Sample children (two TD and two ASD) with full ADOS-2 tasks and lead-lag profile capturing the child-clinician interactions during the test. Metrics were derived from weighted directed graphs with outstrength measure at each node tallied to quantify which body parts lead the interaction and who leads the social exchange overall, minute by minute. Notice that TD children lead most of the time, while ASD children tend to lag in the interactions. The weighted, directed graphs were derived from cross-coherence analyses of synchronously coregistered motions from inertial measurement units (IMUs) and gyroscopes in a grid of wireless wearable sensors across the body (Whyatt & Torres, 2017).