Comparison of 40 children with Down's syndrome and typically developing children (matched for mental age) found that the children with Down's syndrome appeared less engaged in a task, as indicated by shorter sequences of goal directed behavior and higher rates of toy rejection. They also displayed less causality pleasure with object exploration…

Toddlers with Down's syndrome (n=42) were presented with situations in which the primary focus alternated between an object stimulus and a social stimulus. The experimental subjects monitored their environment in the same manner as did the 25 control subjects (matched for mental age) during object mastery but had a more focused attention style…

The purpose of the study was to determine whether particular aspects of movement control influenced the performance of 2-year-old children on a standard developmental test, and thus influenced assessments of intellectual progress based on that test. Six cerebral-palsied (CP) children were compared with six children not suffering motor system…