title: Naturalistic Language Recordings Reveal "Hypervocal" Infants at High Familial Risk for Autism.
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.
authors.affiliation: University of North Carolina at Chapel Hill.
authors.forename: Meghan R
authors.identifier: 0000-0001-8474-3458
authors.initials: MR
authors.lastname: Swanson
authors.affiliation: University of North Carolina at Chapel Hill.
authors.forename: Mark D
authors.initials: MD
authors.lastname: Shen
authors.affiliation: University of Minnesota.
authors.forename: Jason J
authors.initials: JJ
authors.lastname: Wolff
authors.affiliation: University of North Carolina at Chapel Hill.
authors.forename: Brian
authors.initials: B
authors.lastname: Boyd
authors.affiliation: Georgia Institute of Technology.
authors.forename: Mark
authors.initials: M
authors.lastname: Clements
authors.affiliation: Georgia Institute of Technology.
authors.forename: James
authors.initials: J
authors.lastname: Rehg
authors.affiliation: University of Minnesota.
authors.forename: Jed T
authors.initials: JT
authors.lastname: Elison
authors.affiliation: Temple University.|The Children's Hospital of Philadelphia.
authors.forename: Sarah
authors.initials: S
authors.lastname: Paterson
authors.affiliation: The Children's Hospital of Philadelphia.
authors.forename: Julia
authors.initials: J
authors.lastname: Parish-Morris
authors.affiliation: University of North Carolina at Chapel Hill.
authors.forename: J Chad
authors.initials: JC
authors.lastname: Chappell
authors.affiliation: University of North Carolina at Chapel Hill.
authors.forename: Heather C
authors.initials: HC
authors.lastname: Hazlett
authors.affiliation: University of North Carolina at Chapel Hill.
authors.forename: Robert W
authors.initials: RW
authors.lastname: Emerson
authors.affiliation: Washington University.
authors.forename: Kelly
authors.initials: K
authors.lastname: Botteron
authors.affiliation: The Children's Hospital of Philadelphia.
authors.forename: Juhi
authors.initials: J
authors.lastname: Pandey
authors.affiliation: The Children's Hospital of Philadelphia.
authors.forename: Robert T
authors.initials: RT
authors.lastname: Schultz
authors.affiliation: University of Washington.
authors.forename: Stephen R
authors.initials: SR
authors.lastname: Dager
authors.affiliation: University of Alberta.
authors.forename: Lonnie
authors.initials: L
authors.lastname: Zwaigenbaum
authors.affiliation: University of Washington.
authors.forename: Annette M
authors.initials: AM
authors.lastname: Estes
authors.affiliation: University of North Carolina at Chapel Hill.
authors.forename: Joseph
authors.initials: J
authors.lastname: Piven
mesh_terms: D000067877:Autism Spectrum Disorder / Q000503:physiopathology*; D002657:Child Development / Q000502:physiology*; D005260:Female; D006801:Humans; D007223:Infant; D018730:Infant Behavior / Q000502:physiology*; D008297:Male; D012306:Risk; D035781:Siblings; D012815:Signal Processing, Computer-Assisted; D012919:Social Behavior; D014705:Verbal Behavior / Q000502:physiology*