An intervention approach emphasizing development of symbolic thought, communication, and interpersonal relationships was implemented with 26 children (ages 2-6) with pervasive developmental disorder, or severe emotional handicaps. Ss demonstrated significant changes in several targeted developmental areas, including cognition, perceptual/fine…

Findings from relevant research applying Piaget's theory to mental retardation, psychosis, and autism are reviewed. Many autistic individuals show an arrest in operative functions at the sensorimotor functions. The early arrest interferes with subsequent development of higher-level conceptual, symbolic, and social skills. (Author)

The communication of people with autism spectrum disorder (ASD) is characterized by a qualitative impairment in verbal and non-verbal communication. In past decades a growing body of descriptive studies has appeared on language and communication problems in ASD. Reviews suggest that the development of formal and semantic aspects is relatively…