Temporal Resolution With a Prescriptive Fitting Formula Purpose Authors of previous work using laboratory-based paradigms documented that wide dynamic range compression (WDRC) may improve gap detection compared to linear amplification. The purpose of this study was to measure temporal resolution using WDRC fit with compression ratios set for each listener's hearing loss. Method Nineteen adults ... Research Article
Research Article  |   December 01, 2013
Temporal Resolution With a Prescriptive Fitting Formula
 
Author Affiliations & Notes
  • Marc A. Brennan
    University of Washington, Seattle
  • Frederick J. Gallun
    National Center for Rehabilitative Auditory Research, Portland VA Medical Center, Portland, OR
  • Pamela E. Souza
    Northwestern University, Evanston, IL
  • G. Christopher Stecker
    University of Washington, Seattle
  • Disclosure: The authors have declared that no competing interests existed at the time of publication.
    Disclosure: The authors have declared that no competing interests existed at the time of publication.×
  • Correspondence to Marc A. Brennan: Marc.Brennan@boystown.org
  • Editor: Larry Humes
    Editor: Larry Humes×
Article Information
Hearing & Speech Perception / Acoustics / Hearing Disorders / Hearing Aids, Cochlear Implants & Assistive Technology / Research Articles
Research Article   |   December 01, 2013
Temporal Resolution With a Prescriptive Fitting Formula
American Journal of Audiology, December 2013, Vol. 22, 216-225. doi:10.1044/1059-0889(2013/13-0001)
History: Received January 3, 2013 , Revised February 14, 2013 , Accepted March 5, 2013
 
American Journal of Audiology, December 2013, Vol. 22, 216-225. doi:10.1044/1059-0889(2013/13-0001)
History: Received January 3, 2013; Revised February 14, 2013; Accepted March 5, 2013
Web of Science® Times Cited: 3

Purpose Authors of previous work using laboratory-based paradigms documented that wide dynamic range compression (WDRC) may improve gap detection compared to linear amplification. The purpose of this study was to measure temporal resolution using WDRC fit with compression ratios set for each listener's hearing loss.

Method Nineteen adults with mild-to-moderate hearing loss fitted with WDRC or linear amplification set to a prescriptive fitting method participated in this study. Subjects detected amplitude modulations and gaps. Two types of noise carrier were used: narrowband (1995–2005 Hz) and broadband (100–8000 Hz).

Results Small differences between WDRC and linear amplification were observed in the measures of temporal resolution. Modulation detection thresholds worsened by a mean of 0.7 dB with WDRC compared to linear amplification. This reduction was observed for both carrier types. Gap detection thresholds did not differ between the 2 amplification conditions.

Conclusions WDRC set using a prescriptive fitting method with individualized compression ratios had a small but statistically significant effect on measures of modulation thresholds. Differences were not observed between the two amplification conditions for the measures of gap detection. These findings contrast with previous work using fixed compression ratios, suggesting that the effect of the fitting method on the compression ratio should be considered when attempting to generalize the effect of WDRC on temporal resolution to the clinical setting.

Acknowledgments
The authors wish to thank Ryan McCreery for assistance with the statistical analysis. This work was supported by National Institutes of Health Grants F31 DC010978-01, P30 DC 04661, T32 DC000033, R01 DC011548, R01 DC006014, I01 RX000536, and VA-RR&D CD2 C4963W. A portion of these data were presented at the 2010 American Auditory Society Annual Meeting and at the 2010 International Hearing Aid Research Conference.
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