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Autism is associated with several genetic disorders, [4] perhaps due to an overlap in genetic causes. [5] About 10–15% of autism cases have an identifiable Mendelian (single-gene) condition, chromosome abnormality, or other genetic syndrome, [6] a category referred to as syndromic autism.
Approximately 8 in 10 people with autism have a mental health problem in their lifetime, in comparison to 1 in 4 of the general population. [132] [133] [134] A 2019 meta-analysis found autistic people to be four times more likely to have depression than non-autistic people, with approximately 40% of autistic adults having depression. [135]
Classic autism, also known as childhood autism, autistic disorder, or Kanner's syndrome, is a formerly diagnosed neurodevelopmental disorder first described by Leo Kanner in 1943. It is characterized by atypical and impaired development in social interaction and communication as well as restricted, repetitive behaviors, activities, and interests.
Gastrointestinal problems are one of the most commonly associated medical disorders in people with autism. [109] These are linked to greater social impairment, irritability, behavior and sleep problems, language impairments and mood changes, so the theory that they are an overlap syndrome has been postulated.
The neurodiversity paradigm is a view of autism as a different way of being rather than as a disease or disorder that must be cured. [39] [41] Autistic people are considered to have neurocognitive differences [33] which give them distinct strengths and weaknesses, and are capable of succeeding when appropriately accommodated and supported.
The term "high-functioning autism" was used in a manner similar to Asperger syndrome, another outdated classification.The defining characteristic recognized by psychologists was a significant delay in the development of early speech and language skills, before the age of three years. [12]
Classic autism - (or Kanner's syndrome) the first described form of autism written about in 1943; Pervasive developmental disorder (PDD) – as opposed to specific developmental disorders (SDD), refers to a group of five disorders characterized by delays in the development of multiple basic functions including socialization and communication.
In 1964–7, Australian autistic people and their parents founded what is now Autism SA (1964), [228] the Autistic Children's Association of New South Wales (now Aspect, 1966), [229] Victorian Autistic Children's and Adult's Association (now Amaze, 1967), [230] Autistic Children's Association of Queensland (now Autism Queensland, 1967), [231 ...