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Temporal adaptation in click-evoked otoacoustic emissions
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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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Official URL: http://www.aro.org/abstracts/09_Abstract_Book.pdf
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) | ||||
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Subjects: | R Medicine > RF Otorhinolaryngology T Technology > TA Engineering (General). Civil engineering (General) |
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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: |
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Page Range: | pp. 118-119 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Open Access (Creative Commons) | ||||
Description: | Abstract no. 348. |
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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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