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The concept of autism has widened from the typical, classic or nuclear autism of Kanner (1943), to include those with the ‘triad of social impairments’ (Wing & Gould, 1979); that is impaired social interaction, communication and imagination which is associated with narrow, stereotyped, repetitive patterns of behaviour. These features make up the ‘autistic spectrum disorders’ and include Kanner's and Asperger's syndromes (Box 1).
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