Investigation of the correlation between distortion product and transient evoked otoacoustic emissions in the human and the chinchilla
Keywords:Acoustic distortion, Acoustic emissions, Living systems studies, Physiological models, Chinchinilla, Distortion product otoacoustic emission (DPOAE), Transient evoked otoacoustic emission (TEOAE)
AbstractOtoacoustic emission recordings are being used as a clinical tool in detecting cochlear hearing loss. Whilst transient evoked otoacoustic emissions (TEOAEs) possess high sensitivity, their frequency specificity has been questioned. For more reliable information about threshold changes at specific frequencies, distortion product otoacoustic emissions (DPOAEs) are being used. It is the aim of this study to investigate the correlation between these two types of evoked OAEs. The study is comprised of two parts. The first part involves measurements of DPOAE and TEOAE amplitudes in eighteen ears of nine normally-hearing humans, in the 1 to 5 kHz range. The second part of the study employs a similar protocol with recordings made from 18 normally-hearing chinchilla ears. In the first investigation, human DPOAE responses are plotted against the corresponding TEOAE responses across a whole frequency range (1-5 kHz). The chinchilla data are similarly analyzed and the results from both investigations suggest some correlation between DPOAE and TEOAE amplitudes in the 1-5 kHz frequency region.
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