Autism is a brain development disorder that impairs social interaction and communication, and causes restricted and repetitive behavior, all starting before a child is three years old. This set of signs distinguishes autism from milder autism spectrum disorders (ASD) such as Asperger syndrome. Unlike autism, Asperger's has no substantial delay in language development. The terminology of autism can be bewildering, with autism, Asperger's and PDD-NOS often called the autism spectrum disorders (AS… (More on Autism)