Analysis of Distortion Product Otoacoustic Emission Spectra in Normal-Hearing Adults Purpose To evaluate the ability of distortion product otoacoustic emission (DPOAE) spectral characteristics to distinguish between ears with variable hearing sensitivity within the normal range. Method Distortion product grams (DP-grams) were acquired with primary tones decremented in 1/8-octave steps and primary-tone levels presented at 65 dB SPL (L1) ... Research Article
Research Article  |   June 01, 2009
Analysis of Distortion Product Otoacoustic Emission Spectra in Normal-Hearing Adults
 
Author Affiliations & Notes
  • Shaum Bhagat
    The University of Memphis, Memphis, TN
  • Contact author: Shaum Bhagat, The University of Memphis - School of Audiology and Speech-Language Pathology, 807 Jefferson Avenue, Memphis, TN 38015. E-mail: sbhagat@memphis.edu.
Article Information
Hearing & Speech Perception / Hearing Disorders / Research and Technology / Research Articles
Research Article   |   June 01, 2009
Analysis of Distortion Product Otoacoustic Emission Spectra in Normal-Hearing Adults
American Journal of Audiology, June 2009, Vol. 18, 60-68. doi:10.1044/1059-0889(2009/08-0025)
History: Received August 15, 2008 , Accepted February 27, 2009
 
American Journal of Audiology, June 2009, Vol. 18, 60-68. doi:10.1044/1059-0889(2009/08-0025)
History: Received August 15, 2008; Accepted February 27, 2009
Web of Science® Times Cited: 1

Purpose To evaluate the ability of distortion product otoacoustic emission (DPOAE) spectral characteristics to distinguish between ears with variable hearing sensitivity within the normal range.

Method Distortion product grams (DP-grams) were acquired with primary tones decremented in 1/8-octave steps and primary-tone levels presented at 65 dB SPL (L1) and 45 dB SPL (L2) across an f2 frequency range of 842–7996 Hz from 22 normal-hearing adults (44 ears). Hearing thresholds of ears classified in Group A (n = 22) were better than ears classified in Group B (n = 22). Examined parameters of the DP-grams included spectral peak occurrence, peak height, peak width, and DPOAE levels. Analyses of variance were conducted to determine whether DP-gram parameters differed between Group A and Group B.

Results For the low-resolution DP-grams examined in this study, no significant between-group differences in peak occurrence, peak height, and peak width were observed. DPOAE levels were significantly higher in ears classified in Group A compared with ears classified in Group B in individuals with symmetrical hearing.

Conclusions Although spectral peaks are evident in DP-grams acquired with low resolution of the primary tones, DPOAE levels are more effective in distinguishing ears with greater hearing sensitivity from less sensitive ears.

Acknowledgments
The author wishes to thank Cara Donahue for her contributions to this project. Portions of this report were presented at Audiology NOW! 2008, held in Charlotte, NC.
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