The purpose of the current study was to use the infant sibling design to explore whether proband traits of autism and ADHD could provide information about their infant sibling's temperament. This could help us to gain information about the extent to which infant temperament traits are differentially associated with autism and ADHD traits. We used…

Fragile X syndrome (FXS) is characterized by both social approach and social avoidance. However, the age of emergence and developmental trajectory of social avoidance has not been examined. This study investigates the longitudinal developmental trajectory and dynamic nature of social avoidance in males with FXS from infancy through young adulthood…

This study compared the adaptive behaviors of 20 autistic, 20 Down's syndrome, and 20 normal children matched on age equivalent adaptive behavior, gender, race, birth order, family size, and socioeconomic status. The autistic children displayed significant and pervasive deficits in the acquisition of adaptive social skills and greater variability…