Temporal suppression and augmentation of click-evoked otoacoustic emissions

Sarah Verhulst, James Harte, Torsten Dau

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsResearchpeer-review

1466 Downloads (Pure)

Abstract

This study investigates and models temporal suppression of click-evoked otoacoustic emissions (CEOAEs). This suppression-effect is created when a suppressor-click is presented close in time to a test-click. The analysis was carried out for short time-frames of short- and long-latency CEOAEs. The latter is defined as a CEOAE with duration greater than 20 ms, typically observed for test subjects with spontaneous otoacoustic emissions (SOAEs). Previous studies have tended to exclude these test subjects but they are incorporated here. The results from six exemplary subjects demonstrate that temporal suppression is present in all CEOAEs for inter-click intervals (ICIs) less than 8 ms. The long-latency CEOAEs showed augmentation (i.e., negative suppression) for ICIs of 6-7 ms which was not reported for the short-latency CEOAE at these ICIs. A phenomenological approach is adopted here to explain both temporal suppression and augmentation of CEOAEs. Recently, a feedback automatic gain control (AGC) system has been used to model CEOAE suppression. However, this system cannot account for augmentation and therefore another, dynamic nonlinear model was developed. Suppression and augmentation were modeled phenomenologically using compression or expansion of the system output. This was obtained by shifting the operating-point on the input-output-characteristic in relation to the ICI.
Original languageEnglish
Title of host publicationJournal of Acoustical Society of America
Number of pages3854
Volume123
PublisherAcoustical Society of America
Publication date2008
DOIs
Publication statusPublished - 2008
EventAcoustics'08 - Paris, France
Duration: 29 Jun 20084 Jul 2008
http://webistem.com/acoustics2008/acoustics2008/cd1/data/index.html

Conference

ConferenceAcoustics'08
CountryFrance
CityParis
Period29/06/200804/07/2008
Internet address

Bibliographical note

Copyright (2008) Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America.

Fingerprint Dive into the research topics of 'Temporal suppression and augmentation of click-evoked otoacoustic emissions'. Together they form a unique fingerprint.

Cite this