Naturalistic Language Recordings Reveal “Hypervocal” Infants at High Familial Risk for Autism |
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| Authors: | Meghan R Swanson Mark D Shen Jason J Wolff Brian Boyd Mark Clements James Rehg Jed T Elison Sarah Paterson Julia Parish‐Morris J Chad Chappell Heather C Hazlett Robert W Emerson Kelly Botteron Juhi Pandey Robert T Schultz Stephen R Dager Lonnie Zwaigenbaum Annette M Estes Joseph Piven the IBIS Network |
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| Institution: | 1. University of North Carolina at Chapel Hill;2. University of Minnesota;3. Georgia Institute of Technology;4. Temple University;5. The Children's Hospital of Philadelphia;6. Washington University;7. University of Washington;8. University of Alberta |
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| Abstract: | Children's early language environments are related to later development. Little is known about this association in siblings of children with autism spectrum disorder (ASD), who often experience language delays or have ASD. Fifty‐nine 9‐month‐old infants at high or low familial risk for ASD contributed full‐day in‐home language recordings. High‐risk infants produced more vocalizations than low‐risk peers; conversational turns and adult words did not differ by group. Vocalization differences were driven by a subgroup of “hypervocal” infants. Despite more vocalizations overall, these infants engaged in less social babbling during a standardized clinic assessment, and they experienced fewer conversational turns relative to their rate of vocalizations. Two ways in which these individual and environmental differences may relate to subsequent development are discussed. |
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