Journal article
Influence of in situ, sound-level calibration on distortion-product otoacoustic emission variability
The Journal of the Acoustical Society of America, Vol.124(1), pp.288-300
07/01/2008
DOI: 10.1121/1.2931953
PMID: 18646977
Abstract
Standing waves can cause errors during in-the-ear calibration of sound pressure level (SPL), affecting both stimulus magnitude and distortion-product otoacoustic emission (DPOAE) level. Sound intensity level (SIL) and forward pressure level (FPL) are two measurements theoretically unaffected by standing waves. SPL, SIL, and FPL in situ calibrations were compared by determining sensitivity of DPOAE level to probe-insertion depth (deep and "shallow") for a range of stimulus frequencies (1-8 kHz) and levels (20-60 dB). Probe-insertion depth was manipulated with the intent to shift the frequencies with standing-wave minima at the emission probe, introducing variability during SPL calibration. The absolute difference in DPOAE level between insertions was evaluated after correcting for an incidental change caused by the effect of ear-canal impedance on the emission traveling from the cochlea. A three-way analysis of variance found significant main effects for stimulus level, stimulus frequency, and calibration method, as well as significant interactions involving calibration method. All calibration methods exhibited changes in DPOAE level due to the insertion depth, especially above 4 kHz. However, SPL demonstrated the greatest changes across all stimulus levels for frequencies above 2 kHz, suggesting that SIL and FPL provide more consistent measurements of DPOAEs for frequencies susceptible to standing-wave calibration errors. (c) 2008 Acoustical Society of America.
Details
- Title: Subtitle
- Influence of in situ, sound-level calibration on distortion-product otoacoustic emission variability
- Creators
- Rachel A. Scheperle - Boys Town National Research HospitalStephen T. Neely - Communications Technology LaboratoryJudy G. Kopun - Boys Town National Research HospitalMichael P. Gorga - Boys Town National Research Hospital
- Resource Type
- Journal article
- Publication Details
- The Journal of the Acoustical Society of America, Vol.124(1), pp.288-300
- DOI
- 10.1121/1.2931953
- PMID
- 18646977
- NLM abbreviation
- J Acoust Soc Am
- ISSN
- 0001-4966
- eISSN
- 1520-8524
- Publisher
- Acoustical Soc Amer Amer Inst Physics
- Number of pages
- 13
- Grant note
- T35DC008757 / NATIONAL INSTITUTE ON DEAFNESS AND OTHER COMMUNICATION DISORDERS; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA; NIH National Institute on Deafness & Other Communication Disorders (NIDCD) R01 DC008318-02; R01 DC8318; R01 DC2251; R01 DC002251-14; T35 DC8757-01; R01 DC008318; P30 DC004662; P30 DC004662-029003; R01 DC002251; P30 DC4662; T35 DC008757-02; P30 DC004662-079002; T35 DC008757 / NIDCD NIH HHS; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA; NIH National Institute on Deafness & Other Communication Disorders (NIDCD)
- Language
- English
- Date published
- 07/01/2008
- Academic Unit
- Otolaryngology
- Record Identifier
- 9985219296002771
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