Studies of infant motor development in autism spectrum disorder (ASD) have increased in recent years. This article synthesized this literature through meta-analysis to assess (a) whether infant motor ability differs in ASD relative to neurotypical controls; and (b) whether motor ability and communication are related in infants with ASD. Study 1…

A prevailing theory of mathematical problem solving predicts that children will be less accurate solving a + b = c + __ problems versus a + b = __ + c. However, this has never been tested directly. Because of low base rates, information combined from multiple studies can help improve estimation accuracy and precision. This study compared…

Pooled data from previous studies in which autistic, mentally handicapped, and normal young children had been tested on theory of mind tasks. Found that normal children at a verbal mental age of four years, but autistic children at a verbal mental age of more than nine years, had a 50% chance of passing the theory of mind tests. (BC)

Differences between father-absent and father-present samples were not large. Although study quality was not the best predictor of outcome, the best-quality studies produced nonsignificant estimates of effect size. Most effect-size estimates were less than .5; many were much smaller. (RH)