Effect of F2 Intensity on Identity of /u/ in Degraded Listening Conditions The current study investigated the influence of the second formant (F2) intensity on vowel labeling along a /u/-/i/ continuum. Twenty-two listeners with normal-hearing (NH) sensitivity and 14 listeners with sensorineural hearing impairment (HI) were initially presented 2 stimuli for which the F2 intensity differed by 20 dB. The listeners were ... Research Article
Research Article  |   October 01, 2004
Effect of F2 Intensity on Identity of /u/ in Degraded Listening Conditions
 
Author Affiliations & Notes
  • Mark S. Hedrick
    The University of Tennessee, Knoxville
  • Anna K. Nabelek
    The University of Tennessee, Knoxville
  • Corresponding author: e-mail: mhedric1@utk.edu
  • Contact author: Mark S. Hedrick, PhD, Department of Audiology & Speech Pathology, The University of Tennessee, 457 South Stadium Hall, Knoxville, TN 37996-0740. E-mail: mhedric1@utk.edu
Article Information
Hearing & Speech Perception / Acoustics / Hearing Disorders / Speech, Voice & Prosody / Hearing / Research Articles
Research Article   |   October 01, 2004
Effect of F2 Intensity on Identity of /u/ in Degraded Listening Conditions
Journal of Speech, Language, and Hearing Research, October 2004, Vol. 47, 1012-1021. doi:10.1044/1092-4388(2004/075)
History: Received May 9, 2003 , Revised October 27, 2003 , Accepted February 26, 2004
 
Journal of Speech, Language, and Hearing Research, October 2004, Vol. 47, 1012-1021. doi:10.1044/1092-4388(2004/075)
History: Received May 9, 2003; Revised October 27, 2003; Accepted February 26, 2004
Web of Science® Times Cited: 2

The current study investigated the influence of the second formant (F2) intensity on vowel labeling along a /u/-/i/ continuum. Twenty-two listeners with normal-hearing (NH) sensitivity and 14 listeners with sensorineural hearing impairment (HI) were initially presented 2 stimuli for which the F2 intensity differed by 20 dB. The listeners were asked to label the 2 stimuli categorically as /u/ or /i/. After passing this criterion test, listeners were presented 9 stimuli whose F2 intensity varied within the 20-dB range. The 9 stimuli were evaluated in 3 listening conditions: in quiet, in the presence of a continuous speech spectrum noise (0-dB signal-to-noise ratio), and in the presence of reverberation (T = 1.0 s). The intensity manipulation altered the vowel labeling of NH listeners and yielded a differential effect in noise versus reverberation. Only 5 of the HI listeners were able to pass the criterion test, and of these 5, only 2 were able to label the 9 stimuli categorically. Results from HI listeners suggest problems in categorizing spectral shape.

Acknowledgments
Support for this project was provided in part by Grant 1 R55 DC03682 from the National Institute on Deafness and Other Communication Disorders. We thank Cliff Franklin for his assistance in data collection.
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