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. ISSN 0742-3152.

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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, Engineering and Medicine > Engineering > 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
Official Date:	2009
Dates:	Date Event 2009 Published
Page Range:	pp. 118-119
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access (Creative Commons)
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

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