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Research Article
December 1992

Modulation Detection, Modulation Masking, and Speech Understanding in Noise in the Elderly

Publication: Journal of Speech, Language, and Hearing Research
Volume 35, Number 6
Pages 1410-1421

Abstract

Temporal processing of suprathreshold sounds was examined in a group of young normalhearing subjects (mean age of 26.0 years), and in three groups of older subjects (mean ages of 54.3, 64.8, and 72.2 years) with normal hearing or mild sensorineural hearing loss. Three experiments were performed. In the first experiment (modulation detection), subjects were asked to detect sinusoidal amplitude modulation (SAM) of a broadband noise, for modulation frequencies ranging from 2–1024 Hz. In the second experiment (modulation masking), the task was to detect a SAM signal (modulation frequency of 8 Hz) in the presence of a 100%-modulated SAM masker. Masker modulation frequency ranged from 2–64 Hz. In the final experiment, speech understanding was measured as a function of signal-to-noise ratio in both an unmodulated background noise and in a SAM background noise that had a modulation frequency of 8 Hz and a modulation depth of 100%. Except for a very modest correlation between age and modulation detection sensitivity at low modulation frequencies, there were no significant effects of age once the effect of hearing loss was taken into account. The results of the experiments suggest, however, that subjects with even a mild sensorineural hearing loss may have difficulty with a modulation masking task, and may not understand speech as well as normal-hearing subjects do in a modulated noise background.

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Information & Authors

Information

Published In

Journal of Speech, Language, and Hearing Research
Volume 35Number 6December 1992
Pages: 1410-1421

History

  • Received: Nov 27, 1991
  • Accepted: May 8, 1992
  • Published in issue: Dec 1, 1992

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Keywords

  1. amplitude modulation
  2. speech understanding
  3. temporal resolution
  4. elderly
  5. sensorineural hearing loss

Authors

Affiliations

Gail A. Takahashi
Sid P. Bacon

Notes

Contact author: Gail A. Takahashi, PhD, Department of Speech and Hearing Science, JG-15, University of Washington, Seattle, WA 98195.

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