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 26 for “"Auditory Evoked Potentials"”.
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Evaluation of Efferent Unmasking Using Cortical Auditory-Evoked Potentials
… may be attributed to differences in the auditory efferent system among individuals. The auditory efferent system can potentially improve SNRs through Medial Olivocochlear Reflex (MOCR)-mediated unmasking, as supported by animal studies. Nevertheless, it is not clear to what extent the …
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Towards artifact-free auditory evoked potentials in cochlear implant users
Cochlear Implantate (CIs) sind Prothesen, welche die Funktion der gesunden Cochlear imitieren. Dadurch können bei Personen mit einem sensorineuralen Hörverlust die Hörfunktionen wiederhergestellt werden. Eine noninvasive Methode, um die Rehabilitation des Hörsinnes nach der Implantation zu …
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Analysis of early auditory evoked potentials elicited by stimuli with directional information
… a neural correlate of spatial hearing in humans. Auditory brain stem responses (ABRs) and binaural difference potentials (BDs) to stimuli with interaural differences in time (ITD) and level (ILD) are measured and analyzed. In chap. 2 the advantage of using information from the raw data of a …
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Temporal and spatial aspects of hearing as revealed by auditory evoked potentials
… spatial acoustic stimuli on the generation of auditory evoked potentials (AEPs) was investigated. An optimized chirp stimulus was used, yielding responses with an improved signal-to-noise ratio. Using this stimulus, in Chap. 2 brainstem responses were shown to be not primarily evoked by …
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Auditory Evoked Potentials: the Effects of Sleep Deprivation and Recovery Time For the P300
Auditory Evoked Potentials (AEP) have been used as an objective measure of estimating hearing sensitivity and studying the integrity of the auditory neural pathways. The P300 is an endogenous AEP response that requires the subject to cognitively process the auditory signal in order to get a …
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Development of Realistic Stimuli for the Evaluation of Listening Effort using Auditory Evoked Potentials
… and qualitative measures using a variety of auditory stimuli ranging from simple tonal stimuli to complex speech stimuli, such as consonant-vowel syllables, words, and full sentences, but never in the context of a conversation. Real-life restaurant noise has also never been used in research …
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Independent component analysis and source analysis of auditory evoked potentials for assessment of cochlear implant users
Source analysis of the Auditory Evoked Potential (AEP) has been used before to evaluate the maturation of the auditory system in both adult and children; in the same way, this technique could be applied to ongoing EEG recordings, in response to acoustic specific frequency stimuli, from children …
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Synchronized Gamma Oscillations Underlying Mid-latency Auditory Evoked Potentials: Assessment of Effects of Psychopharmacologically Active Components of Tobacco
… study 2 (paired-pulse paradigm), in traditional evoked potential analysis, we observed signficant chronic sensory gating, as measured by the ratio of N40-P50 amplitude in response to the second tone (S2) as compared to the response to the first tone (S1). The effect was greatest at the …
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Electrophysiologic detection of the neurotoxic effects of acrylamide and 2,5-hexanedione in rats
Brain stem auditory evoked potentials (BAEP) and somatosensory evoked potentials (SEP), recorded from subcutaneously placed electrodes in anesthetized rats, were used to detect the neurotoxic effects of acrylamide and 2,5-hexanedione. Sixty adult male rats were equally divided into four groups: …
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Towards a neurophysiological correlate of the precedence effect: from psychoacoustics to electroencephalography
… shed light on the question on which stage of the auditory pathway information related to the precedence effect is processed. Investigations were made by means of psychoacoustics and auditory evoked potentials (AEPs). Elaborate preparative psychoacoustical measurements were performed in order to …
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Development of Auditory Sensitivity in Barn Owls (Tyto furcata pratincola)
… 12 kHz) and clicks of different rates (5-90 Hz). Auditory evoked potentials (AEPs) of the auditory nerve were recorded using the auditory brainstem response (ABR). Barn owl hearing matured in a similar trend to other developing vertebrates, including kittens, budgerigars, chickens, and gerbils. …
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The Development and Role of Peripheral Auditory Structures in <i>Otocinclus affinis</i>
… determined electrophysiologically by recording auditory evoked potentials (AEP). Swim bladder deflation increased hearing thresholds by 19 – 23 decibels (dB). I then tested the role of the compound pterotic bone fenestrae in hearing by covering them with a tissue adhesive (n-butyl cyanoacrylate) …
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Hearing Sensitivity and the Effect of Sound Exposure on the Axolotl (Ambystoma Mexicanum)
… axolotl or other salamander species. I recorded auditory evoked potentials (AEPs) of six axolotls at eleven frequencies (0.1, 0.25, 0.4, 0.6, 0.8, 1, 1.5, 2, 3, 4, and 6 kHz) in order to produce baseline audiograms of underwater pressure sensitivity. Individuals were then subjected to a 48-hour, …
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Estudo dos potenciais evocados auditivos de curta latência em pacientes diabéticos do tipo 2 sem sintomas auditivos
… Jordão reported a case of diabetic patient with auditory impairment. The incidence of subclinical central diabetic neuropathy is unclear due to difficulty in detecting latent alterations of central neural transmission process. Objective: The aim of this study is to evaluate the central …
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Hearing the Moment: Measures and Models of the Perceptual Centre
… a novel P-centre measurement method, based on auditory evoked potentials, is explored as a possible objective alternative to the conventional approaches examined earlier. The results are encouraging and suggest that a neuroelectric correlate of the P-centre does exist, thus opening up a new …
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Melanin as an Oto-Protective Pigment in Two Fish Species: <i> Poecilia Latipinna </i> and <i>Cyprinus Carpio </i>
… tone at 165 dB re 1 μPa for 48 h) by measuring auditory evoked potentials (AEPs). Melanin levels were associated with scale color, with black morphs having more inner ear melanin than white or golden morphs. TEM imaging showed that melanosome size varied among color morphs, with black P. …
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Feedback control of sedation and general anaesthesia
… the effects of the stimuli used lo generate auditory evoked potentials on consciousness levels and the BIS, during sedation and anaesthesia. No effect was found. Three studies of BIS-guided computer control of anaesthesia and sedation were performed. Control performance was assessed in terms …
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Investigation of the Function of the Olivocochlear Efferent Nerve Pathway in Humans
… and changes in the output measured at the auditory nerve. The pathway innervating one ear can be stimulated by presentation of sound to the contralateral ear. The roles of these pathways in hearing are not understood. The present research has investigated the perceptual effects of different …
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