Three relatively long-term observational studies, involving seven retarded preschool children, each of whom exhibited multiple stereotypes, were conducted to determine the extent to which the type of activity or setting had any effect upon the rates of stereotyped movements. (Author)

Results indicated that, despite SES group variation in level of performance, improvement (when it occurred) was evident for both high and low SES groups of children referred for classroom problems. (Author/SW)

Twenty hyperactive 6- to 9-year-old children of normal intelligence were studied in a half-day laboratory classroom in a double-blind condition in which half the Ss were placed on Ritalin and half on placebo. (Author/CL)