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

By Geoffrey A. Manley, Richard R. Fay

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

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Extra info for Active Processes and Otoacoustic Emissions in Hearing

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After Elliot 1958; Kemp and Martin 1976) (c) Data on inter-loudness-peak intervals across frequency from four subjects showing a high degree of uniformity and roughly following the contour of the auditory filter bandwidth (after Thomas 1975). This is evidence for a cochlear origin of OAE. The rough regularity of loudness enhancements suggested a standing wave/reflection explanation. (d) The key evidence for the physical nature of the auditory microstructure and a standing wave origin. Left side: Loudness enhancement peaks shift to slightly higher frequencies when the ear drum is made more stiff with either positive or negative air pressure.

From this whole series of experiments, the cochlear “echo” experiment was selected for first publication, as the logic was the easiest to describe. Convincing reviewers that there was a previously unknown acoustic “auditory response” seemed to be less of a challenge than trying to convince them that an obscure “modulation” of middle ear impedance was unambiguous evidence of a new biological process! The paper was submitted for publication in the Journal of the Acoustical Society of America (Kemp 1978).

C) Bottom right: The rate of suppression at the 50 % suppression point expressed as dB OAE 1. Otoacoustic Emissions 23 the ear canal microphone this time to a clinical auditory evoked-response averaging system and synchronizing the averager to a repeated acoustic click stimulus, the sound level in the ear canal was repeatedly recorded for 31 ms after each stimulus. The expectation was to see multiple “echoes” of the applied click stimulus with an interecho interval of about 10 ms, as anticipated from the interfrequency peak interval of the auditory microstructure.

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