Autism Spectrum Disorder is characterized by difficulties with speech and nonverbal communication, by unusual and repetitive behaviors, by difficulty with changes in environment and routines, social challenges and often by unique strengths.
There are three main types of Autism Spectrum Disorder:
Autistic Disorder with significant language difficulty; social and communication challenges; repetitive behaviors such as hand flapping, rocking and spinning; obsession with unusual objects and often an intellectual disability.
Asperger Syndrome with milder symptoms of Autistic Disorder. They might have social challenges and unusual behaviors and interests, yet they have normal language and intellectual ability.
Pervasive Developmental Disorder– Not Otherwise Specified (PDD-NOS) with milder and fewer symptoms than with autistic disorder yet which might cause social and communication challenges.