Pressurized transient otoacoustic emissions measured using click and chirp stimuli

Douglas H Keefe, M. Patrick Feeney, Lisa L. Hunter, Denis F. Fitzpatrick, Chris A. Sanford

Research output: Contribution to journalArticle

Abstract

Transient-evoked otoacoustic emission (TEOAE) responses were measured in normal-hearing adult ears over frequencies from 0.7 to 8 kHz, and analyzed with reflectance/admittance data to measure absorbed sound power and the tympanometric peak pressure (TPP). The mean TPP was close to ambient. TEOAEs were measured in the ear canal at ambient pressure, TPP, and fixed air pressures from 150 to -200 daPa. Both click and chirp stimuli were used to elicit TEOAEs, in which the incident sound pressure level was constant across frequency. TEOAE levels were similar at ambient and TPP, and for frequencies from 0.7 to 2.8 kHz decreased with increasing positive and negative pressures. At 4-8 kHz, TEOAE levels were larger at positive pressures. This asymmetry is possibly related to changes in mechanical transmission through the ossicular chain. The mean TEOAE group delay did not change with pressure, although small changes were observed in the mean instantaneous frequency and group spread. Chirp TEOAEs measured in an adult ear with Eustachian tube dysfunction and TPP of -165 daPa were more robust at TPP than at ambient. Overall, results demonstrate the feasibility and clinical potential of measuring TEOAEs at fixed pressures in the ear canal, which provide additional information relative to TEOAEs measured at ambient pressure.

Original languageEnglish (US)
Pages (from-to)399-417
Number of pages19
JournalJournal of the Acoustical Society of America
Volume143
Issue number1
DOIs
StatePublished - Jan 1 2018
Externally publishedYes

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chirp
stimuli
ear
canals
eustachian tubes
Stimulus
hearing
sound pressure
electrical impedance
asymmetry
reflectance

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

Cite this

Pressurized transient otoacoustic emissions measured using click and chirp stimuli. / Keefe, Douglas H; Patrick Feeney, M.; Hunter, Lisa L.; Fitzpatrick, Denis F.; Sanford, Chris A.

In: Journal of the Acoustical Society of America, Vol. 143, No. 1, 01.01.2018, p. 399-417.

Research output: Contribution to journalArticle

Keefe, Douglas H ; Patrick Feeney, M. ; Hunter, Lisa L. ; Fitzpatrick, Denis F. ; Sanford, Chris A. / Pressurized transient otoacoustic emissions measured using click and chirp stimuli. In: Journal of the Acoustical Society of America. 2018 ; Vol. 143, No. 1. pp. 399-417.
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