title: Stereotyped motor behaviors associated with autism in high-risk infants: a pilot videotape analysis of a sibling sample.
abstract: This study examined motor behaviors in a longitudinal cohort of infant siblings of children with autism. Stereotypic movements and postures occurring during standardized observational assessments at 12 and 18 months were coded from videotapes. Participants included eight infant siblings later diagnosed with autism spectrum disorder (ASD), a random sample of nine non-diagnosed siblings, and 15 controls. Videos were coded blind to diagnostic group. At 12 and 18 months the ASD group "arm waved" more frequently and at 18 months, one posture ("hands to ears") was more frequently observed in the ASD and non-diagnosed group compared to the controls. Overall, the siblings subsequently diagnosed with ASD and the comparison groups had considerable overlap in their repertoires of stereotyped behaviors.
authors.affiliation: The Hospital for Sick Children, University of Toronto, Toronto, ON, Canada.
authors.forename: Alvin
authors.initials: A
authors.lastname: Loh
authors.forename: Teesta
authors.initials: T
authors.lastname: Soman
authors.forename: Jessica
authors.initials: J
authors.lastname: Brian
authors.forename: Susan E
authors.initials: SE
authors.lastname: Bryson
authors.forename: Wendy
authors.initials: W
authors.lastname: Roberts
authors.forename: Peter
authors.initials: P
authors.lastname: Szatmari
authors.forename: Isabel M
authors.initials: IM
authors.lastname: Smith
authors.forename: Lonnie
authors.initials: L
authors.lastname: Zwaigenbaum
mesh_terms: D001321:Autistic Disorder / Q000453:epidemiology*; D002648:Child; D039721:Diagnostic and Statistical Manual of Mental Disorders; D005260:Female; D006225:Hand; D006801:Humans; D007223:Infant; D008297:Male; D015588:Observer Variation; D010865:Pilot Projects; D011187:Posture; D012307:Risk Factors; D035781:Siblings; D019956:Stereotypic Movement Disorder / Q000453:epidemiology*; D014743:Videotape Recording