen mellan framgångsrik och misslyckad allokering av uppmärksamhet. Dessutom var resultaten mycket likartade i kontrolluppsättningen och den ursprungliga datan. Ingen underliggande mekanism kunde identifieras ur denna analys. Eftersom de utbrott som uppstod i gamma-bandet i främre hjärnbarken inte var unika med hänsyn till de olika testade förhållandena, tycks de därför inte koda information relaterad till uppmärksamhet.
Martineau, Killian. "Quelques aspects de cosmologie et de physique des trous noirs en gravitation quantique à boucles Detailed investigation of the duration of inflation in loop quantum cosmology for a Bianchi I universe with different inflaton potentials and initial conditions Some clarifications on the duration of inflation in loop quantum cosmology A first step towards the inflationary trans-Planckian problem treatment in loop quantum cosmology Scalar spectra of primordial perturbations in loop quantum cosmology Phenomenology of quantum reduced loop gravity in the isotropic cosmological sector Primordial Power Spectra from an Emergent Universe: Basic Results and Clarifications Fast radio bursts and the stochastic lifetime of black holes in quantum gravity Quantum fields in the background spacetime of a polymeric loop black hole Quasinormal modes of black holes in a toy-model for cumulative quantum gravity Seeing through the cosmological bounce: Footprints of the contracting phase and luminosity distance in bouncing models Dark matter as Planck relics without too exotic hypotheses A Status Report on the Phenomenology of Black Holes in Loop Quantum Gravity: Evaporation, Tunneling to White Holes, Dark Matter and Gravitational Waves." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAY044.
Повний текст джерелаAfter decades of being confined to mathematical physics, quantum gravity now enters the field of experimental science. Following this trend, we consider throughout this thesis three implementation frameworks of Loop Quantum Gravity (LQG): the Universe as a system, black holes and astroparticles. The last one is only outlined while the first two are presented in more detail.Since the cosmological sector is one of the most promising areas for testing and constraining quantum gravity theories, it was not long before the development of different models attempting to apply the ideas of the LQG to the primordial Universe. The work we present deals with the phenomenology associated with these models; both in the homogeneous sector (where we focus particularly on the duration of the inflation phase), as in the inhomogeneous sector (where this time, we study the fate of the primordial power spectra). These combined studies then allow us to specify to what extent effects of (loop) quantum gravity can be observed in the anisotropies of the cosmic microwave background.On the other hand black holes, not content to be among the strangest and most fascinating objects of the Universe, are also prominent probes to test the theories of gravitation. We develop the phenomenology associated with different treatments of black holes in the loop quantum gravity framework, which intervenes on multiple levels: from the evaporation of Hawking to gravitational waves, including dark matter. This is undoubtedly a rich and vast area.Finally, the existence of a minimal length scale, predicted by the majority of quantum gravity theories, suggests a generalization of the Heisenberg uncertainty principle. On the basis of this observation, we also present in this manuscript a methodology to derive a new relation dispersion of light from the most widely used generalized uncertainty principle
Chi-Fron, Lu, and 盧基鋒. "The Preliminary Study of Rock-burst Potential Using DDA." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/99508278592850778082.
Повний текст джерела中原大學
土木工程研究所
86
Rock-burst is a drastic failure phenomenon that always occurs in underground excavations, especially for those with great depth. Because the rock fragments fly from the excavation walls due to the rapid release of energy, rock-burst endangers the construction facility and personnel on the site. In Taiwan, more proposed tunnels will pass through the high mountain regions (like Central Mtn.), and it is inevitable to encounter the severe rock-burst problems. In the field, the intact rock mass before failure may be regarded as continuous, however, when it starts to crack and produces flying rock fragments due to excavation unloading, a discontinuous behavior prevails. The Discontinuous Deformation Analysis (DDA) developed by Dr. Shi will be used to study such a problem in this thesis. The initial program of DDA combined with the Artificial Joint Concept (AJC) which first cuts a continuous domain into sub-blocks by artificial joints and then re-glue them together by assigning T0, coh., fric., is adopted to simulate the progressive fracturing of a rock mass under external loading. In the numerical study of uni-axial compression test by strain-controlled loading on one specimen composed of intact rock and another with one inclined discontinuity, the DDA results are well compatible with the theoretical solution. Additionally, in the study for the specimens cut by a certain pattern of artificial joints, it is found that the strain loading rate, the strength (friction angle and cohesion) and inclination of artificial joints affects the stress-strain relationship computed by DDA, to some extent. In the study of machine stiffness effect, DDA yields the results comparable to that defined by the traditional theory, i.e., when machine stiffness is greater than the post-peak stiffness of rock specimen, a complete stress-strain curve can be obtained; otherwise the rock specimen suddenly breaks near the peak strength. It is a great challenge in engineering practice to precisely predict the rock-burst behavior in tunnels. The DDA combined with AJC is still used in the thesis to provide a means to conduct such a task, in which a normalized kinetic energy index (E*) is defined to quantify the fracturing rate of a rock mass, and further to represent a potential index of rock- burst. The simulation results indicate that the time-history curves of E* and the survival number of cemented contacts could be adopted to point-out the initiation time of rock-burst and energy release level. Moreover, in the such a system reveals its lower potential of rock-burst. The method- ology to predict the rock-burst potential proposed in the thesis is actually on its premature stage, and it is suggested in the near future to perform more parametric study, to modify computation algorithms and include field data for enhancing its capability.
Verma, Rupesh Kumar. "A Combined Theoretical-Experimental-Numerical Approach to Characterization and Modelling of Rock Fracture and Rock Burst." Thesis, 2020. http://hdl.handle.net/2440/126543.
Повний текст джерелаThesis (Ph.D.) -- University of Adelaide, School of Civil, Environmental and Mining Engineering, 2020
Jochum, Sybille [Verfasser]. "Akustisch evozierte Potentiale mittlerer Latenz unter Burst-Suppression-EEG / Sybille Jochum." 2006. http://d-nb.info/985396334/34.
Повний текст джерелаVabulaitė, Eglė [Verfasser]. "Vestibulär evozierte myogene Potentiale (VEMP) im Vergleich von Klick-Reizen und Burst-reizen / Eglė Vabulaitė." 2007. http://d-nb.info/988133725/34.
Повний текст джерелаWu, Huei-Jun, and 吳蕙君. "Comparison of Short Tone Burst Evoked and Click Evoked Vestibular Myogenic Potentials in Healthy Individuals." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/70286039989363480538.
Повний текст джерела國立台北護理學院
聽語障礙科學研究所
96
Background: Vestibular evoked myogenic potential (VEMP) is becoming one of the clinical tools to evaluate auditory and vestibular function. VEMP can be recorded from sternocleidomastoid muscle by auditory stimulation with various stimuli. The aim of this study is to compare VEMP responses evoked by short tone burst (STB) with those evoked by click stimuli in healthy individuals, to treat about those of influential factors, to compare with other studies. Those would be allowing for further consideration in clinical applications. Methods: Twenty-two healthy volunteers (11 males, 11 females), age ranged from 17 to 30 years were enrolled in first step study, eight subjects (4 males, 4 females) among volunteers participated in second step. Subjects lay down in supine position, were instructed to elevate heads unsupported. VEMPs were recorded from 500 Hz STB and click by monaural stimuli-unilateral recording and sequential method. In first step, STB prior to click, further in second step, click prior to STB. The latency p13, latency n23, p13-n23 amplitude and VEMP asymmetry ratio (VAR) were obtained for further analysis. Results: The STB VEMPs and click VEMPs presented in all subjects and revealed no significant difference between left and right side. The latencies p13, n23 of STB VEMP were longer and the amplitudes were greater than click VEMP in first and second step testing (p < 0.05, paired samples t test), as well. The VAR showed no difference between two stimuli. The latencies p13, n23 and VAR of click VEMP revealed no significant difference between first and second step testing. Latency n23 of STB VEMP in second step was longer than first step testing (p < 0.05, paired samples t test). The latencies p13, n23 and VAR of STB VEMP revealed no significant difference from other studies. However, the latency n23 of click VEMP revealed significant difference from one of other studies (p < 0.05, meta-analysis). The STB VEMP and click VEMP showed no difference between genders. Furthermore, STB VEMP and click VEMP revealed no difference between tempanogram Type As and Type A. Conclusion: The latency p13 and VAR were stable in STB VEMP and click VEMP. VEMP responses were significant difference between STB and click. The latencies p13, n23 and VAR of STB VEMP revealed no significant difference between others and our studies. STB VEMP and click VEMP revealed no difference between tempanogram Type As and Type A. For clinical application, 500 Hz STB was superior to click, because the latency n23 of click VEMP was significant difference among several labs. Norms of different stimuli should be established for clinical interpretation.
Wang, Shou-Jen, and 王守仁. "Short tone-burst and mechanical vibration in eliciting ocular and cervical vestibular-evoked myogenic potentials." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/06362355784655148070.
Повний текст джерела國立臺灣大學
醫學工程學研究所
100
Similar to the cervical vestibular evoked myogenic potential (cVEMP) test, which has been widely applied in clinical practice during the past decade, the recently developed ocular VEMP (oVEMP) test has been studied extensively and used to explore vestibular disorders. Both cVEMP and oVEMP tests have been used to investigate otolithic organs and their central vestibular pathways, including the ipsilateral descending sacculo-collic reflex and a crossed ascending vestibulo-ocular reflex. First of all, this study compared the oVEMPs that are elicited in response to monaural and separately, simultaneous binaural air-conducted sound (ACS) stimulations. Twenty healthy volunteers without any previous ear disorders were enrolled in this study. Each subject underwent oVEMP testing using monaural ACS stimulation (Mon-oVEMP) with different stimulus intensities. On another day, the same volunteers underwent oVEMP testing using simultaneous binaural ACS stimulation (Bin-oVEMP). With 95 dB nHL 500Hz short tone-burst ACS stimulation, the biphasic nI–pI waveforms were recorded with maximal amplitudes from the electrodes located below the eyes contralateral to the side of acoustic stimulation while the subject was gazing upward. Significant correlations were identified between Mon-oVEMPs and Bin-oVEMPs with respect to threshold, latencies and amplitude. However, no significant difference existed between Mon-oVEMPs and Bin-oVEMPs in terms of the response rate, threshold, latency or amplitude. The Bin-oVEMP test yields the same information as the Mon-oVEMP test, but the duration of recording in the former is shorter than the latter. The Bin-oVEMP test may be a more convenient screening tool for evaluating the crossed vestibulo-ocular reflex. Subsequently, the aim of this study was to determine whether bone-conducted vibration (BCV) or ACS is the optimal mode for eliciting both oVEMPs and cVEMPs. Twelve healthy volunteers, five patients with unilateral chronic otitis media, and 10 patients with unilateral Meniere disease underwent oVEMP and cVEMP tests using ACS and BCV stimulation modes in a random order. In healthy controls, BCV mode at Fz had a significantly higher response rate and larger nI-pI amplitude of oVEMPs than that of the ACS mode. In cVEMPs, a significantly higher response rate was noted in BCV mode at inion, when compared with ACS mode. However, no significant difference was noted in the p13-n23 amplitude between these two modes. In five chronic otitis media ears, absence of oVEMPs and cVEMPs in ACS mode and presence of oVEMPs and cVEMPs in BCV mode were shown. In 10 patients with Meniere disease, BCV mode elicited higher response rates of oVEMPs and cVEMPs in the pathological ears than ACS mode did. Using BCV mode, Fz and inion may be the optimal sites for eliciting oVEMPs and cVEMPs, respectively. Thus, BCV mode can be substituted for ACS mode to elicit oVEMPs and cVEMPs in the future, especially in “mass detection.” In contrast, ACS mode provides an essential clinical merit of site selectivity. Additionally, this study compared cVEMPs and oVEMPs between ACS and BCV modes to determine whether these two stimulation modes activate the same population of primary vestibular afferents. Fifteen healthy subjects underwent cVEMP and oVEMP tests using ACS stimuli at 105dB nHL and BCV stimuli at 128 dB force level (FL). The characteristic parameters of cVEMPs and oVEMPs were compared between ACS and BCV modes. The mean p13 and n23 latencies of ACS-cVEMPs were significantly longer than those of BCV-cVEMPs. Likewise, the mean nI and pI latencies for ACS-oVEMPs were also significantly longer than those for BCV-oVEMPs. There was no significant difference in the mean amplitude of cVEMPs between the ACS and BCV modes. However, comparing the oVEMP amplitude, a relationship: (Amplitude of BCV-oVEMP) = 2.3 x (Amplitude of ACS-oVEMP) was demonstrated. In short, the population of primary vestibular afferents activated by ACS and BCV stimuli is similar for cVEMPs. In contrast with oVEMPs, BCV mode activates more number of primary vestibular afferents than ACS mode does. Finally, this study combined BCV stimulation with triaxial accelerometry to correlate the acceleration magnitudes of BCV stimuli with oVEMP test results. Fourteen healthy volunteers underwent oVEMP test using BCV stimuli with simultaneous monitoring the triaxial acceleration. All subjects exhibited clear oVEMPs in response to BCV stimuli from a vibrator. The lowest acceleration magnitudes for eliciting oVEMPs along the x-, y- and z-axes were 0.05 ± 0.01 g, 0.16 ± 0.08 g, and 0.04 ± 0.01 g, respectively, exhibiting significantly higher acceleration magnitude along the y-axis than those along the x- and z-axes. In addition, significantly positive correlations were noted between the acceleration magnitude along each axis and the oVEMP amplitude. Therefore, increasing acceleration magnitude may have more synchronization of firing of vestibular afferents, resulting in more synchronized evoked potentials and greater oVEMP amplitude.
Käse, Mirjam. "Transkranielle Theta Burst Behandlung depressiver Patienten: Untersuchung der Wirkung auf evozierte Potentiale in einem Oddball Paradigma." Doctoral thesis, 2011. https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-69314.
Повний текст джерелаTranscranial magnetic stimulation was frequently used in treatment of depressive patients. We used a special paradigm called theta burst stiumlation to treat therapy resistant depressive patients for 2 weeks. Effectiveness was measured by questionaires, results in a cognitive task and event related potentials in EEG. Results show that there was a change in event related potentials in frontal brain areas. Clear evidence for an improvement of depressive symptoms could not be shown
Müller, Markus. "A candidate gene-based association study to investigate potentially adaptive genetic variation in European beech (Fagus sylvatica L.)." Doctoral thesis, 2013. http://hdl.handle.net/11858/00-1735-0000-0022-5E05-5.
Повний текст джерелаSferopoulos, Rodi. "Test burning of carpet and foam and potential interferences in identifying petrol in arson investigation by gas chromatography/ mass spectrometry." Thesis, 2013. https://vuir.vu.edu.au/24384/.
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