Pervasive Developmental Disorder which is similar to autism but without clinically significant language delay. Language, however, is still used in a stilted and stereotyed manner. People with Asperger Syndrome have no general cognitive delay, meaning their overall IQ is in the normal range or above. The distinction between Asperger Syndrome and High Functioning Autism (HFA) is unclear, especially in adulthood.

People with Asperger Syndrome have difficulty with social understanding, and their patterns of behaviour are often inflexible. Language, and especially abstract language, can be hard for these people, but to a much lesser degree than with Kanner's autism.

Children who have autistic behavior but no problems with language.

NAS An autistic spectrum disorder that affects the way a person communicates and relates to others. A number of traits of autism are common to Asperger syndrome including: difficulty in communicating difficulty in social relationships a lack of imagination and creative play. However, people with Asperger syndrome usually have fewer problems with language than those with autism, often speaking fluently though their words can sometimes sound formal or stilted. People with Asperger syndrome also do not have the accompanying learning disabilities often associated with autism; in fact, people with Asperger syndrome are often of average or above average intelligence.

Asperger syndrome — also referred to as Asperger's syndrome, Asperger's, or just AS — is a pervasive developmental condition related to autism. It manifests in highly individual ways and can have both positive and negative effects on a person. It is recognized by the medical community as one of five neurobiological pervasive developmental disorders (PDD) considered to be part of the autistic spectrum.