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 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 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 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 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 Cumulated Index Medicus written by and published by . This book was released on 1990 with total page 1476 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 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 Normative Distortion Product Otoacoustic Emissions DPOAEs Data Using the GSI 60 DPOAE Obtained in a Group of Normal Hearing Adults written by Nivrithi Behari and published by . This book was released on 1999 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Correlation Between Hair and Eye Colour on Contralateral Suppression of Otoacoustic Emissions written by Marike Klopper and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Noise-induced hearing loss (NIHL) is becoming increasingly prevalent amongst young adults leading to a whole series of social and public health problems. Genetics and environmental factors frequently influence individual℗þs susceptibility to hearing loss. It is postulated that melanin in the inner ear is related to individual℗þs susceptibility to NIHL. General pigmentation in turn, it is suspected to be related to the amount of pigmentation in the inner ear. The amount of melanin in the inner ear is said to modulate the endocochlear potential and provide an otoprotective effect. The current study aimed to determine the relationship between the contralateral suppression of otoacoustic emissions (CSOAE) in individuals with different hair and eye colour, and temporary emission shift (TES) after short-term noise exposure. Method: The hearing sensitivity of young adults were determined by using pure tone audiometry followed by CSOAE℗þs and distortion product otoacoustic emissions (DPOAE) before listening to music for one hour individually. Pure tone audiometry and DPOAE℗þs were repeated after short-term music exposure to determine the amount of TES and temporary threshold shift (TTS). Twenty-five normal-hearing adults, ranging from 18 to 28 years (Mean age: 21.64, SD: 1.80) were recruited for the current study. A quasi-experimental repeated within subject℗þs measurement design was used to compare the CSOAE in subjects with different hair and eyes colour with TES after noise exposure for one hour. Results: No statistically significant difference was measured between the participants with brown eyes and brown hair, and the participants blue eyes and blond hair, efferent suppression as measured by CSOAE℗þs. The blue eyes with blond hair had a temporary threshold shift (TTS) at 4000 Hz as well as a TES in at 2000 Hz after short-term noise exposure. Conclusion: CSOAE℗þs were therefore unable to predict which group of individuals were more susceptible to NIHL after short-term noise exposure.

Download or read book Repeatability and Variability of Distortion Product Otoacoustic Emissions in Normally Hearing Young Adults written by Samantha Bennett and published by . This book was released on 1994 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comparison of Distortion Product Otoacoustic Emission Amplitude Between Normal Hearing Male and Female Subjects Journal of the Royal Medical Services 2014 Vol 21 No 1 written by Shawkt Al-Tamimi and published by . This book was released on 2014 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Establishment of Norms for the Detection Thresholds of Distortion Product Otoacoustic Emission Input output Growth Curves in Normal Hearing Adults written by K. Wemmer and published by . This book was released on 1996 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Cochlear Mechanics and Otoacoustic Emissions written by G. Cianfrone and published by . This book was released on 1986 with total page 176 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 Temporal Masking Curves and Distortion Product Otoacoustic Emissions written by Erica J. Williams and published by . This book was released on 2003 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Comparison Between Contralateral Suppression in Cochlear Microphonics and Distortion Product Otoacoustic Emissions written by Fadi Jamil Najem and published by . This book was released on 2011 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present study examined and compared the effect of the contralateral stimulation of the auditory efferent system on the cochlear microphonics (CM) versus the distortion product otoacoustic emissions (DPOAEs). The DPOAEs and the CM were recorded from the right ear of 16 normal-hearing young female adults with and without 60 dB sound-pressure-level (SPL) broad band noise (BBN) in the left ear. DPOAEs were obtained at 0.5, 2, and 4 kHz, with L1 = 65 dB SPL and L2 = 50 dB SPL, and f2/f1 ratio = 1.2. The CM was recorded from the right tympanic membrane at 90 dB SPL using three stimuli (click and 0.5 and 2 kHz tone bursts) and two polarities (condensation and rarefaction). Results showed both suppression and enhancement of the DPOAE and the CM responses in the presence of BBN, but the effect was not statistically significant at any of the tested conditions. When the ratio of the suppression or enhancement was used, the effect was marginal for the 2 kHz TB stimulus of the CM. Results also showed a possible relation between the stimulus polarity and the type of effect on the CM. In conclusion, there is some evidence that the efferent system is involved in the suppression and enhancement of the CM, mainly at 2 kHz TB. This might be due to the nature of the CM recording from the basal turn of the cochlea. This study provided the first descriptions of the contralateral suppression of CM in humans. More research is needed to enhance the sensitivity of the CM test methodology to examine the function of the efferent system clinically.