Temporal Effects in Simultaneous Masking by Vowel and Consonant-Vowel Maskers Temporal effects in simultaneous masking were studied using synthetic vowel (V) and consonant-vowel (CV) maskers. For the steady-state V maskers (/i,a,u/), signals were presented at the beginning or in the temporal center of the masker. The masking patterns generally reflected the formant differences among the vowels, and the formant structure ... Research Article
Research Article  |   March 01, 1990
Temporal Effects in Simultaneous Masking by Vowel and Consonant-Vowel Maskers
 
Author Affiliations & Notes
  • Sid P. Bacon
    Arizona State University
  • Patricia E. Blake
    Vanderbilt University School of Medicine
  • Requests for reprints should be sent to Sid P. Bacon, Department of Speech and Hearing Science, Arizona State University, Tempe, AZ 85287-0102.
Article Information
Research Articles
Research Article   |   March 01, 1990
Temporal Effects in Simultaneous Masking by Vowel and Consonant-Vowel Maskers
Journal of Speech, Language, and Hearing Research, March 1990, Vol. 33, 38-44. doi:10.1044/jshr.3301.38
History: Received May 9, 1989 , Accepted July 21, 1989
 
Journal of Speech, Language, and Hearing Research, March 1990, Vol. 33, 38-44. doi:10.1044/jshr.3301.38
History: Received May 9, 1989; Accepted July 21, 1989

Temporal effects in simultaneous masking were studied using synthetic vowel (V) and consonant-vowel (CV) maskers. For the steady-state V maskers (/i,a,u/), signals were presented at the beginning or in the temporal center of the masker. The masking patterns generally reflected the formant differences among the vowels, and the formant structure of each V masker was more clearly revealed when the signal was presented in the temporal center of the masker. For the CV maskers (/bi, gi/), signals were presented at the beginning of the (consonant portion of the) masker, at the beginning of the vowel portion of the masker, or in the temporal center of the masker. The second-formant difference between the maskers (observed acoustically at their onset) was generally revealed in the masking patterns when the signal was presented at the beginning of the consonant; this difference in the masking patterns was also present, to a lesser extent, when the signal was presented at the beginning of the vowel, where the two maskers were identical acoustically. The masking patterns for the two CV maskers were virtually identical when the signal was presented in the temporal center of the masker. These data extend previous tone-on-tone masking data and suggest that the auditory system requires a certain amount of time to represent most accurately the acoustic spectrum of both steady-state and dynamic complex maskers.

ACKNOWLEDGMENT
This research was supported by a grant from the National Institutes of Health (NINCDS NS25062). A portion of these data were presented at the 2nd joint meeting of the Acoustical Society of America and the Acoustical Society of Japan [Blake, P.E., & Bacon, S.P, (1988) . Temporal effects in vowel and consonant-vowel masking. Journal of the Acoustical Society of America, 84, Suppl. 1, S143]. We are grateful to D. W. Grantham and R. N. Ohde for their time and technical assistance with this project. We thank M. Cheesman and an anonymous reviewer for their useful comments on an earlier version of this paper.
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