Why is autism called a spectrum disorder?
Autism belongs to a collection of developmental disorders known as the autism spectrum disorders (ASDs). A spectrum disorder is a group of disorders with similar features. While one person may have mild symptoms, another might have more severe ones. There also are differences in the nature of the symptoms themselves and when they are likely to first appear. The three different types of autism spectrum disorders are: • Autistic disorder (also known as “classic” autism). This is the most common condition among the ASDs. It is marked by major delays in language, difficulties with social interactions, and unusual behaviors. Some people with autistic disorder also have impaired intellectual abilities. • Asperger syndrome. People with this syndrome display some of the milder symptoms of autistic disorder — such as social challenges and unusual behaviors. They generally do not have any delays in language or impaired intellectual abilities. • Pervasive Developmental Disorder – Not Otherwise S
