“…Results of this study showed that autistic children engaged in somewhat higher levels of stereotypic behavior by the age of 2, but the gap widened at ages 3 and 4. Similarly, Bush et al (2022) and Nuhu and Rapp (2020) examined eye contact in neurotypical individuals, which is a commonly targeted prosocial behavior in behavior analytic programming. Relatively more research on problem behavior prevalence, trajectories, and environmental correlates has been conducted using survey measures (e.g., Campbell et al, 2006;Harrison et al, 2012;Koot & Verhulst, 1991;McDermott & Schaefer, 1996;NICHD, 2004).…”