Four boys (ages 5 to 12) with developmental disabilities and severe challenging behaviors were evaluated using two functional assessment procedures: different analog probe conditions, and direct classroom observation of the child's behavior, antecedents, and consequences. Results raised questions about the reliability and ecological validity of…

This paper presents a case report of a young adult Japanese male with infantile autism who also met diagnostic criteria for seasonal affective disorder and trichotillomania (compulsive hair pulling). The case report deals with difficulties in diagnosing mood disorder in such individuals, potential treatment effectiveness of valproic acid, and…

This paper reviews the research on fragile X syndrome, the second most common cause of mental retardation related to chromosomal anomaly. It notes that far more males than females are affected by the fragile X syndrome, which typically results in craniofacial changes, delays in growth and development, speech/language difficulties, and cognitive…