Download or read book The Prediction of Behavioral Hearing Thresholds in Normal Hearing Subjects Using Brain Stem Electric Responses to Constant Bandwidth and Constant Q Acoustic Stimuli written by Gregory James Frazer and published by . This book was released on 1981 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1984 with total page 914 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1981 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1982 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Accuracy of Bone conduction Auditory Brainstem Response ABR in Predicting Bone conduction Behavioral Thresholds in Normal hearing Adults written by Mary Carson and published by . This book was released on 2013 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bone-conduction behavioral thresholds and bone-conduction auditory brainstem response (ABR) thresholds were recorded to 500 and 2000 Hz tonal stimuli in 15 normal hearing adult subjects in order to determine the accuracy of the bone-conduction ABR in predicting bone-conduction behavioral thresholds in this clinical population. Results revealed mean difference scores between the bone-conduction ABR threshold and the bone-conduction behavioral audiometric threshold of 7.67 dB at 500 Hz and 4.33 dB at 2000 Hz. In addition, 93% of the bone-conduction ABR threshold estimations were within 10 dB of the behavioral audiometric threshold at 500 Hz and 100% of the bone-conduction ABR threshold estimations were within 10 dB of the behavioral audiometric threshold at 2000 Hz. These findings indicate that the bone-conduction ABRs to 500 and 2000 Hz brief tonal stimuli can be used to accurately estimate pure-tone behavioral audiometric thresholds at these two test frequencies in adults with normal hearing sensitivity.
Download or read book Accuracy of Behavioral Threshold Approximations Based Upon Evoked Potential Thresholds written by Gerianne Pandolfi and published by . This book was released on 1986 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modeling the Auditory Brain Stem Response from Cochlear Impaired Ears Using High pass Masked Derived Band Responses written by Yvonne Satterblom Sininger and published by . This book was released on 1984 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Use of Simulation Techniques to Investigate the Effects of Conductive Hearing Loss on the Auditory Brainstem Response written by Molly Bishop and published by . This book was released on 2018 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: A click-evoked Auditory Brainstem Response (ABR) was recorded on 28 normal hearing adult participants to determine the effects of different degrees of conductive hearing loss on the response properties of the ABR. Participants were divided at random into two groups: the normal hearing group and the simulated conductive hearing loss group. In the normal hearing group, baseline behavioral pure tone audiometry from 250-8000 Hz and acoustic immittance testing (tympanometry and contralateral acoustic reflex thresholds from 500-2000 Hz) were performed to ensure normal hearing and middle ear function. Then, ABR testing was performed in both right and left ears to click stimuli beginning at 80 dBnHL. Stimulus intensity was decreased in 10 dB increments until a stimulus intensity of 30 dBnHL was reached. At stimulus intensities less than 30 dB nHL, stimulus intensity was decreased in 5 dB increments until the participant's ABR threshold was determined. In the simulated conductive hearing loss group, baseline behavioral pure tone audiometry from 250-8000 Hz and acoustic immittance testing (tympanometry and contralateral acoustic reflex thresholds from 500-2000 Hz) were performed to ensure normal hearing and middle ear function. Then, 5 mm of moleskin was placed in the tubing for the ER3A insert receivers and pure tone air conduction thresholds were re-measured in each ear. For the conductive group, the ABR was recorded using the ER3A insert receivers with moleskin. The ABR was recorded in both right and left ears to click stimuli beginning at 80 dBnHL. Stimulus intensity was decreased in 10 dB increments until a stimulus intensity of 60 dBnHL was reached. At stimulus intensities less than 60 dBnHL, stimulus intensity was decreased in 5 dB increments until the participant's ABR threshold was determined. For both groups, results revealed an increase in the mean absolute latencies of waves I, III, and V as stimulus intensity decreased. In contrast, results showed a decrease in the mean peak-to-peak amplitudes for waves I-I' and V-V' as a function of stimulus intensity. Mean interpeak latency values were consistent across stimulus intensities. Mean absolute latency values for all waves were greater for the simulated hearing loss group than the normal hearing group. In contrast, the mean peak-to-peak amplitude values for waves I-I' and V-V' were smaller for the simulated hearing loss group than the normal hearing group. These results were compared to previous data collected in the ABR literature on both normal hearing and conductive hearing loss participants. Results for both groups in the current study were in good agreement with the ABR literature as seen in the mean ABR values and the variability represented by standard deviation measurements. The data collected from this study will be used to develop a parametric approach to generating simulated responses for the commercially available Auditory Brainstem Response (ABR) recording simulator, ISAO by Intelligent Hearing Systems. This data will serve as basis for developing functions of response characteristics such as peak latency and amplitude as well as recording parameters like intensity, rate and stimulus characteristics. Further research should be conducted to determine the effects of other stimulus parameters on the ABR. These stimulus parameters include rate, polarity, and frequency.
Download or read book The Neural Representation and Behavioral Detection of Frequency Modulation written by and published by . This book was released on 2016 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding a speech signal is reliant on the ability of the auditory system to accurately encode rapidly changing spectral and temporal cues over time. Evidence from behavioral studies in humans suggests that relatively poor temporal fine structure (TFS) encoding ability is correlated with poorer performance on speech understanding tasks in quiet and in noise. Electroencephalography, including measurement of the frequency-following response, has been used to assess the human central auditory nervous system's ability to encode temporal patterns in steady-state and dynamic tonal stimuli and short syllables. To date, the FFR has been used to investigate the accuracy of phase-locked auditory encoding of various stimuli, however, no study has demonstrated an FFR evoked by dynamic TFS contained in the modulating frequency content of a carrier tone. Furthermore, the relationship between a physiological representation of TFS encoding and either behavioral perception or speech-in-noise understanding has not been studied. The present study investigated the feasibility of eliciting FFRs in young, normal-hearing listeners using frequency-modulated (FM) tones, which contain TFS. Brainstem responses were compared to the behavioral detection of frequency modulation as well as speech-in-noise understanding. FFRs in response to FM tones were obtained from all listeners, indicating a reliable measurement of TFS encoding within the brainstem. FFRs were more accurate at lower carrier frequencies and at shallower FM depths. FM detection ability was consistent with previously reported findings in normal-hearing listeners. In the present study, however, FFR accuracy was not predictive of behavioral performance. Additionally, FFR accuracy was not predictive of speech-in-noise understanding. Further investigation of brainstem encoding of TFS may reveal a stronger brain-behavior relationship across an age continuum.
Download or read book The Auditory Brainstem Responses and Acoustic Reflex Thresholds in a Normal hearing Elderly Population written by Debra Jean Hashimoto and published by . This book was released on 1983 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Accuracy of Auditory Steady State Response ASSR for Prediction of Behavioral Pure tone Thresholds written by Ryan Potter and published by . This book was released on 2013 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study attempted to determine the most appropriate clinical protocol for using the Auditory Steady-State Response for the prediction of pure tone behavioral thresholds. Behavioral and Auditory Steady-State Response thresholds were measured at 500 - 4000 Hz from sixteen normal-hearing subjects. All subjects were tested using both the single-frequency ASSR test approach as well as the multiple-frequency ASSR test approach in an attempt to determine which approach was the most accurate predictor of behavioral pure-tone thresholds. Additional test parameters, such as the EEG recording channel (ipsilateral versus contralateral) and overall test duration were evaluated in order to determine the most appropriate clinical protocol for obtaining Auditory Steady-State Response thresholds. The results of this study revealed that using a combination of the multiple-frequency ASSR test approach to initially bracket threshold and the single-frequency ASSR test method to better define threshold would most likely yield the most accurate estimation of pure-tone behavioral thresholds in the most acceptable amount of time. The study also determined that a two channel recording (ipsilateral and contralateral) should be employed to yield the most sensitive ASSR thresholds.
Download or read book Multiple Brainstem Auditory Steady state Response Interactions for Different Stimuli written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Auditory steady-state responses (ASSRs) have been shown to be accurate in predicting thresholds of individuals with hearing loss. Although new stimuli are being proposed and clinically implemented, there are no data to indicate whether response interactions would be adversely affected by their use. This study investigated the effects of three different stimuli (AM, AM/FM and AM2) at two different intensities (60 dB HL and 80 dB HL) on response amplitudes and interactions in normal-hearing adults. Stimuli were generated by the Rotman MultiMASTER research system and presented via air conduction through EAR-3A insert earphones. Carrier frequencies of 0.5, 1, 2, and 4 kHz were 80-Hz modulated in three conditions: individually (monotic single; MS), simultaneously in one ear (monotic multiple; MM), and simultaneously in both ears (dichotic multiple; DM). It was predicted that stimuli with broader spectra would result in greater amplitudes. This was demonstrated in the MS condition by the AM/FM stimulus, which evoked responses significantly larger than those to both AM and AM2 stimuli at all frequencies except 0.5 kHz at 60 and 80 dB HL. In the multiple (MM and DM) conditions, response amplitudes to AM2 were significantly larger than AM and AM/FM response amplitudes at both intensities. It was also predicted that more interactions would be found when using stimuli with broader spectra, even at moderate intensities. This was illustrated by the drop in amplitude by the AM/FM stimulus in the multiple conditions versus in the single condition, even at 60 dB HL. Relative efficiency values in the multiple conditions were never less than that found in the single condition at 60 dB HL; at 80 dB HL, the majority (83%) of comparisons were more efficient in the multiple conditions than the single condition. Based on these results, the optimal stimulus to use appears to be dependent on the chosen condition. In the single condition, AM/FM stimuli result in the largest response amplitud.
Download or read book The Effect of Rate of Stimulus Presentation on the Auditory Brainstem Response on Normal Hearing and Hearing Impaired Subjects written by Lois A. Sutton and published by . This book was released on 1979 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Comparison of Behavioral and Auditory Brainstem Response Measures of Conductive Hearing Loss in Humans written by Evan M. Hill and published by . This book was released on 2009 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: The auditory brainstem response (ABR) is an electrophysiological measure of hearing commonly used to detect hearing loss. Indeed, comparisons of ABR and behavioral thresholds have indicated that the two measures are, on average, highly correlated. However, recent research using rats has indicated that although the ABR may be correlated with behavioral measures of hearing, it does not reliably measure the degree of sensorineural threshold shift caused by exposure to loud sound. Considering these findings, the purpose of this study was to determine if the ABR can reliably estimate the degree of threshold shift caused by a conductive hearing loss. This was done by measuring the ABR and behavioral threshold shifts caused by placing an earplug in the ears of normal human observers. The results indicated that although the ABR was fairly accurate in estimating mean threshold shift for a group, it did not accurately estimate individual threshold shifts.
Download or read book Computational Models of the Auditory System written by Ray Meddis and published by Springer Science & Business Media. This book was released on 2010-06-16 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Springer Handbook of Auditory Research presents a series of comprehensive and synthetic reviews of the fundamental topics in modern auditory research. The v- umes are aimed at all individuals with interests in hearing research including advanced graduate students, post-doctoral researchers, and clinical investigators. The volumes are intended to introduce new investigators to important aspects of hearing science and to help established investigators to better understand the fundamental theories and data in fields of hearing that they may not normally follow closely. Each volume presents a particular topic comprehensively, and each serves as a synthetic overview and guide to the literature. As such, the chapters present neither exhaustive data reviews nor original research that has not yet appeared in pe- reviewed journals. The volumes focus on topics that have developed a solid data and conceptual foundation rather than on those for which a literature is only beg- ning to develop. New research areas will be covered on a timely basis in the series as they begin to mature.
Download or read book Correlation of Neurophysiological Behavioral and Hearing Performance Thresholds in Cochlear Implanted Rats written by Sarah Buchholz and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: In cochlear implant (CI) patients, a variety of objective markers are available to determine the response of the auditory system to electrical intracochlear stimulation. However, determining the optimal stimulation intensity can be challenging, and it remains open which objective marker is most useful for choosing appropriate stimulation intensities. This project investigates the correlation between neurophysiological and behavioral threshold markers and their relation to in fact behaviorally visible good hearing performance. We supplied neonatally deafened Wistar rats with bilateral CIs in young adulthood and trained them on a sound lateralization task. The rats received training sessions at different stimulation intensities, and intensity thresholds of good interaural time difference (ITD) performance were identified. In addition, electrically evoked auditory brainstem responses (eABRs) were recorded regularly and behavioral thresholds were determined. The mean lowest threshold across all three markers was identified for the behavioral response (x̅=-10.5 dB, 0 dB=100 μA). In comparison, the mean eABR threshold (x̅=-0.6 dB) was 9.9 dB above the behavioral threshold. The mean intensity threshold for good ITD performance (x̅=1.9 dB) was only 2.5 dB above the eABR threshold but 12.8 dB above the behavioral threshold of our CI rats. Our results indicate that neurophysiological (eABR) thresholds can overestimate behavioral thresholds but are closer to intensity thresholds for good ITD performance. Therefore, we propose a stimulation intensity of at least 2-3 dB above eABR threshold to achieve good hearing performance with CIs. Overall, we showed the importance of correlating different objective markers to get an impression of the wide perceptual range under CI stimulation
Download or read book High Frequency Hearing Loss written by Gene K. Balzer and published by . This book was released on 1983 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
