Verhulst, Sarah, Harte, James M. and Dau, Torsten (2009) Temporal adaptation in click-evoked otoacoustic emissions. In: 32nd Annual Midwinter Research Meeting of the Association for Research in Otolaryngology, Baltimore, ML, U.S.A., Feb 14-19, 2009. Published in: Abstracts of the 32nd Annual Midwinter Research Meeting of the Association for Research in Otolaryngology pp. 118-119.

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Abstract

The level of a click-evoked otoacoustic emission (CEOAE) is determined by the point on the internal CEOAE levelcurve set by the evoking click. For clicks below 30-40 dB, the CEOAE-level grows linearly while it saturates for higher input-levels. This study investigates how the CEOAE level-curve changes with the time between two click-presentations. It was found that when the time between two clicks was less than 10 ms, the two clicks operated from different CEOAE level-curves. This effect is referred to as temporal adaptation of the CEOAE level-curve and results in CEOAE-levels that are different even though the clicks have the same input-level. Temporal adaptation in CEOAEs was investigated by means of temporal suppression, which is the level variation that occurs when presenting a so-called suppressor-click close in time to a test-click. Temporal suppression consists of a phase- and magnitude component, and it is the magnitude-component only that can be used to quantify the CEOAE-level curve. Unlike historical studies, the phase-component was removed from the temporal suppression measure to quantify temporal adaptation of the CEOAE. The results for four subjects showed that the compression threshold of the CEOAE level-curve, i.e. the knee-point between linearity and compression, changed as a function of the time between suppressor- and test-click. The compression-threshold decreased (reflecting positive suppression) or increased (reflecting negative suppression) depending on the subject and the exact point.

Item Type:	Conference Item (Paper)
Subjects:	R Medicine > RF Otorhinolaryngology T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Journal or Publication Title:	Abstracts of the 32nd Annual Midwinter Research Meeting of the Association for Research in Otolaryngology
Publisher:	Association of Research into Otolaryngology
ISSN:	0742-3152
Date:	2009
Page Range:	pp. 118-119
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access
Description:	Abstract no. 348.
Conference Paper Type:	Paper
Title of Event:	32nd Annual Midwinter Research Meeting of the Association for Research in Otolaryngology
Type of Event:	Other
Location of Event:	Baltimore, ML, U.S.A.
Date(s) of Event:	Feb 14-19, 2009
URI:	http://wrap.warwick.ac.uk/id/eprint/47076

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