Unlike people with classic autism, which is often accompanied by mental retardation, those with Asperger's have normal language development and intelligence.

Second, science hasn't had a proper chance to test if there is a biological difference between Asperger syndrome and classic autism.

Children with classic autism have language delays or deficits and difficulty relating to others; they display rigid, often obsessive behaviors; deviation from routine disturbs them.

It can be contrasted with aspie to refer to those specifically diagnosed with classic autism.

This is more likely 2-4% for classic autism and 10-20% for a broader spectrum.

Assuming a general-population prevalence of 0.1%, the risk of classic autism in siblings is 20- to 40-fold that of the general population.

In this framework, Asperger syndrome is distinguished from "classic" high functioning autism primarily by a lack of language or cognitive deficits.

Kim Miller (born 1988) is an American artist who was diagnosed with "classic" autism in 1991.

There is 'classic' autism, and forms of mental handicap where the children are said to possess autistic tendencies.

At one end, comprising approximately half the autistic population, are children with classic autism, trapped in their own private world, needing constant supervision.