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 Otoacoustic Emissions written by Martin S. Robinette and published by Thieme Medical Publishers. This book was released on 2002 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt: The method of otoacoustic emissions (OAE) was first developed in 1978 & is the first independent, non-invasive, completely objective measurement method of inner ear function. Written by a team of leading audiologists & filled with helpful illustrations, this best-selling book describes the scientific basis of otoacoustic emissions, the testing of normal & clinical populations, & OAE instrumentation. The authors place special emphasis on the proper interpretation of test results & on helping clinicians gain accuracy with OAE's in their everyday practice.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1999 with total page 898 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 1998 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Noise Health written by and published by . This book was released on 2001 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fine Structure DP grams of the 2F1 F2 Distortion Product Otoacoustic Emissions Measured as a Function of Stimulus Intensity and Proximity of Spontaneous Otoacoustic Emission Frequency written by Chris Chia-Hua Lin and published by . This book was released on 2004 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cumulated Index Medicus written by and published by . This book was released on 1998 with total page 1892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tuning Functions and Latencies of Distortion product Otoacoustic Emissions in Human Ears written by Zhiyi Zhou and published by . This book was released on 1998 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Estimating Mechanical Frequency Tuning Properties of the Cochlea with F 1 and F 2 sweep Distortion product Otoacoustic Emission Measurements in Normal Hearing Human Adults written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Distortion Product Otoacoustic Emissions in Canines written by Sara Hartson and published by . This book was released on 2021 with total page 77 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 Frequency Specificity of Contralateral Suppression of Distortion Product Otoacoustic Emissions written by Lisa Arnelle Ross and published by . This book was released on 2013 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: The frequency specificity of the contralateral suppression effect as demonstrated in DPOAEs was measured in 20 adult participants using contralateral stimuli consisting of white noise, and. 5, 1, 2, and 3 kHz tones with presentation levels of 40, 50, and 60 dB SPL. A significant suppression effect was found with white noise in the low frequencies (1.125 to 2.531 kHz) as well as higher frequencies (5.062 to 6.328 kHz). While not reaching a level of significance, 2 and 3 kHz demonstrated a similar suppression as white noise in the higher frequencies (5.062 to 6.328 kHz) and a non-significant enhancement effect was observed in the low frequencies (2.015 to 2. 812 kHz). Future studies of contralateral suppression should examine BBN with various high frequency cut offs in order to more fully examine these phenomenon.
Download or read book Dependence of the Distortion Product 2f1 f2 on Primary Levels in Normally Hearing Ears written by Sumitrajit Dhar and published by . This book was released on 1995 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Growth of Suppression Using Distortion product Otoacoustic Emission Measurements in Hearing impaired Humans written by Cori Birkholz and published by . This book was released on 2013 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Distortion Product Otoacoustic Emissions in Normal Hearing Humans Reveal Gender and Age Differences written by Christine E. Haugh and published by . This book was released on 1995 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
