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Journal of Speech, Language, and Hearing Research Vol.52 696-705 June 2009. doi:10.1044/1092-4388(2008/07-0094)
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Articles

Effect of Vowel Identity and Onset Asynchrony on Concurrent Vowel Identification

Mark S. Hedrick
The University of Tennessee

Steven G. Madix
Louisiana Tech University

Contact author: Mark S. Hedrick, University of Tennessee, Knoxville, Department of Audiology and Speech Pathology, 578 South Stadium Hall, Knoxville, TN 37996-0740. E-mail: mhedric1{at}utk.edu.

Purpose: The purpose of the current study was to determine the effects of vowel identity and temporal onset asynchrony on identification of vowels overlapped in time.

Method: Fourteen listeners with normal hearing, with a mean age of 24 years, participated. The listeners were asked to identify both of a pair of 200-ms vowels (referred to as double vowels) presented either simultaneously or with a temporal asynchrony ranging from 25 ms to 150 ms in 25-ms steps. The stimuli were synthetic steady-state vowels /i æ a u revopenehook/ arranged in seven combinations: /u i/, /æ a/, /revopenehook a/, /revopenehook æ/, /æ i/, /revopenehook i/, and /revopenehook u/.

Results: Listeners' responses revealed that one vowel of a pair was identified correctly more often than the other vowel (known as vowel dominance). Vowel dominance effects were seen for 6 of the 7 vowel pairs, and there was improvement of vowel identification with increasing temporal separation between vowels for 5 of the 7 pairs. Vowel pairs with the vowel /revopenehook/ consistently yielded improved identification with increases in temporal asynchrony.

Discussion: Peripheral masking cannot explain the patterns of results of this study. A more parsimonious explanation may be perceptual anchoring.

KEY WORDS: speech perception, vowel identification, onset asynchrony


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