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Journal of Speech and Hearing Research Vol.35 1189-1199 October 1992.
© American Speech-Language-Hearing Association
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The Role of Spectral and Temporal Cues in Vowel Identification by Listeners With Impaired Hearing

W. Van Summers 1
Marjorie R. Leek 1
1 Walter Reed Army Medical Center Washington, DC

This study examined the use of duration and formant frequency in the labeling of synthetic CVC stimuli forming a beet-bit continuum. Durational and F2 frequency cues to vowel identity varied systematically across stimuli. Subjects with normal hearing tended to rely primarily on F2 frequency in vowel labeling, whereas subjects with impaired hearing relied less on F2 information. This group difference was observed even for stimuli with large F2 differences, which were easily discriminated by all subjects. The effect of vowel duration on labeling was similar for both groups, with long-duration stimuli receiving more "beet" responses than short-duration stimuli across the F2 range. Psychoacoustic measures of frequency resolution and temporal resolution were poor predictors of a subject's use of formant information and duration information in labeling.

KEY WORDS: speech perception, vowel identification, hearing impairment, frequency resolution, temporal resolution

Submitted on December 15, 1991
Accepted on March 17, 1992


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