Lecture 8 Slides

Lecture 8 Slides - Review Diagnostics I Diagnostics II...

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Review Diagnostics I z Screening vs. Evaluation: Determine possibility of hearing loss vs. nature and treatment of hearing loss. z Types of hearing loss: Conductive – outer/middle ear; Sensorineural – cochlea or beyond; Mixed – some of both z Diagnostics: Case history, otoscopic evaluation, tympanogram, audiogram, word recognition score z Air-Bone Gap: Difference between airborne and bone conduction thresholds. Presence of air-bone gap indicates a conductive loss. z Common causes of hearing loss: Conductive – otitis media, otosclerosis; Sensorineural: Meniere’s disease, presbycusis z Low level acoustic signals of cochlear origin that may be recorded in the closed ear canal. z First report: David Kemp (1978). Stimulated acoustic emissions from within the human auditory system. J Acoust Soc Am. 64:1386-1391. z Hearing Screening in newborns Diagnostics II Otoacoustic Emissions, OAE Path of OAE Source of OAE OHCs Rocking motion of OHCs causes basilar membrane to vibrate, produces sound that travels out the ear canal
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This note was uploaded on 03/21/2012 for the course COM DIS 110 taught by Professor Weismer during the Fall '08 term at Wisconsin.

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Lecture 8 Slides - Review Diagnostics I Diagnostics II...

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