Download or read book Real Time Measurement of Distortion Product Otoacoustic Emissions in the Assessment of the Olivocochlear Contralateral Reflex written by Adrian Lewis James and published by . This book was released on 2006 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Real Time Measurement of Distortion Product Otoacoustic Emmissions in the Assessment of the Olivocochlear Contralateral Reflex written by Adrian James and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hearing Loss written by Sadaf Naz and published by BoD – Books on Demand. This book was released on 2012-03-28 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: Authored by 17 international researchers and research teams, the book provides up-to-date insights on topics in five different research areas related to normal hearing and deafness. Techniques for assessment of hearing and the appropriateness of the Mongolian gerbil as a model for age-dependent hearing loss in humans are presented. Parental attitudes to childhood deafness and role of early intervention for better treatment of hearing loss are also discussed. Comprehensive details are provided on the role of different environmental insults including injuries in causing deafness. Additionally, many genes involved in hearing loss are reviewed and the genetics of recessively inherited moderate to severe and progressive deafness is covered for the first time. The book also details established and evolving therapies for treatment of deafness.
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 Archives of Acoustics Quarterly written by and published by . This book was released on 2018 with total page 772 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Establishing the Test Retest Reliability of Contralateral Auditory Suppression of Transient Evoked Otoacoustic Emissions in a Cohort of Healthy Individuals written by Indika Pradeepa Kumari Gunasena Mahawattage and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In clinical practice, Transient Evoked Otoacoustic Emissions (TEOAE) are used to assess hearing impairments in several cohorts. The TEOAE can be evoked in healthy cochlea by presenting a brief auditory stimulus in the form of a series of clicks. Similarly, TEOAE signals can be suppressed in the ipsilateral ear by presenting an alternative sound to the contralateral ear through stimulation of either the medial olivo-cochlear (MOC) reflex or acoustic reflex (AR). The suppression effect results from either due to attenuation of the otoacoustic emissions generation through the activation of MOC reflex or due to the obliteration of their transmission by the activation of middle ear muscle reflex (acoustic reflex). In individuals that suffer from brain injury, such as a concussion, the neuronal pathways that enable CASTEOAE may be disturbed which in turn will restrict the ability to generate TEOAEs and to invoke the contralateral suppression effect. Moreover, since a person performing the test cannot manipulate TEOAE signals, the technique could provide an objective measure of concussion status and severity. The following study was designed to measure the test-retest reliability of the CASTEOAE as a first step in establishing the CASTEOAE phenomenon as an evaluation tool for concussion assessment. A convenience sample of 30 healthy individuals, 16-50 years of age completed the CASTEOAE test on two separate occasions, using a 14-day between test interval. The MOC reflex was activated using broadband noise of 60 dB SPL while the Acoustic Reflex was elicited by presenting a broadband noise of 80 dB SPL to the contralateral ear. The OAE amplitudes were recorded across 5 half octave bands in each ear. The test-retest reliability was estimated with the intraclass correlation coefficient procedure using a one-way random effects model for n=30, k (trials)=2. Confidence intervals for the Intraclass Correlation Coefficients (ICCs) and measures of homogeneity of variance were also calculated for each condition. The reliability estimates for CASTEOAE test scores were calculated for TEOAE scores with and without contralateral suppression (Primary measures) of the MOC reflex and separately for the acoustic reflex. The ICCs of the total OAE responses for both MOC reflex and acoustic reflex demonstrated as high as 0.9 in both ears and the ICCs of the fractional octave band for the MOC reflex ranged from 0.6 (left ear @1000 Hz) to 0.95 (right ear @ 4000 Hz), and 0.75 (left ear @1000 Hz) to 0.97 (right ear @ 4000 Hz) for the AR. This data suggests that the MOC and AR reflexes were each significantly repeatable upon test and retest in the sample. In addition, CASTEOAE suppression of the acoustic reflex was greater than MOC reflex suppression; and each participant showed unique TEOAE distribution pattern across the 5 half octave frequency bands, which were consistent over time. The results support the use of the CASTEOAE test as a reliable non-invasive approach to evaluate the functional status of the auditory efferent system and its neural connections with the rest of the brain and the use of this stable and objective measure as a clinical tool to assess a concussion injury.
Download or read book Pre clinical Testing of Real time Distortion Product Otoacoustic Emission Devices written by Victoria Wai-Chi Young and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Distortion product otoacoustic emission (DPOAE) testing is a relatively quick, non-invasive, low-cost, and accurate method for assessing cochlear function in infants and young children. The use of current DPOAE devices, that process data through FFT and data-averaging techniques, are limited, in part, due to high ambient noise susceptibility, which lengthens testing time. A DPOAE device that acquires and processes DPOAE signals in real-time, through digital signal filtering, and is less susceptible to ambient noise was developed at the University of Toronto. Pilot studies on adult and child subjects conducted with real-time DPOAE devices at the Hospital for Sick Children indicate that overall testing times are faster for the real-time devices and the test results are comparable to the results from current data-averaging devices. The conclusion is that the real-time DPOAE devices are capable of reliably and accurately diagnosing cochlear function and is less susceptible to noise than data-averaging DPOAE devices.
Download or read book ESTABLISHING THE TEST RETEST RELIABILITY OF CONTRALATERAL AUDITORY SUPPRESSION OF TRANSIENT EVOKED OTO ACOUSTIC EMISSIONS IN A COHORT OF NORMAL HEALTHY INDIVIDUALS FOR THE PURPOSE OF DEVELOPING AN EVALUATION TOOL FOR CONCUSSION written by Indika Mahawattage and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In clinical practice, transient evoked otoacoustic emissions (TEOAE) are used to assess hearing impairments in several cohorts. The TEOAE can be evoked in healthy cochlea by presenting a brief auditory stimulus in the form of a series of clicks. Similarly, TEOAE signals can be suppressed in the ipsilateral ear by presenting an alternative sound to the contralateral ear through stimulation of either the medial olivo-cochlear (MOC) reflex or acoustic reflex (AR). The suppression effect results from either due to attenuation of the otoacoustic emissions generation by the cochlear outer hair cells through the activation of MOC reflex or due to the obliteration of their transmission by the activation of middle ear muscle reflex (Acoustic Reflex). In individuals that suffer a brain injury, such as a concussion, the neuronal pathways that enable CASTEOAE may be disturbed which in turn will restrict the ability to invoke the contralateral suppression effect. Moreover, since a person performing the test cannot manipulate TEOAE signals, the technique could provide an objective measure of concussion status and severity.The following study was designed to measure the test-retest reliability of the CASTEOAE as a first step in establishing the CASTEOAE phenomenon as an evaluation tool for concussion assessment. A convenience sample of 30 healthy individuals, 16-50 years of age completed the CASTEOAE test on two separate occasions, using a 14-day between test interval. The MOC reflex was activated using broadband noise of 60 dB SPL while the Acoustic Reflex was elicited by presenting a broadband noise of 80 dB SPL to the contralateral ear. The OAE amplitudes were recorded across 5 half octave bands in each ear. Test-retest reliability was estimated with the intraclass correlation coefficient procedure using a one-way random effects model for n=30, k (trials)=2. Confidence intervals for the intraclass correlation coefficients (ICCs) and measures of homogeneity of variance were also calculated for each condition. Reliability estimates for CASTEOAE test scores were calculated for the TEOAE scores with and without contralateral suppression (Primary measures) of the MOC reflex and separately for the Acoustic Reflex. ICCs of the Total OAE responses for both MOC reflex and Acoustic reflex demonstrated as high as 0.9 in both ears and the ICCs of the fractional octave band for the MOC reflex ranged from 0.6 (left ear @1000 Hz) to 0.95 (right ear @ 4000 Hz), and 0.75 (left ear @1000 Hz) to 0.97 (right ear @ 4000 Hz) for the AR. These data suggest that the MOC and AR reflexes were each significantly repeatable upon test and retest in the sample. In addition, CASTEOAE test suppression of the acoustic reflex was greater than MOC reflex suppression; and each participant showed unique TEOAE distribution patterns across the 5 frequency half octave bands, which were consistent over time. The results support the use of the CASTEOAE test as a reliable non-invasive approach to evaluate the functional status of the auditory efferent system and its neural connections with the rest of the brain and the use of this stable and objective measure as a clinical tool to assess a concussion injury.
Download or read book The Specificity of the Midial Olivocochlear Effect on Frequency and Word Discrimination in Noise written by David Glen Price and published by . This book was released on 2013 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ipsilateral or contralateral activation of the MOC pathway is known to result in modifications of OHC mobility. These changes impact on the cochlear active process and the ability to detect low intensity sound and can be observed through OAE measurements. Previous studies have shown that the presence of this effect in situations where sound is masked by noise can result in an improvement of discriminatory ability. The tonotopical nature of the MOC has been observed anatomically, but its physiological relevance remains uncertain. This thesis aimed to investigate the possible changes in MOC effect when contralaterally activated by noise of varying frequency spectrum. It was hypothesised that when attempting to distinguish tonal patterns of 4 or 5 kHz presented in a BBN, participants would perform better when contralaterally stimulated with noise that contained the same frequency range. Using DPOAE measurements in the presence of contralateral noise, it was also hypothesised that suppression of emissions caused by OHC modification could be used as relative measures of MOC strength. These measures were then referenced against performance in psychoacoustic discrimination tasks looking at the effect of varying frequency contralateral stimulation on word and frequency pattern discrimination. Results showed a significant relationship between the presence of contralateral noise and discrimination ability in the psychoacoustic tests. However, no change in DPOAE suppression was observed when tested in the presence of different contralateral stimulation (F (30, 600) = 0.742, p=0.840). No significant interaction was found between DPOAE measurements and psychoacoustic results. Despite steps to remove its influence, activation of the acoustic reflex was statistically significant in several findings which complicated the interpretation of the study's results. The benefit observed with contralateral stimulation in psychoacoustic testing suggested the presence and activation of the MOC pathway, despite the inability of DPOAE findings to confirm its suppression of the cochlear active process. The proportional benefit of using frequency relevant noise as an activator of contralateral MOC effect were potentially observed but unable to be confirmed by physiological data.
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 The Mechanics and Biophysics of Hearing written by Peter Dallos and published by Springer. This book was released on 2014-03-11 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of a workshop on the physics and biophysics of hearing that brought together experimenters and modelers working on all aspects of audition. Topics covered include: cochlear mechanical measurements, cochlear models, mechanicals and biophysics of hair cells, efferent control, and ultrastructure.
Download or read book Basic Aspects of Hearing written by Brian C.J. Moore and published by Springer Science & Business Media. This book was released on 2013-05-29 with total page 545 pages. Available in PDF, EPUB and Kindle. Book excerpt: The International Symposium on Hearing is a highly-prestigious, triennial event where world-class scientists present and discuss the most recent advances in the field of hearing research in animals and humans. Presented papers range from basic to applied research, and are of interest neuroscientists, otolaryngologists, psychologists, and artificial intelligence researchers. Basic Aspects of Hearing: Physiology and Perception includes the best papers from the 2012 International Symposium on Hearing. Over 50 chapters focus on the relationship between auditory physiology, psychoacoustics, and computational modeling.
Download or read book Cumulated Index Medicus written by and published by . This book was released on 1989 with total page 1470 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Auditory Efferent System New Insights from Cortex to Cochlea written by Paul H. Delano and published by Frontiers Media SA. This book was released on 2016-09-06 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main function of the sensory systems is the transducing of external stimuli into bioelectrical signals, which are conducted through afferent pathways from sensory epithelia to the brain. However, it is known that descending projections are ubiquitous in the different sensory modalities, and in the case of auditory efferents connect the cerebral cortex with sensory receptor cells. Several functions have been attributed to the efferent system, including protection to acoustic trauma, unmasking of auditory stimuli in background noise, balance of interaural sensitivity and some cognitive functions like modulation of cochlear sensitivity during selective attention to auditory or visual stimuli. In addition there is evidence of a possible involvement of the efferent system in the etiology or treatment of some clinical pathologies like tinnitus. In this e-book, entitled “Auditory Efferent System: New Insights from Cortex to Cochlea”, we aimed to give an overview of the advances concerning the descending projections from the auditory cortex to subcortical nuclei and the olivocochlear system. In addition, different theoretical proposals of efferent functions are presented. We think that this e-book is an important contribution to the understanding of the efferent system in mammals, merging auditory-cortex literature with studies performed in the olivocochlear system.
Download or read book Hearing written by Stanley A. Gelfand and published by CRC Press. This book was released on 2004-09-28 with total page 513 pages. Available in PDF, EPUB and Kindle. Book excerpt: Brimming with more than more than 1700 references, this reader-friendly and extensively revised Fourth Edition will prove invaluable to instructors and students alike-providing a unified approach to the anatomical, physiological, and perceptual aspects of audition with updated chapters on the latest developments in the field.
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 Noise induced Hearing Loss written by Armand L. Dancer and published by . This book was released on 1992 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:
