Download or read book The Effects of Short Term Narrowband Noise Exposure on Distortion Product Otoacoustic Emissions DPOAEs in Humans written by Barbara Ann Sudeyko and published by . This book was released on 1994 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Supplemental Magnesium on Temporary Threshold Shift written by Jenifer Leonard and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: The control group received a placebo pill that was identical in appearance to the magnesium pill. Following noise exposure, the greatest changes in DPOAE amplitude and SNR occurred for the frequencies that were one-half to one octave above the frequency of the stimuli used. The greatest changes in DPOAE measurements were present immediately post TTS-inducing stimulus, with only slight changes present after 30 minutes and no difference between 30 minutes and 60 minutes post-exposure. These results were the same for both groups. It was concluded that this dosage of supplemental magnesium had no apparent protective effect on DPOAEs following intense noise exposure.
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 Advances in Noise Research Volume 1 written by Deepak Prasher and published by John Wiley & Sons. This book was released on 1998 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: The series entitled Advances in Noise Research has developed from the European Commission Concerted Action Programme on Protection Against Noise (PAN) The first volume in the series is devoted to the biological effects of noise and covers six main topics: physiological mechanisms, diagnosis, otoacoustic emissions, tinnitus, pharmacology and non-auditory effects in relation to noise.
Download or read book Transient Evoked Otoacoustic Emissions TEOAEs Versus Distortion product Otoacoustic Emissions DPOAEs in Musicians After Noise Exposure written by Pui Shan Sandy Lai and published by . This book was released on 2002 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Proceedings of the International Symposium on the Effects of Noise on Hearing Scientific Basis of Noise Induced Hearing Loss 5th Held in Goetborg Sweden on 12 14 May 1994 written by and published by . This book was released on 1996 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biological Basis of Noise-Induced Hearing Loss, Sensory Cell Regeneration and Functional Recovery, The Effects of Acoustic Trauma, Other Cochlear Injury, and Death on Basilar-Membrane Responses to Sound, Excitotoxicity and Plasticity of IHC-Auditory Nerve Contributes to Both Temporary and Permanent Threshold shift, Noise-Induced Expression of Heat Shock Proteins in the Cochlea, Changes in Gene Expression Following Temporary Noise-Induced Threshold Shift, Genetic Susceptibility to Noise-Induced Hearing Loss in Mice, Effects of Acoustic Overstimulation on Distortion-Product and Transient-Evoked Otoacoustic Emissions, Physiological Correlates of Spontaneous Otoacoustic Emissions Induced by Acoustic Trauma, Cochlear Blood Flow Changes With Short Sound Stimulation, Individual Differences in Peripheral Sound Transfer Function, Relationship to NIHL, Experimental Studies of Noise-Induced Hearing Loss Underwater Hearing and Occupational Noise Exposure Threshold Shift Dynamics Following Interrupted Impact or Continuous Noise Exposure: A Review, Protection from Continuous, Impact, or Impulse Noise Provided by Prior Exposure to Low-Level Noise, Efferent and Priming Modulation of Noise-Induced Hearing Loss, Protection Against Temporary and Permanent Noise-Induced Hearing Loss by Sound Conditioning Psychophysical and Evoked Response Studies of Aged Subjects: Masking by Low-Pass Noise, Interactions Between Age-Related and Noise-Induced Hearing Loss, Application of Frequency and Time Domain Kurtosis to Assessment of Complex, Time-Varying Noise Exposures.
Download or read book The Feasibility of Including Distortion Product Otoacoustic Emissions DPOAEs in the Annual Medical Surveillance Test Battery for the Identification of Noise induced Hearing Loss in a Group of Workers in a Beverage Manufacturing Industry written by Tarryn Marisca Reddy and published by . This book was released on 2013 with total page 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 Characterizing the 2f1 f2 Distortion product Otoacoustic Emission and Its Generators Measured from 2 to 20 KHz in Humans written by Laura Elizabeth Dreisbach and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The cochlea produces recordable acoustic energy (otoacoustic emissions). These otoacoustic emissions occur spontaneously or can be evoked. Distortion-product otoacoustic emissions (DPOAEs) are produced by the intermodulation between the primary stimulus tones (f2 > f1) and occur at frequencies not present in the evoking acoustic stimuli. The 2f1-f2 DPOAE is well characterized for frequencies less than 8 kHz in humans; however, most basilar membrane measurements in animals have been made at higher frequencies. Thus, DPOAE measurements were extended to the higher frequency range of human hearing. High-frequency DPOAEs were characterized by how the DPOAE level varied with primary frequency separations (f2/f1) and stimulus levels and how the group delay estimate of the DPOAE varied with primary frequency. It was concluded that high-frequency DPOAEs continued the patterns seen for low-frequency DPOAEs, indicating that high-frequency DPOAEs are the result of the same biological process responsible for low-frequency DPOAEs.
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 The Effects of Background Noise on Distortion Product Otoacoustic Emissions and Hearing Screenings written by Amy E. Hollowell and published by . This book was released on 2012 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Physiology Psychoacoustics and Cognition in Normal and Impaired Hearing written by Pim van Dijk and published by Springer. This book was released on 2016-04-14 with total page 487 pages. Available in PDF, EPUB and Kindle. Book excerpt: The International Symposium on Hearing is a prestigious, triennial gathering where world-class scientists present and discuss the most recent advances in the field of human and animal hearing research. The 2015 edition will particularly focus on integrative approaches linking physiological, psychophysical and cognitive aspects of normal and impaired hearing. Like previous editions, the proceedings will contain about 50 chapters ranging from basic to applied research, and of interest to neuroscientists, psychologists, audiologists, engineers, otolaryngologists, and artificial intelligence researchers.
Download or read book Cumulated Index Medicus written by and published by . This book was released on 2000 with total page 1840 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Cochlea written by Peter Dallos and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 561 pages. Available in PDF, EPUB and Kindle. Book excerpt: Knowledge about the structure and function of the inner ear is vital to an understanding of vertebrate hearing. This volume presents a detailed overview of the mammalian cochlea from its anatomy and physiology to its biophysics and biochemistry. The nine review chapters, written by internationally distinguished auditory researchers, provide a detailed and unified introduction to sound processing in the cochlea and the steps by which the ensuing signals are prepared for the central nervous system.
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.
