The social and motor context in which restricted and repetitive behaviors (RRBs) occur in autism and their relationship to social traits are not well-understood. Participants with and without autism completed tasks that varied in social and motor engagement and RRB frequency was measured. Motor and verbal RRBs were most common, RRBs varied based on motor and social context for participants with autism, and social engagement was associated with lower motor and verbal RRBs. Significant correlations between RRBs and autism severity, social synchrony, and nonverbal mental age were also found. This research confirms the importance of context for understanding RRBs during on-going tasks and raises questions about whether the factors that elicit vocal and motor RRBs are unique for individual children.
Keywords: Autism Spectrum Disorder; Joint attention; Motor engagement; Repetitive behavior; Social engagement; Social synchrony; Theory of mind.