Comparison of nine methods to estimate ear-canal stimulus levels

Natalie N. Souza, Sumitrajit Dhar, Stephen T Neely, Jonathan H. Siegel

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

The reliability of nine measures of the stimulus level in the human ear canal was compared by measuring the sensitivity of behavioral hearing thresholds to changes in the depth of insertion of an otoacoustic emission probe. Four measures were the ear-canal pressure, the eardrum pressure estimated from it and the pressure measured in an ear simulator with and without compensation for insertion depth. The remaining five quantities were derived from the ear-canal pressure and the Thévenin-equivalent source characteristics of the probe: Forward pressure, initial forward pressure, the pressure transmitted into the middle ear, eardrum sound pressure estimated by summing the magnitudes of the forward and reverse pressure (integrated pressure) and absorbed power. Two sets of behavioral thresholds were measured in 26 subjects from 0.125 to 20 kHz, with the probe inserted at relatively deep and shallow positions in the ear canal. The greatest dependence on insertion depth was for transmitted pressure and absorbed power. The measures with the least dependence on insertion depth throughout the frequency range (best performance) included the depth-compensated simulator, eardrum, forward, and integrated pressures. Among these, forward pressure is advantageous because it quantifies stimulus phase.

Original languageEnglish (US)
Pages (from-to)1768-1787
Number of pages20
JournalJournal of the Acoustical Society of America
Volume136
Issue number4
DOIs
StatePublished - Oct 1 2014

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canals
ear
stimuli
estimates
eardrums
insertion
simulators
Stimulus
Ear
Canals
probes
middle ear
thresholds
hearing
sound pressure
frequency ranges

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

Cite this

Comparison of nine methods to estimate ear-canal stimulus levels. / Souza, Natalie N.; Dhar, Sumitrajit; Neely, Stephen T; Siegel, Jonathan H.

In: Journal of the Acoustical Society of America, Vol. 136, No. 4, 01.10.2014, p. 1768-1787.

Research output: Contribution to journalArticle

Souza, Natalie N. ; Dhar, Sumitrajit ; Neely, Stephen T ; Siegel, Jonathan H. / Comparison of nine methods to estimate ear-canal stimulus levels. In: Journal of the Acoustical Society of America. 2014 ; Vol. 136, No. 4. pp. 1768-1787.
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