How are Autism Spectrum Disorders defined?
ASDs are defined by difficulty in three areas of behaviors: 1) reciprocal social interaction, 2) communication and 3) repetition and insistence on sameness. Exactly how an individual is impacted across these three areas varies greatly. There is no one behavior that is present in all individuals with ASDs or that would rule out ASDs in every person. Many, but not all, individuals with ASD have language delays. Some individuals with ASD, but not all, have lifelong language disorders. Some, but not all, individuals with ASD also have mental retardation that affects development of nonverbal problem-solving, everyday self-care (e.g., dressing; academics) and language.
