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Dissertations / Theses on the topic 'Auditory evoked response'

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Published: 4 June 2021

Last updated: 1 August 2024

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1

Fassnidge, Christopher. "The visually-evoked auditory response." Thesis, City, University of London, 2018. http://openaccess.city.ac.uk/19689/.

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In synaesthesia a sensation in one modality triggers a consciously perceived sensation in another sensory modality or cognitive domain. In this thesis we investigate auditory sensation that are induced by dynamic visual stimuli, akin to hearing-motion synaesthesia (Saenz and Koch, 2008). We term this the Visually-Evoked Auditory Response (vEAR). We first establish the prevalence of vEAR in a random sample, with questionnaire responses indicating a higher prevalence (as many as 1 in 5) than canonical synaesthesias. We report that those who experience vEAR showed better performance compared to controls when discriminating between ‘Morse-code’ style rhythmic sequences in the visual domain, as did Saenz and Koch (2008). We also demonstrate that vEAR is perceptually real enough to interfere with hearing real world sounds. We then demonstrate that in control subjects Transcranial Alternating Current Stimulation (TACS), when applied over the temporal versus the occipital lobes, impairs auditory versus visual sequence discrimination respectively. However, temporal TACS improved visual and occipital TACS improved auditory sequence discrimination performance. This suggests the presence of normally-occurring mutual alpha-mediated competitive inhibition of the two cortices. This TACS effect was not seen in individuals with vEAR, indicating that their auditory and visual cortices are able to cooperate to perform the task despite disruption from TACS. Finally, we investigate the types of visual stimuli that best evoke vEAR, and the types of people who tend to experience it. We conducted a large online survey in which respondents rated the amount of vEAR evoked by a series of silent videos depicting types of motion. The predictiveness of a real-world sound was identified as a major contributor to ratings in all respondents, while motion energy (raw changes in light over space and time) specifically influenced ratings in those who experience vEAR. We also report demographic and trait questions relating to auditory perception that predict higher ratings, including the frequency one experiences music imagery in their head, or whether they have tinnitus or types of synaesthesia. We conclude that vEAR results from both high and low-level connectivity between the visual and auditory cortices and an atypical inhibition of these connections.

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2

Blumenfeld, Laura D. "Auditory evoked response suppression in schizophrenia /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 2001. http://wwwlib.umi.com/cr/ucsd/fullcit?p3015844.

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3

Biagio, Leigh. "Slow cortical auditory evoked potentials and auditory steady-state evoked responses in adults exposed to occupational noise." Diss., Pretoria : [s. n.], 2009. http://upetd.up.ac.za/thesis/available/etd-02222010-133535.

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4

Yeung, Ngan-kam Kammy, and 楊銀金. "Prediction of hearing thresholds: comparison of cortical evoked response audiometry and auditory steady stateresponse audiometry techniques." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B3049431X.

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5

Carey, Marc Brandon. "Brainstem auditory evoked potentials in anuran amphibians." PDXScholar, 1992. https://pdxscholar.library.pdx.edu/open_access_etds/4267.

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In this study, I looked at the effects of sound level, temperature and dehydration/hypernatremia on the brainstem auditory evoked potential (BAEP) of four species of anuran amphibians (Rana pipiens, Rana catesbeiana, Bufo americanus and Bufo terrestris). The BAEP was used because it allowed me to monitor both the peripheral and central aspects of auditory nervous function simultaneously and over a long period of time.

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6

Oyler, Robert Francis. "Within-subject variability in the absolute latency of the auditory brainstem response." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184820.

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The auditory brainstem response (ABR) is an evoked potential that has achieved widespread acceptance as a technique for evaluating the status and function of the auditory nervous system. For many diagnostic applications, the latency of an obtained ABR peak is compared to clinical norms. One who uses this approach makes some basic assumptions regarding between-subject and within-subject variability of latency. Although a great deal is known about between-subject variability of ABR latency, virtually nothing is known about such variability within a single subject. The purpose of this investigation was to describe the nature of within-subject variability of ABR latency. Nine male subjects participated in the study. Each met the following criteria: 10-12 years of age; normal speech and language development; normal academic progress; normal hearing; and, normal middle ear pressure. A repeated measures design was employed. Four sessions were scheduled for each subject and five ABRs were obtained at each session for each of three stimulus conditions: monaural left, monaural right, and binaural. Stimuli were 100 μs condensation clicks presented at 80 dB nHL. For each ABR peak, the within-subject distribution of latencies was analyzed with regard to symmetry, kurtosis, range, and standard deviation using the SPSSx "Descriptives" procedure. For every subject, variability of latency was observed. Most often, the latencies were normally distributed and the magnitude of variability was small. The variability of latency, as indexed by the standard deviation, was less within any single subject than is commonly reported for groups of subjects. It was concluded that: (a) standard parametric techniques would be appropriate for subsequent analysis of such data; and, (b) by establishing a baseline, the sensitivity of the ABR might be increased for certain within-subject monitoring applications.

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7

Friesen, Lendra M. "Speech-evoked auditory potentials in cochlear implant listeners /." Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/8239.

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8

Ciocca, Valter. "Effects of auditory streaming upon duplex perception of speech." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75866.

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When a formant transition (isolated transition) and the remainder (base) of a synthesized syllable are presented to opposite ears most subjects perceive two simultaneous sounds, a syllable and a nonspeech chirp. The isolated transition determines the identity of the syllable at one ear and, at the same time, is perceived as a chirp at the opposite ear. This phenomenon, called duplex perception, has been interpreted as the result of the independent operation of two perceptual modes, the phonetic and the auditory mode. In order to test this hypothesis, the isolated transition was preceded and followed by a series of identical transitions sent to the same ear. This streaming procedure weakened the contribution of the transition to the perceived phonetic identity of the syllable. This weakening effect could have been explained in terms of the habituation of an hypothetical phonetic feature detector sensitive to the repetition of identical transitions. For this reason, the same effect was replicated by capturing the isolated transition with others which were aligned on the same frequency-by-time trajectory as the isolated one. These findings are consistent with the idea that the integration of the transition with the base was affected by the operation of general-purpose auditory processes. This contrasts with the hypothesis that the phonetic mode integrated the dichotic stimuli independently of the auditory mode.

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9

Sallinen, Mikael. "Event-related brain potentials to changes in the acoustic environment during sleep and sleepiness." Jyväskylä : University of Jyväskylä, 1997. http://catalog.hathitrust.org/api/volumes/oclc/39009942.html.

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10

Smith, Ginny M. "Influence of age on auditory gating /." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1326.pdf.

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11

Walker, Jennifer. "The Maturation of Cortical Auditory Evoked Potentials in Children with Normal Hearing and Hearing Impairment." Thesis, University of Canterbury. Communication Disorders, 2008. http://hdl.handle.net/10092/2195.

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Cortical auditory evoked potentials (CAEPs) are a non-invasive tool that can provide objective information on the functioning of the auditory pathways. As a result, there is increasing use of these measurements to support the early implantation of cochlear implants in children. However, the maturation of CAEPs in children who have received cochlear implants is still not well understood. This study investigated five children who received cochlear implants prior to 3.5 years of age and compared their CAEP waveforms to five normal-hearing children who were matched for age and five normal-hearing children who were matched for time-in-sound. In addition, a case study was completed, comparing an age-matched child who received hearing aids prior to 3.5 years of age to one of the children with cochlear implants. The latencies and amplitudes of the positive and negative peaks (P1, N1, P2, and N2) of the CAEP waveforms were measured and analysed using statistical techniques, including one-way repeated measures ANOVA. Our hypothesis was that children who received cochlear implants prior to 3.5 years of age would have CAEPs similar to their age-matched peers with normal hearing. Additionally, it was expected that the two matched children with hearing instruments would have CAEP waveforms that are similar. The measurements recorded demonstrated no conclusive results between the children with cochlear implants and either of the normal hearing groups. In the case study, the latencies and amplitudes of the child with a cochlear implant were similar to those of the child with hearing aids, supporting the second hypothesis. This study highlights the need for further research on a larger scale in order to more clearly determine the manner in which CAEP waveforms mature in children with cochlear implants.

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12

Sonstrom, Kristine E. "Baseline Normative Brainstem Auditory Evoked Response in Special Operations Multi-Purpose Canines, Unclassified." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1439304660.

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13

Bosnyak, Daniel J. Roberts L. E. "Mechanisms and dynamics of the human auditory steady-state response /." *McMaster only, 2003.

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14

陳霞 and Har Chan. "Test-retest reliability of tone-burst evoked otoacoustic emissions." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31251006.

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15

Chan, Har. "Test-retest reliability of tone-burst evoked otoacoustic emissions /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19819250.

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16

Plourde, Gilles. "Human auditory steady-state response, electroencephalogram, and late auditory evoked potentials during general anesthesia." Thesis, University of Ottawa (Canada), 1990. http://hdl.handle.net/10393/5787.

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In order to identify neurophysiological correlates of the changes in the level of conciousness associated with general anesthesia, the 40 Hz auditory steady-state response (ASSR), the electroencephalogram (EEG) and the N1 and P3 components of the transient auditory evoked potential were recorded before anesthesia (pre-induction), at the onset of anesthesia (induction), during surgical anesthesia, at the time of emergence and during recovery from anesthesia. The amplitude of the ASSR, was reduced significantly during late induction and dropped below noise levels during surgical anesthesia. It increased during emergence and further increased during recovery although the amplitude during recovery was significantly less than pre-induction values. Total EEG power increased significantly after induction. The EEG median frequency and 95% quantile frequency decreased significantly during surgery and increased significantly during emergence. Muscle artifacts could account for many of the EEG changes. The results for the transient auditory evoked potential indicated that, except during emergence, detection was associated with clear N1 and P3 waves whereas undetection was not. The lack of either N1 and P3 for detection during emergence perhaps occurred because the patients were not yet fully conscious. (Abstract shortened by UMI.)

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17

Au, Lee-shing. "Relationship of evoked otoacoustic emission recordings to the resonant frequency of the external auditory canal /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B18497111.

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18

Stephenson, Mark Ray. "Human auditory brainstem response to dichotic click stimuli /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487267546983858.

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19

Presacco, Alessandro. "Evoked and Induced Activity in 40 Hz Auditory Responses." Scholarly Repository, 2008. http://scholarlyrepository.miami.edu/oa_theses/164.

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This study aims to investigate the evoked and the induced activity in 40 Hz auditory responses. The 40 Hz activity, also called Pb or P50 or P1 component, has a latency of 50ms and belongs to the category of MLRs (Middle latency responses), which occur right after Auditory Brainstem Responses (ABRs) between 15 and 80ms. Its importance is related to possible clinical applications such as anesthesia, schizophrenia and auditory development. In addition to this, evoked and induced activities at 40 Hz might play an important role in cognitive processing. Trains of right ear rarefaction clicks at the mean rate of 39.1 Hz, intensity of 50dB and duration of 100 were used to elicit the above mentioned activities. Three different sequences have been used: steady state, low jittered and medium jittered. Low jittered sequence has been the main sequence used to study the 40 Hz activity. The advantage of using this sequence is the fact that a deconvolution analysis can be performed and also the fact that it does not differ too much from the standard 40Hz steady-state sequence and this means that a resonance at 40 Hz can still be obtained. Ten healthy subjects (8 males and 2 females; ages ranging from 25 to 47), with no history of audiological or neurological hearing impairment were recorded. Informed consent was signed according to approved IRB protocols. All recordings were done in a sound-proof chamber (Acoustic Systems, Inc.) with subjects lying on a bed comfortably. The subjects were not asked to perform any tasks, but just to passively listen to the acoustical stimuli. Evoked and induced activities were recorded in response to the above mentioned acoustic stimuli. The deconvolution analysis showed that the peak of activity occurs around 152ms. Wavelets analysis has confirmed this observation and has also unveiled and induced activity in the low beta range. This induced activity seems to be strictly related to the evoked activity, as it seems to occur around 390ms, which corresponds to the situation where the 40 Hz evoked activity enters a steady state condition, which lasts until the last acoustic stimulus has been applied. The latter observation is again in accordance with the literature, where it is reported that the 40Hz evoked activity could reflect the initial coactivation of neural assemblies representing specific stimulus features. A change in such stimulus features could be reflected as induced oscillations occurring in the middle beta range (16-22 Hz).

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20

O'Neill, Barry Vincent. "The pharmacology of the loudness dependence of the auditory evoked potential (LDAEP)." Swinburne Research Bank, 2008. http://hdl.handle.net/1959.3/47108.

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Thesis (PhD) - Swinburne University of Technology, Brain Sciences Institute, 2008.
A thesis submitted for the degree of Doctorate of Philosophy, Brain Sciences Institute, Swinburne University of Technology - 2008. Typescript. Includes bibliographical references (p. 98-133)

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21

Guille, Valérie. "Is the loudness dependence of the auditory evoked potential a valid marker of serotonin function?" Swinburne Research Bank, 2007. http://hdl.handle.net/1959.3/31100.

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Thesis (PhD) - Swinburne University of Technology, Brain Sciences Institute, 2007.
A thesis for Doctor of Neuropsychopharmacology, Brain Sciences Institute, Swinburne University of Technology - 2007. Typescript. Includes bibliographical references (p. 138-164).

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22

Dille, Marilyn Louise Farnsworth. "The effects of stimulus intensity on the cognitive P3 evoked response /." Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/8255.

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23

Dean, Margaret Sue. "Comparisons of behavioral and electrophysiological measures of auditory dynamic range /." Full text (PDF) from UMI/Dissertation Abstracts International, 2000. http://wwwlib.umi.com/cr/utexas/fullcit?p3004251.

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24

區利成 and Lee-shing Au. "Relationship of evoked otoacoustic emission recordings to the resonantfrequency of the external auditory canal." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31250981.

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25

Lombard, F. D. "An investigation of the P300 event related potential across gender." Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-01312006-110751.

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26

陳翠鑫 and Chui-yam Jenny Chan. "Spontaneous and click-evoked otoacoustic emissions from normal hearingyoung adults: a racial comparison." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31250993.

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27

Chan, Chui-yam Jenny. "Spontaneous and click-evoked otoacoustic emissions from normal hearing young adults : a racial comparison /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B1973668X.

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28

Harkrider, Ashley Whicker. "The acute effects of nicotine on physiological responses from the auditory systems of non-smokers /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

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29

Feng, Dingxiang. "Contralateral suppression otoacoustic emissions : normative values for Chinese young adults /." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B22147032.

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30

Ajiboye, Francis. "The speech-evoked auditory brainstem response in adults : an objective test for the diagnosis of auditory processing disorders." Thesis, University College London (University of London), 2018. http://discovery.ucl.ac.uk/10045765/.

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INTRODUCTION: Confidence in the reliability and validity of a diagnosis of APD is currently low among clinical and professional groups, principally due to the lack of a gold standard test sensitive to APD, differences in accepted diagnostic criteria and considerable variability in clinical test batteries implemented. Listening difficulties associated with APD are also not exclusive to the disorder, and are frequently observed in individuals with alternative disorders such as specific language impairment, specific reading impairment, and attention deficit disorder. The research undertaken in this thesis attempts to identify subjective and objective measures that differentiate adults diagnosed with clinical-APD from oto-neurologically normal adults with no perceived hearing difficulties using a popular hearing inventory, three speech in-noise tests and the speech-evoked auditory brainstem response test. The Speech, Spatial and Qualities of Hearing Scale (SSQ), presents a rich array of communication environments that reflect the three-dimensional dynamic auditory world humans live in. It comprises three hearing subscales - speech intelligibility, spatial awareness and other qualities of hearing. The three speech-in-noise tests - Who Is Right, the Children’s Coordinate Response Measure with competing male-talker (CCRM1) and the Children’s Coordinate Response Measure with competing speech-shaped noise (CCRM2) assess different aspects of auditory cognition, (i.e., low level auditory processing and auditory attention). In all three speech tests the target signal and competing noise were presented simultaneously and dichotically via headphones, and an automatic adaptive approach was used to adjust the signal-to-noise ratio. The speech-ABR was elicited under monaural and binaural stimulation, with a 40ms /da/ consonantvowel syllable. Several measures can be used to characterise the speech-ABR onset response and frequency following response (FFR) including response timings, responses amplitudes, and stimulus versus response waveform correlation coefficients. METHODOLOGY: Normative data were derived for all three subscales of the SSQ Hearing Scale, for the three behavioural speech tests, and the speech-ABR, following the collection and analysis of data obtained from 52 adults with normal hearing and no reported listening difficulties. Research data for the same outcome measures were obtained from a clinical-APD group (n=21) and two smaller APD subgroups (a developmental-APD group comprising 10 subjects and an acquired- APD group consisting of 8 subjects). SUMMARY OF RESEARCH FINDINGS: SSQ self-reported hearing ability scores were significantly worse for the clinical-APD group (n=21) compared with the normal hearing control group (n=52) for the ‘speech intelligibility’ and ‘other qualities of hearing’ subscales at the 0.01 alpha level. Statistically significant group differences were also observed for CCRM1 and Who Is Right tasks - poorer scores were apparent for the clinical-APD group for both tests, providing some evidence for deficits in auditory attention and auditory processing in these subjects. No statistically significant group differences were observed for all speech-ABR response timings or key features of the FFR. Independent Sample T-tests did suggest that statistically significant group differences were apparent for V-A amplitude, V-A slope and V-A area; however these differences may be attributed to age and gender distribution differences between the two groups. 75% of the acquired-APD subjects failed the CCRM1 task (a test of auditory attention), compared with 30% of the developmental-APD group. 50% of the acquired-APD subjects failed the Who Is Right task (a test of auditory processing) compared with 10% of the developmental- APD group; and 50% of the acquired -APD group failed the CCRM2 task (a test of attentional allocation and/or auditory processing) compared with 10% of the developmental-APD group. Findings for the speech-ABR also revealed evidence for low level central auditory nervous system anomalies for both APD subgroups. Abnormalities in the speech-ABR FFR were observed in 30% of developmental-APD subjects compared with 62.5% of acquired-APD subjects; whilst mild anomalies were present in 20% of developmental-APD subjects compared with 37.5% of acquired-APD subjects for the onset response. Altogether these results provide evidence for the deficits in auditory cognition for both APD-groups. Although this test battery demonstrates low sensitivity overall for the developmental-APD group, it does show better sensitivity for the acquired-APD subjects who exhibit more severe deficits in auditory cognition.

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31

Chen, Wenxiong. "Neonatal hyperbilirubinemia long-term neurophysiological and neurodevelopmental outcomes /." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B37489380.

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32

Chen, Wenxiong, and 陈文雄. "Neonatal hyperbilirubinemia: long-term neurophysiological and neurodevelopmental outcomes." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B37489380.

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33

Ziegler, Michelle Ann Nielsen. "The interaction of stimulus rate and polarity effects on the auditory brainstem response." PDXScholar, 1989. https://pdxscholar.library.pdx.edu/open_access_etds/3957.

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Research on the Auditory Brainstem Response (ABR) has been dominated by attempts to develop techniques to enhance the clarity of the ABR waveform and to define the parameters that separate normal from abnormal responses. While the effects of stimulus rate are clearly documented, the effects of stimulus polarity on the ABR are not. There may be an interaction of polarity and rate which accounts for the inconsistent results reported in the literature. This study examined the effect of stimulus rate and polarity for waves I, III, and V, on the ABR latency, amplitude, and amplitude ratio. Rarefaction and condensation clicks were delivered at rates of 11.l; 21.1, 41.1, and 81.1 clicks per second. Fourteen male subjects were used, each having normal hearing thresholds and normal middle ear function.

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34

Costa, Faidella Jordi. "Regularity encoding in the auditory brain as revealed by human evoked potentials." Doctoral thesis, Universitat de Barcelona, 2011. http://hdl.handle.net/10803/78918.

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Acoustic regularity encoding has been associated with a decrease of the neural response to repeated stimulation underlying the representation of auditory objects in the brain. The present thesis encloses two studies that sought to assess the neural correlates of acoustic regularity encoding in the human auditory system, by means of analyzing auditory evoked potentials. Study I was conducted at the Cognitive Neuroscience Research Group, at the Faculty of Psychology of the University of Barcelona (Barcelona, Catalonia, Spain), under the direct supervision of Dr. Carles Escera. This study aimed to explore the dynamics of adaptation of the auditory evoked potentials to probabilistic stimuli embedded in a complex sequence of sounds. The main outcome of this study was the demonstration that the amplitude of auditory evoked potentials adapts to the complex history of stimulation with different time constants concurrently: it adapts faster to local and slower to global probabilities of stimulation. This study also showed that auditory evoked potential amplitudes correlate with stimulus expectancy as defined by a combination of local and global stimulus probabilities. Study II was conducted at the Institute of Child Health (ICH), at the University College of London (UCL; London, United Kingdom), under the direct supervision of Dr. Torsten Baldeweg. This study aimed to explore the influence of timing predictability in the neural adaptation to probabilistic stimuli. The main outcome of this study was the demonstration that timing predictability enhances the repetition-related modulation of the auditory evoked potentials amplitude, being essential for repetition effects at early stages of the auditory processing hierarchy.
La codificació de regularitats acústiques està associada amb la reducció de la resposta neuronal a l’estimulació repetida, essent la base de la representació dels objectes auditius al cervell. La present tesi doctoral inclou dos estudis que exploren els correlats neuronals de la codificació de regularitats acústiques al sistema auditiu humà, mitjançant l’anàlisi dels potencials evocats auditius. L’objectiu del primer estudi, realitzat al Grup de Recerca en Neurociència Cognitiva de la Facultat de Psicologia de la Universitat de Barcelona (UB) i sota la supervisió directa del Dr. Carles Escera, va ser el d’explorar les dinàmiques d’adaptació dels potencials evocats auditius a estímuls probabilístics en una complexa seqüència de sons. El resultat principal d’aquest estudi va ser la demostració de que l’amplitud dels potencials evocats auditius s’adapta a la historia complexa d’estimulació amb diferents constants temporals simultàniament: s’adapta més ràpidament a probabilitats d’estimulació locals que globals. Aquest estudi també va mostrar que l’amplitud dels potencials evocats auditius correlaciona amb l’expectància d’un estímul definida com a una combinació de probabilitats locals i globals d’estimulació. L’objectiu del segon estudi, realitzat al Institute of Child Health (ICH), de l’University College of London (UCL), sota la supervision directa del Dr. Torsten Baldeweg, va ser el d’explorar la influència de la predictabilitat temporal en l’adaptació de l’activitat neuronal a estímuls probabilístics. El resultat principal d’aquest estudi va ser la demostració que la predictabilitat temporal intensifica la modulació de l’amplitud dels potencials evocats auditius a la repetició dels estímuls, essent esencial pels efectes que la repetició exerceix en etapes primerenques de la jerarquía de processament auditiu.

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35

Majnemer, Annette. "The prognostic importance of the auditory brainstem evoked response (ABR) in high risk neonates /." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=64489.

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36

Burnett, Jennifer. "Effects of Exposure to Perinatal Ultrasound Radiation on Information Processing in the Auditory System." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1830.pdf.

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37

Clinard, C., Owen D. Murnane, and J. Tampas. "Auditory Steady-State Response: Test-Retest Reliability." Digital Commons @ East Tennessee State University, 2006. https://dc.etsu.edu/etsu-works/1900.

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38

Cook, Mandy Lee Hill. "Behavioral and auditory evoked potential (AEP) hearing measurements in odontocete cetaceans." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001769.

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39

Yousefi, Shahriar, and syousefi@swin edu au. "An investigation of the auditory brainstem response characteristics of people with Parkinson's disease." Swinburne University of Technology, 2004. http://adt.lib.swin.edu.au./public/adt-VSWT20050908.150124.

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This dissertation is the documentation for a Doctoral research program undertaken at the Industrial Research Institute of the Swinburne University of Technology (IRIS), in collaboration with the School of Biophysical Sciences and Electrical Engineering (BSEE), between the years of 2000 and 2004. The objective of the research work that was undertaken was to study the auditory brainstem response (ABR) characteristics of people with Parkinson�s Disease (PD) to determine whether or not these characteristics could form the basis of a tool for determining the presence of PD; the performance of medication, and disease progression. Prior to the commencement of this research, the gold-standard for PD diagnostics was considered to be autopsy, and the only tools available for assessment of living patients were fluoro-deoxyglucose (FDG) / fluoroDopa (FDopa)-based positron emission tomography (PET) or conventional (subjective) clinical testing. The use of PET was costly and impractical for monitoring disease progression. Clinical testing approaches, on the other hand, had a degree of subjectivity, leading to potential misdiagnoses with inadequately trained clinicians. It was therefore postulated that a low-cost technique based on conventional ABR testing equipment, which was readily available within the medical environment, could provide considerable benefits. In order to be useful as a tool, ABR would ultimately need to identify uniquely the presence of PD from other potential disorders, most notably multiple system atrophy (MSA) which was sometimes confused with PD. At the time this research was conducted, the prevailing method of differentiating PD from MSA was based upon magnetic resonance imaging (MRI). This research was only concerned with the first stage of such a research process � that is, determining whether the ABR of PD patients was fundamentally different to that of a control group. In undertaking the investigation, a significant component of the research involved drawing together research literature from a large number of sources in order to present a case that could present a reasonable research path for experimentation. The next stage of the research involved developing an experimentation program that could be used to compare the ABR characteristics of people with PD against a control group and, further, to compare the ABR characteristics of PD participants against their level of impairment, as measured on a conventional mobility test. In summary, the outcomes of the experimental process that was undertaken, and the statistical analysis of the outcomes, suggested that: (1) People with mild manifestations of PD, who were in an unmedicated state, had marked abnormalities in the amplitude of Wave III of their ABR waveform. (2) The amplitude of Wave III of the ABR waveform was sensitive to variations in PD medication levels. (3) The amplitude of Wave V of the ABR waveform was, to a lesser extent than Wave III, affected by the presence of PD and medication levels. (4) The latencies of Waves III and V of the ABR waveforms did not appear to be affected by the presence of PD or by variations in medication levels. This thesis presents the results of the experimental study, together with a statistical analysis of the significance of the outcomes and an evaluation of the limitations of the work that was carried out. The recommendations arising from the research outcomes suggest ways for extending the work that has been completed in this program.

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Polomac, Nenad [Verfasser], and Christoph [Akademischer Betreuer] Mulert. "Generators and connectivity of the early auditory evoked gammaband response / Nenad Polomac ; Betreuer: Christoph Mulert." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2020. http://d-nb.info/1208833987/34.

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41

Garrett, Andrew Richard. "The actions of dopamine receptors on sound-evoked and spontaneous activity in the inner ear." University of Western Australia. School of Biomedical, Biomolecular and Chemical Sciences, 2009. http://theses.library.uwa.edu.au/adt-WU2009.0164.

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[Truncated abstract] The mammalian cochlea receives an efferent innervation which originates in the superior olive. Known collectively as the olivocochlear system, this efferent innervation can be divided into lateral and medial systems. While the function of the lateral efferent system in the cochlea is still unknown, previous studies have identified both excitatory and inhibitory changes in sound-evoked and spontaneous cochlear responses attributable to the lateral efferent system. One of the neurotransmitters in the lateral efferents is the catecholamine dopamine, which in the central nervous system is known to exert inhibitory and excitatory effects by activating different receptor subtypes. The first experiments in this thesis were designed to determine if activation or blockade of different dopamine receptor subtypes in the cochlea could lead to both excitatory and inhibitory changes in sound-evoked and spontaneous cochlear responses. Adult guinea pigs were anaesthetised (Nembutal and Hypnorm) and highly specific D1/5 (SKF 38393, SKF 81297, SCH 23390), D2 ((+) PHNO, L 741, 626) and D3 (PD 128907, U 99194A) receptor agonists and antagonists were perfused through the cochlea for 15 minutes. Sound-evoked (compound action potential, summating potential, cochlear microphonic) and spontaneous cochlear responses were recorded before and after perfusion. Remarkably, activating or blocking D1/5 or D2 receptor subtypes resulted in the suppression of CAP amplitudes. These findings are paradoxical as the agonist data suggest that the D1/5 and D2 receptor subtypes are inhibitory, but the antagonist perfusions suggest that these receptors are excitatory. We propose that the presence of an agonist induces a process of receptor desensitisation which would elicit changes akin to receptor antagonism. If this is indeed the case then our agonist findings are spurious and require further interpretation. ... The suppression of the cochlear microphonic suggests that dopamine receptor influence is not confined to the primary afferent dendrite may also include the active process of the outer hair cells. The D1/5 and D2 antagonist data also suggests that dopamine receptors are activated by intrinsic dopamine. Therefore, we attempted to investigate the effects of putative dopamine depletion of the cochlea and found that application of the dopaminergic neurotoxin MPTP causes changes in both neural and hair cell responses which have not been reported before. However, we also demonstrated that tyrosine hydroxylase positive nerve fibres are still present in MPTP treated cochleae which suggests that dopamine is still present in these cochleae. Furthermore, we observed significant electrophysiological changes in these same cochleae when these were exposed to a D2 receptor antagonist which again supports the presence of intrinsic dopamine in these 'depleted cochleae'. These data suggest that the currently accepted method of acute dopamine depletion using MPTP is insufficient and different methods must be developed in the future.

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Lord-Maes, Janiece Marie. "Short latency evoked potentials and intra-individual variability in children." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184623.

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Individual differences in learning with a focus on neuropsychologic anomalies underlying learning strategies has been receiving attention in recent years. As a result, interest has increased in quantifying and analyzing cognitive behavior more directly. One of the tools that measures brain activity directly is the evoked potential (EP). This study investigated the EP recorded from the brainstem region, often referred to as brainstem auditory evoked response (BAER). The importance of BAERs in detecting pathology in the brainstem has been well documented. BAERs have also been advocated as an important tool in the electrophysiological assessment of children's brainstem function relative to learning disorders. BAER latencies were recorded, therefore, from a small group of average children and studied in relation to the BAER stability overtime. Intra-individual differences were compared to between-subject differences. So little BAER research has been performed with children that more studies are needed just to clarify normal variability of BAER parameters. The present investigation studied intra-individual differences in the stability of BAER latencies over time in young subjects with normal hearing, for comparing with and contrasting to previous results from a study using an adult sample. BAER latencies were recorded for left, right, and binaural ear presentations. A coefficient of stability (CS) was calculated for each peak, for each ear over time. ANOVA results showed significance for peak and peak by ear interaction. Several BAER parameters were examined within-subjects that may not be revealed in studies between-subjects. Profiles for intra-aural differences over time showed individual differences in the stability of the BAER. Although there appeared to be a trend toward inter-ear differences the differences did not reach significance. The profiles indicated considerable intra-aural pattern replicability, and a trend toward increase in stability over time. The results supported a need for future research on laterality studies, more age specific normative data and correlational studies in relation to individual cognitive differences.

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Felder, Shannon N. "Survey of auditory brainstem response referral criteria / by Shannon N. Felder." University of South Florida, 2001. http://purl.fcla.edu/fcla/etd/SFE0000016.

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Professional research project (Au.D.)--University of South Florida, 2000.
Title from PDF of title page.
Document formatted into pages; contains 48 pages.
Includes bibliographical references.
Text (Electronic thesis) in PDF format.
ABSTRACT: The primary objective of the project was to survey recognized "experts" in the field of neurodiagnostic audiology and practicing audiologists regarding their referral criteria and referral patterns for administering an auditory brainstem response test (ABR). For purposes of this study, "expert" was defined as any recognized audiologist with at least two or more publications and/or seminarsin the field of auditory evoked potentials.
Responses of experts and practicing audiologists were compared and contrasted to establish: a) if there was a standard referral pattern; b) what, if any, were the apparent critical components of referral patterns; and, c) whether or not current practice reflected the utilization of such critical components. The survey was designed to establish whether the respondent was practicing, in what type of practice setting, and how often ABRs were performed. Specificity and sensitivity of ABR outcomes was also requested.
The survey was administered verbally, via telephone, to 3 experts and was sent via e-mail to 178 randomly selected audiologists in the United States. Of the latter 53 returned, 38 reported conducting ABRs. Thus, data analysis was reported on 38 respondents. The survey results did not reveal a consistent standard referral pattern. Critical components for referral were hypothesized based on the "expert" majority response. These include ABR referral based on the presence of: (1) asymmetric sensorineural hearing loss; (2) unilateral tinnitus; (3) positive reflex decay; and, (4) word recognition rollover. The majority of "non-expert" practitioners surveyed reported that these symptoms warranted consideration for referral, thus reflecting utilization of apparent critical components.
System requirements: World Wide Web browser and PDF reader.
Mode of access: World Wide Web.

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Stroebel, Deidré. "The clinical value of the auditory steady state response for early diagnosis and amplification for infants (0 - 8 months) with hearing loss." Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-03222007-190636.

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Kritzinger, Mieke. "Cortical Auditory Evoked Potential (CAEP) and the chirp Auditory Steady State Response (ASSR) in predicting behavioural hearing thresholds in adults with sensorineural hearing loss." Diss., University of Pretoria, 2019. http://hdl.handle.net/2263/73231.

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Abstract Purpose: To compare the frequency specific Cortical Auditory Evoked Potential (CAEP) and the chirp-evoked 40 Hz Auditory Steady State Response (ASSR) with equivalent residual noise levels for behavioural threshold prediction in adults with normal hearing and with SNHL. Method: The study tested 23 adults with normal hearing and 20 adults with SNHL. The participants were aged between 18–65 years. A repeated measures within- participant descriptive design was used to collect the quantitative data. The participants underwent behavioural pure tone, CAEP and ASSR testing on the same day. Results: Similar CAEP difference scores across frequencies for the participants with normal hearing (mean=12.32-14.40 dB) and with SNHL (mean=10.00-16.47 dB) were measured. However, for the ASSR difference scores across frequencies slightly smaller difference scores were measured for the participants with SNHL (mean=10.17-17.30 dB) than for the participants with normal hearing (mean=11.74- 17.14 dB). CAEP thresholds were significantly closer to the behavioural pure tone thresholds at 500 (p=0.028; mean absolute difference 14.40 dB) and 2000 (p=0.016; mean absolute difference 12.56 dB) Hz for participants with normal hearing. In participants with sensorineural hearing loss, CAEP and ASSR thresholds were measured at similar sensation levels and were not statistically different (p>0.05). Conclusion: For the purpose of threshold estimation, representing the auditory function to the level of the auditory cortex the CAEP was closer to the behavioural hearing thresholds than the 40 Hz ASSR at all frequencies except at 4000 Hz, regardless of the hearing sensitivity. Keywords: Auditory steady state response (ASSR), Cortical auditory evoked potential (CAEP), Auditory evoked potential (AEP), Residual noise, Signal to noise ratio (SNR), objective threshold estimation, awake adults.
Dissertation (MA (Audiology))--University of Pretoria, 2019.
Speech-Language Pathology and Audiology
MA Audiology
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Briceno, Jose Alejandro. "Analysis of the Generation of Auditory Steady-State Cortical Evoked Responses in Guinea Pigs." Scholarly Repository, 2008. http://scholarlyrepository.miami.edu/oa_theses/146.

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Recent research shows that human auditory steady-state responses (ASSRs) develop a resonance at 40 Hz and the dramatic amplitude increase of the Pb component of the middle latency response (MLR) accounts for the high amplitude of the ASSR at 40 Hz. The first part of this study aimed to investigate the ASSR resonance characteristics as a function of rate in guinea pigs. A study of the grand average of the peak-to-peak and fundamental frequency amplitudes does indeed show a resonance around 40 Hz in guinea pigs. Unlike human ASSRs, this resonance is very broad (26-52 Hz) and flat. The centrally recorded ASSRs are smaller and tend to have resonances at higher rates compared to temporal signals. The second part of the analysis investigated whether the superposition of transient responses can predict the acquired ASSRs at each corresponding rate. This superposition theory is one of two competing theories on the origin of the ASSRs, with the other centering on the induced phase synchronization of brain waves. In order to test the first theory, transient responses were used to create synthetic ASSRs, which were then compared to the acquired ASSRs via correlation coefficient and phasor analysis. For the 40 Hz ASSR, both temporal and central electrode synthesized ASSRs show a correlation coefficient above 0.80. In the comparison at 20 Hz, the correlation coefficient is very high (about 0.9) in the temporal electrode, yet significantly lower (about 0.7) for the central electrode. Furthermore, at 80 Hz, the correlation coefficient is significantly lower in both temporal and central electrodes (about 0.7). At all rates, the correlation coefficients are highest with low jitter sequences. Finally, phasor analysis was also used to test the superposition theory of the generation of the acquired ASSRs at 20, 40, and 80 Hz. Overall, in the temporal recordings at 40 Hz, the superposition of the MLR responses accurately predicted the acquired 40 Hz ASSR as demonstrated by both magnitude and phase analysis. The recordings made in the central electrode only predicted the acquired ASSR in its phases, with significant differences found in magnitude at its main harmonics. Similarly, at 20 and 80 Hz in both temporal and central electrodes, the synthetic ASSRs did not appear to fully predict the acquired ASSRs. Although the phases were successfully predicted, large magnitude variations were observed. As shown by mean prediction error plots, the acquired ASSRs are best predicted by low jitter sequences, followed by low-medium and medium jitter sequences.

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Samimi, Hamed. "Automatic Recognition of Speech-Evoked Brainstem Responses to English Vowels." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/32975.

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The objective of this study is to investigate automatic recognition of speech-evoked auditory brainstem responses (speech-evoked ABR) to the five English vowels (/a/, /ae/, /ao (ɔ)/, /i/ and /u/). We used different automatic speech recognition methods to discriminate between the responses to the vowels. The best recognition result was obtained by applying principal component analysis (PCA) on the amplitudes of the first ten harmonic components of the envelope following response (based on spectral components at fundamental frequency and its harmonics) and of the frequency following response (based on spectral components in first formant region) and combining these two feature sets. With this combined feature set used as input to an artificial neural network, a recognition accuracy of 83.8% was achieved. This study could be extended to more complex stimuli to improve assessment of the auditory system for speech communication in hearing impaired individuals, and potentially help in the objective fitting of hearing aids.

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Hill, Evan M. "A Comparison of Behavioral and Auditory Brainstem Response Measures of Conductive Hearing Loss in Humans." Connect to full text in OhioLINK ETD Center, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=toledo1255724183.

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Thesis (M.A.)--University of Toledo, 2009.
Typescript. "Submitted as partial fulfillment of the requirements for The Master of Arts in Psychology." "A thesis entitled"--at head of title. Bibliography: leaves 28-30.

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Schweinzger, Ivy A. "Examining the Physiologic Phenotype of Cochlear Synaptopathy Using Narrowband Chirp-Evoked Compound Action Potentials." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1573811742950316.

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Feng, Dingxiang, and 馮定香. "Contralateral suppression otoacoustic emissions: normative values for Chinese young adults." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31251080.

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