An otoacoustic emission (OAE) is a
sound which is generated from within the
inner ear. Having been predicted by
Thomas Gold in
1948, their existence was first demonstrated experimentally by David Kemp in
1978 and they have since been shown to arise by a number of different cellular mechanisms within the
inner ear. Numerous studies have shown that OAEs disappear after the inner ear has been damaged, so OAEs are often used in the laboratory and the clinic as a measure of inner ear health. Broadly speaking, there are two types of otoacoustic emissions: Spontaneous Otoacoustic Emissions (SOAEs) and Evoked Otoacoustic Emissions (EOAEs). As their names suggest, SOAEs arise spontaneously and EOAEs require an evoking
stimulus.
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