The facial stereotypies of adults diagnosed as having mental retardation and tardive dyskinesia were examined through a kinematic analysis of videotaped lip and tongue movements. The high degree of movement variability found suggests that low variability of discrete properties of movement kinematics may not be a defining feature of stereotypies.…

Self-injurious behavior was examined in a case study of head-banging by an 8-year-old girl with profound mental retardation and an autistic disorder. Trajectories of arm movements and impact forces were determined from dynamic analysis of videotapes. Cycle-to-cycle consistency in the qualitative dynamics of the limb motions and impact forces…

A methodology that will allow teachers to assess a child's behavior problems within both Disruptive (D) and Nondisruptive (ND) contexts was developed, and a questionnaire that would attend to the issues of Manageability and Contagion, as well as Tolerance and Severity, was prepared. Initial questionnaire research using the Devereux Elementary…

This case study of a toddler with autism whose parents had videotaped her development from birth showed that the child's behavior and development were essentially normal for the first year but that she then became withdrawn in only a few months. It is suggested that early communicative screening tests might have identified the child's earliest…

Evaluation of 26 children (ages 24-55 months) with pervasive developmental disorder (PDD) while interacting with either the mother, a familiar female teacher, and an unfamiliar male doctor. PDD subjects were most severely impaired during the mother episode. During the teacher episode, PDD subjects were twice as variable in interpersonal response…