Classic autism

Classic autism is a historical diagnostic term for early-onset autism, often involving pronounced social-communication differences and restricted or repetitive behaviors. It was commonly diagnosed as autistic disorder or Kanner syndrome before autism diagnoses were consolidated into broader categories.

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Autism spectrum disorder: A neurodevelopmental condition involving persistent social-communication differences and restricted or repetitive patterns of behavior or interests. Classic autism is now understood within this broader diagnostic category.
Leo Kanner: A child psychiatrist whose 1943 paper described eleven children with a distinctive pattern he called early infantile autism. Kanner's case series became the historical foundation for the term.
Asperger syndrome: A historical diagnosis for autistic people described as having typical language development and no significant intellectual disability. It was once distinguished from autistic disorder, though both are now within autism spectrum disorder.
Autism diagnosis: The clinical process of determining whether a person's developmental profile meets established criteria for autism. Older classic-autism records must be interpreted alongside current diagnostic criteria.
Autistic disorder: A diagnosis in earlier editions of the DSM for autism with childhood onset and specified social, communication, and behavioral features. This was the formal DSM diagnosis often called classic autism.
Early infantile autism: An early clinical label for autism appearing in the first years of life. This phrase captured the early onset emphasized in classic autism.
Pervasive developmental disorder not otherwise specified: A former diagnosis for pervasive developmental difficulties that did not meet criteria for a more specific category. It was another DSM-IV category later folded into autism spectrum disorder.
Autism spectrum: The range of developmental profiles and support needs associated with autism. The spectrum framework replaced a simple split between classic autism and other diagnoses.
Kanner syndrome: A historical name for an early-described form of autism associated with Leo Kanner's clinical account. The name links classic autism to Kanner's influential description.
DSM-III: The 1980 edition of the Diagnostic and Statistical Manual of Mental Disorders, which introduced autism as a distinct diagnosis. Its diagnostic category helped establish autistic disorder as a formal label.