Comparing behavioral and otoacoustic emission fine structures

James B. Dewey, Sumitrajit Dhar

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

2 Citations (Scopus)

Abstract

Behavioral and otoacoustic emission (OAE)-based measures of cochlear function often exhibit "fine structure," quasiperiodic fluctuations in magnitude (and/or phase) as a function of frequency. For pure-tone detection thresholds and OAE responses to low-level clicks or tones, in particular, this fine structure is thought to arise via multiple intracochlear reflections of the stimulus-evoked OAE between its site of origin and the middle ear boundary. Cochlear resonances occur at frequencies for which the reflections sum in phase, thus enhancing behavioral sensitivity and OAE responses. Here we explore predictions of this theoretical framework via detailed measurements of behavioral thresholds and OAEs evoked by single tones, i.e., stimulus-frequency OAEs (SFOAEs). Consistent with the cochlear resonance framework, we find that the fine structure observed in hearing thresholds is nearly identical to the fine structure of both SFOAE amplitudes and delays. In addition, the frequency separation between adjacent threshold minima is associated with one cycle of SFOAE phase accumulation. However, the relationship between SFOAE amplitude and fine structure magnitude is less clear, perhaps due to variability in the strength of the reflection mechanism at the middle ear boundary.

Original languageEnglish
Title of host publicationFA 2014
Subtitle of host publication7th Forum Acusticum
Place of PublicationMadrid, Spain
PublisherEuropean Acoustics Association, EAA
Volume2014-January
ISBN (Electronic)9788361402282
Publication statusPublished - 2014
Externally publishedYes
Event7th Forum Acusticum, FA 2014 - Krakow, Poland
Duration: 7 Sep 201412 Sep 2014

Other

Other7th Forum Acusticum, FA 2014
CountryPoland
CityKrakow
Period7/09/1412/09/14

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  • Cite this

    Dewey, J. B., & Dhar, S. (2014). Comparing behavioral and otoacoustic emission fine structures. In FA 2014: 7th Forum Acusticum (Vol. 2014-January). Madrid, Spain: European Acoustics Association, EAA.