The behaviours of infants were observed using home videos, in an attempt to identify social difficulties characteristic of infants with autistic disorder. Three groups of infants were analysed: 15 infants who had later been diagnosed with autism, 15 infants who had a developmental or language delay, and 15 typically developing infants. Social…

Siblings, mothers, and fathers in nine families of a child with autism were observed in dyadic play interactions with the autistic child. Parents exhibited more play behaviors toward children than siblings, but the autistic children initiated more interactions toward siblings than toward parents. Vineland Adaptive Behavior scale scores correlated…