Abstract
In three experiments, we determined how perception of the syllable-initial distinction between the stop consonant [b] and the semivowel [w], when cued by duration of formant transitions, is affected by parts of the sound pattern that occur later in time. For the first experiment, we constructed four series of syllables, similar in that each had initial formant transitions ranging from one short enough for [ba] to one long enough for [wa], hut different in overall syllable duration. The consequence in perception was that, as syllable duration increased, the [b-w] boundary moved toward transitions of longer duration. Then, in the second experiment, we increased the duration of the sound by adding a second syllable, [da], (thus creating [bada-wada]), and observed that lengthening the second syllable also shifted the perceived [b-w] boundary in the first syllable toward transitions of longer duration; however, this effect was small by comparison with that produced when the first syllable was lengthened equivalently. In the third experiment, we found that altering the structure of the syllable had an effect that is not to be accounted for by the concomitant change in syllable duration: lengthening the syllable by adding syllable-final transitions appropriate for the stop consonant [d] (thus creating [bad-wad]) caused the perceived [b-w] boundary to shift toward transitions of shorter duration, an effect precisely opposite to that produced when the syllable was lengthened to the same extent by adding steady-state vowel. We suggest that, in all these cases, the later-occurring information specifies rate of articulation and that the effect on the earlier-occurring cue reflects an appropriate perceptual normalization.
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This research was supported by NINCDS Grant NS 14394 to J. L. Miller, HEW Biomedical Research Support Grant RR 07143 to Northeastern University, and N1CHD Grant HD 01994 to Haskins Laboratories. Portions of the research were presented at the 95th meeting of the Acoustical Society of America, Providence, 1978. A. M. Liberman is also at the University of Connecticut and Yale University.
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Miller, J.L., Liberman, A.M. Some effects of later-occurring information on the perception of stop consonant and semivowel. Perception & Psychophysics 25, 457–465 (1979). https://doi.org/10.3758/BF03213823
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DOI: https://doi.org/10.3758/BF03213823