Abstract
We investigated gesturesthat parents used with 12-, 18-, and 24-month-old infants at high or low risk for autism spectrum disorder (ASD;high-risk diagnosed with ASD:n = 21; high-risk classified as no ASD:n = 34; low-risk classified as no ASD:n = 34). We also examined infant responses to parent gestures and assessed the extent to which parent gesture relates to vocabulary development. Parents of three groups gestured in similar frequencies and proportions. Infants, in turn, responded similarly to parent gestures regardless of the infant's ASD risk and later diagnosis. Finally, parents who gestured more at 12months had children with better vocabulary at 36months than parents who gestured less. These findings highlight the importance of examining parent gestures when predicting language development.
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