'Form is easy, meaning is hard' revisited: (re) characterizing the strengths and weaknesses of language in children with autism spectrum disorder.

Children with autism spectrum disorder (ASD) demonstrate impairments in social interaction and communication, and in repetitive/stereotypical behaviors. The degree to which children with ASD also manifest impairments in structural language-such as lexicon and grammar-is currently quite controversial. We reframe this controversy in terms of Naigles' (Naigles, Cognition 2002, 86: 157-199) 'form is easy, meaning is hard' thesis, and propose that the social difficulties of children with ASD will lead the meaning-related components of their language to be relatively more impaired than the form-related components. Our review of the extant literature supports this proposal, with studies (1) reporting that children with ASD demonstrate significant challenges in the areas of pragmatics and lexical/semantic organization and (2) highlighting their good performance on grammatical assessments ranging from wh-questions to reflexive pronouns. Studies on children with ASD who might have a co-morbid grammatical impairment are discussed in light of the absence of relevant lexical-semantic data from the same children. Most importantly, we present direct comparisons of assessments of lexical/semantic organization and grammatical knowledge from the same children from our laboratory, all of which find more children at a given age demonstrating grammatical knowledge than semantic organization. We conclude with a call for additional research in which in-depth grammatical knowledge and detailed semantic organization are assessed in the same children. WIREs Cogn Sci 2017, 8:e1438. doi: 10.1002/wcs.1438 This article is categorized under: Linguistics > Language Acquisition Linguistics > Language in Mind and Brain Neuroscience > Development.