The present research investigated whether Japanese children with autism spectrum disorders (ASD) show sensitivity to the discourse pragmatic constraints of the Preferred Argument Structure (PAS) proposed by Du Bois (1987). Verb argument omissions and lexicalizations in the spontaneous speech of 2 children with autism spectrum disorders (a boy 5 years 2 months old, and a girl 6 years 1 month old) and 2 typically developing (TD) children (a boy 2 years 8 months old, and a girl 2 years 9 months old) were analyzed. The children were matched on language development level. Each verb argument was coded for grammatical category (intransitive or transitive subject / object), the form of the argument (null, pronoun, or lexical), and the distinction of the referent (given or new). In addition, non-linguistic pragmatic information (e.g., pointing or gazing in the direction of the intended referent) was analyzed. The results revealed that both the children with autism spectrum disorders and the typically developing children showed linguistic patterns consistent with the constraints of the Preferred Argument Structure, suggesting that the children with autism spectrum disorders were sensitive to discourse pragmatic constraints in language in a way similar to the typically developing children. However, when pronouns were used, the children with autism spectrum disorders used significantly less non-linguistic pragmatic information than the typically developing children did, suggesting that, unlike the typically developing children, these children with autism spectrum disorders did not use pronouns effectively to specify intended referents. This finding is consistent with the view that ineffective use of non-linguistic pragmatic information by children with autism spectrum disorders may be one cause of their poor pragmatic abilities. In order to develop ways to support children with autism spectrum disorders to expand their communication abilities, future research should investigate how their ineffective use of non-linguistic pragmatic information is related to the feature of pragmatic abilities observed in children with autism spectrum disorders.
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