PERCEPTUAL WEIGHTING OF SYLLABLE-INITIAL FRICATIVES FOR NATIVE JAPANESE ADULTS AND FOR CHILDREN WITH PERSISTENT DEVELOPMENTAL ARTICULATION DISORDERS

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Background : Persistent developmental articulation disorder and language learning impairment are suspected to concur due to a speech processing deficit. The change in children's perceptual strategies is proposed as an indicator of development of speech processing ability (Nittrouer & Miller, 1997b). To diagnose a speech processing deficit and intervene in it early, we examined perceptual weight in an attempt to identify a marker for the development of speech processing ability. Methods : Forty-two native Japanese adults without speech disorder and 2 native Japanese children with persistent developmental articulation disorder and language learning impairment participated the study. They identified tokens from a /∫/-/s/ continuum followed by vocalic portions with formant transitions changing continuously from ones appropriate for /∫/ to those for /s/. Findings : Most adults weighted to the spectrum of the fricative noise more than to formant transition in the same manner as the adults in Nittrouer and Miller. However, as compared with most adults, a small number of adults and the 2 children judged based more on the formant transitions than on the spectrum of the fricative noise like 3- to 4-year-old typically developing children in Nittrouer and Miller. Interpretation : The perceptual weight assigned by adults suggested that they did not perceive uniformly. The perceptual weight assigned by the 2 children indicated that their speech perception ability might develop differently from that of typically developing children because of speech processing deficits.
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PERCEPTUAL WEIGHTING OF SYLLABLE-INITIAL FRICATIVES FOR NATIVE JAPANESE ADULTS AND FOR CHILDREN WITH PERSISTENT DEVELOPMENTAL ARTICULATION DISORDERS

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