Download or read book Measures of Distortion Product Otoacoustic Emissions and Frequency Resolution in Clinically Normal Hearing Subjects with a History of Noise Exposure written by Janet Caffee and published by . This book was released on 1997 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Distortion Product Otoacoustic Emission Components as a Potential Marker of Preclinical Noise Injury to the Cochleas written by Gavin Coad and published by . This book was released on 2013 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: Background: Excessive noise exposure can lead to noise induced hearing loss (NIHL) and hearing conservation programmes are essential to prevent occupational hearing loss. These programmes rely on monitoring hearing using pure tone audiometry. However, audiometry is not very sensitive and only detects a permanent hearing loss after significant injury has occurred. Distortion product otoacoustic emissions (DPOAEs) are generated by cochlear non-linear physiological processes associated with the outer hairs cells that underpin detection of sound, thus DPOAEs have promise as a tool to detect and monitor cochlear hair cell damage in NIHL. The DPOAE has two components, one generated at the point of interaction between the primaries (generator), the second reflected from the characteristic place of the DPOAE frequency (reflected). Some of the variability in DPOAE is believed to result from the interaction of the components, termed the DPOAE fine structure, and extracting the components may reduce the variability and improve the sensitivity of the DPOAE to injury. This study investigated the feasibility and reliability of a new approach to separating the DPOAE components, and their relationship to hearing measures in people with and without exposure to noise. Methods: Logarithmically swept primaries with a least-squares-fit (LSF) analysis were used to separate the DPOAE components, and the approach was evaluated and optimised in normally hearing subjects. Two studies followed that investigated the components of the DPOAE and how they correlate with behavioural measures of hearing. Firstly, in subjects (n=16) with 'normal' hearing (20 dB HL), both behavioural measures of the auditory filter (notched-noise maskers) and threshold were compared to the components of the DPOAE. In the second study subjects (108 men) with a mixture of thresholds, noise exposure and age were recruited and then divided into two equal sized and age matched groups (noise exposed and non-noise exposed) based on a detailed history of self-reported noise exposure. The DPOAE components were compared to audiometric threshold and behavioural measures of compressive nonlinearity using Schroeder-phase masked thresholds. Results: Overall, psychoacoustic measures of auditory filter and cochlear non-linearity were influenced by audiometric threshold, and exhibited no relationship with DPOAE level in subjects with 'normal' hearing (
Download or read book Order Effects and Number of Tone Pairs During Simultaneous Distortion Product Otoacoustic Emissions written by Erin Michelle Anderson and published by . This book was released on 2002 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Otoacoustic Emissions written by Martin S. Robinette and published by Thieme. This book was released on 2011-01-01 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new edition of a best-selling text with a CD-ROM by Dr. David Kemp The new edition of the best-selling Otoacoustic Emissions: Clinical Applications provides a thorough review of the complex physiology of the ear and clinical applications of the latest research on otoacoustic emissions. The book features new chapters on such important topics as middle ear function enhanced by reflectance measurements and the use of otoacoustic emissions as a preclinical measure of susceptibility to hearing loss. Accompanying the book is a CD-ROM developed by Dr. David Kemp, Ph.D., which contains animations, movies, and interviews. The CD-ROM serves as an indispensable aid to both teaching and reviewing key concepts. From physiological phenomena to diagnostic and clinical applications, this book is a complete reference on otoacoustic emissions that will provide graduates in audiology and residents in otolaryngology and otology with all the essential information needed for research and professional practice.
Download or read book Test retest Reliability of Distortion Product Otoacoustic Emissions in the High Frequency Range written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: (Uncorrected OCR) Abstract of dissertation entitled Test-retest Reliability of Distortion Product Otoacoustic Emissions in the High Frequency Range submitted by NG, Hoi-Yee Iris for the degree of Master of Science in Audiology at the University of Hong Kong in May 2002 In the current research study, distortion product otoacoustic emissions (DPOAEs) were measured in 35 young Chinese adults (61 ears) with normal audiometric thresholds using an IL096 OAE system with the default DP-gram protocols as well as user-defined DP spectrum protocols in the high frequency range. Two series of retest were conducted 20 minutes and an average of 15 days later, and the resolution setting for the DP-gram measurements was varied between 1 to 8 points per octave in each test series. Transient evoked otoacoustic emissions (TEOAEs) were also recorded in each test series for comparison purposes. Test-retest partial correlation and standard error of measurement (SEM) were computed to reflect the test-retest reliability of the OAE amplitudes, noise floor and signal-to-noise ratio. Results suggested that OAE amplitudes in the default frequency range (1 to 6 kHz) between test and retest were highly correlated with an average correlation coefficient of 0.85 and SEM was found to be an average of 2.4 dB, while signal-to-noise ratio and noise floor yielded lower correlation coefficients and higher SEMs. OAE amplitudes in the higher frequency range of 6.5 to 7 kHz were also significantly correlated between test and retest (correlation coefficient ranged from 0.74 to 0.80) with SEM from 2.7 to 3.5 dB. Yet DPOAEs at 8 kHz were present with a positive signal-to-noise ratio in only one-third of ears, were less test-retest correlated, and the amplitude revealed a high SEM of 5 dB. No apparent difference was demonstrated among various resolution settings and between short- and long- term retest. This implies that DPOAEs in the high frequency range (6.5 to 7 kHz) could be a potential clinical tool for mo.
Download or read book Measurement of Distortion Product Otoacoustic Emission Amplitudes Related to Aging and Middle Ear Resonant Frequency in Ears of Adults with Normal Hearing written by Fabiola A. Castro-Lauman and published by . This book was released on 2013 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Audiologie written by and published by . This book was released on 1996 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: Journal of auditory communication.
Download or read book Relations of Race and Gender to Distortion Product Otoacoustic Emissions written by Lara L. Gingerich and published by . This book was released on 1998 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Journal of Laryngology and Otology written by and published by . This book was released on 1998 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Change in Distortion Product Otoacoustic Emissions in Subjects at Risk for Noise induced Hearing Loss written by Meaghan Patrick Reed and published by . This book was released on 2002 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Relationships Between the Ipsilateral Masking of the Distortion Product Otoacoustic Emission and Frequency Resolution in Normal Hearing Adults written by Carol Anne Jardine and published by . This book was released on 1995 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Distortion Product Otoacoustic Emissions in Individuals with Noise Exposure and Presbycusis microform written by Carrie J. (Carrie Jane) Tobolski and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 2000 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evoked Otoacoustic Emissions EOAE s and Inner Ear Damage from Navy Occupation Noise Exposure written by and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to identify persons with early noise-induced cochlear damage and to predict susceptibility to future damage it is desirable to develop a test that is sensitive to effects of noise exposure on the auditory system. Traditionally, hearing has been monitored with behavioral methods requiring a threshold 10-15-dB shift to be considered significant. More recently otoacoustic emissions have been studied as a method, which may show earlier effects of noise exposure, and thus useful for hearing conservation programs. The aim of this project was to develop a test method applicable to the military population. Following a brief, intense noise, distortion product otoacoustic emissions (DPOAEs) were measured in normal hearing young adults for several conditions. Behavioral thresholds were measured using a Bekesy procedure. Experiment 1 involved a DPgram paradigm. F2 ranged from 1.0 to 4.0 kHz, with F2/F1=1.22. Stimulus levels were either L1=70 dB SPL, L2=60 dB SPL or L1=65 dB SPL, L2=45 dB SPL. The exposure was a 100 dB SPL, 1/3 octave band of noise centered at 1.41 kHz. Results showed a consistent decrease in behavioral thresholds at 2.0 kHz immediately following exposure. Only one of ten subjects showed a consistent decrease in DPOAE amplitude for any F2 frequency. In a second series of experiments, DFOAE input-output functions were obtained for F2-4.0 kHz, with F2/F1=1.22 and L1=L2+15 dB, before and after exposure to a 100 dB SPL, 1/6-octave band noise centered 2.28 kHz. Pre-exposure I/O functions were very stable. In response to low to moderate level stimuli, DFOAE amplitude tended to decrease immediately post-exposure, increase and then decrease again (i.e., bounce). While for both DP paradigms the time course of the DFOAE amplitude shifts roughly paralleled threshold shifts, there was significantly inter-subject and intra-subject variability.
Download or read book Cumulated Index Medicus written by and published by . This book was released on 1993 with total page 1488 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Otoacoustic Emissions written by Martin S. Robinette and published by . This book was released on 2007 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: CD-ROM contains powerpoint presentation of animated figures, image files of figures, interactive tutorial and movie.
Download or read book Gender Differences and Phase Delay Measurements for Distortion Product Otoacoustic Emissions in Normal Hearing Adults written by Cheryll Anne Benois Marie and published by . This book was released on 2001 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Frequency Following Response written by Nina Kraus and published by Springer. This book was released on 2017-01-09 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume will cover a variety of topics, including child language development; hearing loss; listening in noise; statistical learning; poverty; auditory processing disorder; cochlear neuropathy; attention; and aging. It will appeal broadly to auditory scientists—and in fact, any scientist interested in the biology of human communication and learning. The range of the book highlights the interdisciplinary series of questions that are pursued using the auditory frequency-following response and will accordingly attract a wide and diverse readership, while remaining a lasting resource for the field.
