Simultaneous suppression of tone burst-evoked otoacoustic emissions - effect of level and presentation paradigm
Killan, E.C. and Kapadia, S. (2006) Simultaneous suppression of tone burst-evoked otoacoustic emissions - effect of level and presentation paradigm. Hearing Research, 212, (1-2), 65-73. (doi:10.1016/j.heares.2005.10.010).
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There is conflict in the literature over whether individual frequency components of a transient-evoked otoacoustic emission (TEOAE) are generated within relatively independent “channels” along the basilar membrane (BM), or whether each component may be generated by widespread areas of the BM. Two previous studies on TEOAE suppression are consistent with generation within largely independent channels, but with a degree of interaction between nearby channels. However, both these studies reported significant suppression only at high stimulus levels, at which the “nonlinear” presentation paradigm was used. The present study clarifies the separate influences of stimulus level and presentation paradigm on this type of suppression. TEOAEs were recorded using stimulus tone bursts at 1, 2 and 3 kHz and a complex stimulus consisting of a digital addition of the three tone bursts, over a range of stimulus levels and both “linear” and “nonlinear” presentation paradigms. Responses to the individual tone bursts were combined offline and compared with responses to the complex stimuli. Results clearly demonstrate that TEOAE suppression under these conditions is dependent upon stimulus level, and not upon presentation paradigm. It is further argued that the data support the “local” rather than “widespread” model of TEOAE generation, subject to nonlinear interactions between nearby generation channels.
Abbreviations: BM, basilar membrane; OAE, otoacoustic emission; TEOAE, Transient-evoked otoacoustic emissions; I–O, Input–output; 2TS two-tone suppression.
|Keywords:||transient-evoked otoacoustic emissions, suppression, tone bursts|
|Subjects:||T Technology > TA Engineering (General). Civil engineering (General)
R Medicine > RA Public aspects of medicine
|Divisions:||University Structure - Pre August 2011 > Institute of Sound and Vibration Research > Human Sciences
|Date Deposited:||28 Apr 2006|
|Last Modified:||27 Mar 2014 18:16|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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