Bentsen, Thomas, Harte, James M. and Dau, Torsten. (2011) Human cochlear tuning estimates from stimulus-frequency otoacoustic emissions. The Journal of the Acoustical Society of America, Vol.129 (No.6). pp. 3797-3807. ISSN 0001-4966

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Abstract

Two objective measures of human cochlear tuning, using stimulus-frequency otoacoustic emissions (SFOAE), have been proposed. One measure used SFOAE phase-gradient delay and the other two-tone suppression (2TS) tuning curves. Here, it is hypothesized that the two measures lead to different frequency functions in the same listener. Two experiments were conducted in ten young adult normal-hearing listeners in three frequency bands (1-2 kHz, 3-4 kHz and 5-6 kHz). Experiment 1 recorded SFOAE latency as a function of stimulus frequency, and experiment 2 recorded 2TS iso-input tuning curves. In both cases, the output was converted into a sharpness-of-tuning factor based on the equivalent rectangular bandwidth. In both experiments, sharpness-of-tuning curves were shown to be frequency dependent, yielding sharper relative tuning with increasing frequency. Only a weak frequency dependence of the sharpness-of-tuning curves was observed for experiment 2, consistent with objective and behavioural estimates from the literature. Most importantly, the absolute difference between the two tuning estimates was very large and statistically significant. It is argued that the 2TS estimates of cochlear tuning likely represents the underlying properties of the suppression mechanism, and not necessarily cochlear tuning. Thus the phase-gradient delay estimate is the most likely one to reflect cochlear tuning.

Item Type:	Journal Article
Subjects:	Q Science > QP Physiology R Medicine > RF Otorhinolaryngology T Technology > TA Engineering (General). Civil engineering (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:	Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Journal or Publication Title:	The Journal of the Acoustical Society of America
Publisher:	Acoustical Society of America
ISSN:	0001-4966
Date:	June 2011
Volume:	Vol.129
Number:	No.6
Number of Pages:	11
Page Range:	pp. 3797-3807
Identification Number:	10.1121/1.3575596
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Version or Related Resource:	This item was also presented in a modified format at Forum Acusticum 2011, Aalborg, Denmark, Jun 27 - Jul 1, 2011.
URI:	http://wrap.warwick.ac.uk/id/eprint/47060

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