Atypicalities of Gesture Form and Function in Autistic Adults

J Autism Dev Disord. 2019 Apr;49(4):1438-1454. doi: 10.1007/s10803-018-3829-x.

Abstract

While well-represented on clinical measures, co-speech gesture production has never been formally studied in autistic adults. Twenty-one verbally fluent autistic adults and 21 typically developing controls engaged in a controlled conversational task. Group differences were observed in both semantic/pragmatic and motoric features of spontaneously produced co-speech gestures. Autistic adults prioritized different functions of co-speech gesture. Specifically, they used gesture more than controls to facilitate conversational turn-taking, demonstrating a novel nonverbal strategy for regulating conversational dynamics. Autistic adults were more likely to gesture unilaterally than bilaterally, a motoric feature of gesture that was individually associated with autism symptoms. Co-speech gestures may provide a link between nonverbal communication symptoms and known differences in motor performance in autism.

Keywords: Adulthood; Autism spectrum disorder; Conversation; Gesture; Motor skills; Nonverbal communication.

MeSH terms

  • Adult
  • Autistic Disorder / physiopathology*
  • Female
  • Gestures*
  • Humans
  • Male
  • Motor Skills / physiology
  • Semantics
  • Speech / physiology