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Download Active Processes and Otoacoustic Emissions in Hearing by Geoffrey A. Manley, Richard R. Fay PDF

By Geoffrey A. Manley, Richard R. Fay

The cochlea doesn't simply choose up sound, it additionally produces sounds of low depth referred to as Otoacoustic Emissions (OAEs). Sounds produced through fit ears – both spontaneously or in line with stimuli - permit researchers and clinicians to review listening to and cochlear functionality noninvasively in either animals and people. This booklet provides the 1st critical overview of the organic foundation of those otoacoustic emissions.

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Unfortunately, the profile of emitted distortion-product components (see Fig. 3) does not allow the unambiguous determination of hair cell operating characteristics, not least because the relative DP proportions are grossly affected by the emissions mechanism and the integration of multiple cellular sources. The situation will be further complicated if it becomes necessary to account for the nonlinear motility of both the hair cell body and the hair bundle (Fettiplace and Hackney 2006; see also Martin, Chapter 4).

Proc R Soc B135: 462–491. Kanis LJ, Boer E de (1997) Frequency dependence of acoustic distortion products in a locally active model of the cochlea. J Acoust Soc Am 101:1527–1531. Kashar B, Brownell WE, Altschuler R, Fex J (1986) Electrokinetic shape changes of cochlear outer hair cells. Nature 322:356–368. Kemp DT (1971) A new technique for the analysis of transient ELF electromagnetic disturbances within the Earth-ionosphere cavity. J Atmos Terr Pys 33:567–572. Kemp DT (1978) Stimulated acoustic emissions from within the human auditory system.

This concept was far too radical for most auditory researchers to accept at that time. Proof that sound emissions from the cochlea existed was just not sufficient to overturn decades of laboratory findings apparently supporting the von Békésy view. To be even tempted to embrace the opposite view would have been judged scientifically irresponsible by most leading figures at the time. , Evans and Wilson 1975). Several alternative explanations of OAEs were proposed that avoided an association between OAEs and basilar membrane characteristics.

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