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The broader language phenotype of autism: a comparison with specific language impairment

Authors


  • Conflict of interest statement: No conflicts declared.

Andrew Whitehouse, Department of Experimental Psychology, Oxford University, South Parks Road, Oxford OX13UD, UK; Tel: 01865271334; Fax: 01865281255; Email: andrew.whitehouse@psy.ox.ac.uk

Abstract

Background:  Some individuals with autism spectrum disorders (ASD) experience linguistic difficulties similar to those found in individuals with specific language impairment (SLI). Whether these behaviours are indicative of a common underlying genetic cause or a superficial similarity is unclear.

Methods:  Standardised language assessments were administered to three participant groups: parents of children with ASD (Par-A), parents of children with specific language/literacy impairment (Par-L) and parents of typically developing children (Par-T) (n = 30, in each group). Additionally, the Autism-Spectrum Quotient (AQ) was used to assess autism-like tendencies, in particular, social language use.

Results:  The Par-A group performed better than the Par-L group (and identical to the Par-T group) on all language tests. Conversely, the Par-A group was characterised by higher levels of pragmatic difficulties than the other two groups, as measured by the communication subscale of the AQ.

Conclusions:  No evidence was found for a shared phenotype in parents of children with ASD and SLI. A model is presented describing the relation between SLI and ASD.

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