Abstract
The perception of a synthetic fricative noise as /∫/ or /s/ is influenced by an adjacent vocalic segment. The influence is greater when the synthetic noise replaces the natural friction in FV syllables than in VF syllables [S. D. Soli and V. A. Mann, J. Acoust. Soc. Am. Suppl. 1 71, S75 (1982)]. These differences could be due to differing articulatory interactions in the production of FV and VF syllables, or, alternatively, to a strategy favoring later-occurring acoustic cues. These hypotheses were tested in a perceptual study using vocalic segments from natural FV and VF syllables, where F = /∫/ and /s/, and V = /ɑ/ and /u/. The vocalic segments were combined with synthetic friction noises to yield VFV stimuli, allowing a direct assessment of the relative strength of vocalic cues on either side of the friction noise. The results showed that the influence of fricative place of articulation cues was restricted to following vocalic segments. However, lip-rounding cues in both the preceding and following segments influenced fricative perception. These findings are consistent with the view that the observed perceptual asymmetries are based on coarticulatory asymmetries. [Supported by NICHD.]
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