Spectral and Perceptual Evidence for CV Coarticulation in Devoiced /si/ and /syu/ in Japanese

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Abstract
We examined the spectral and perceptual characteristics of devoiced /si/ and /syu/ syllables in Japanese. Measurements showed that the deleted vowel can color the spectrum of the [∫] in these syllables, although the mean influence is small. Perception tests showed that Japanese listeners can use this spectral coloring as a cue to the identity of the underlying vowel, although identification was substantially worse than in syllables where the /i/ or /u/ is maintained. These results suggest that a supposedly lower-level coarticulation between the fricative and the vowel can occur before a higher-level process deletes the vowel, contradicting the order implied by traditional accounts of speech as a translation of discrete phonological units.

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