The aim of the study was to identify early behavioural abnormalities in children later diagnosed with autistic disorder. Accurate identification of such deficits has implications for early diagnosis, intervention and prognosis. The parents of 153 children with autistic disorder completed a questionnaire asking them to describe early childhood behaviours of concern and to recall the age of onset. Core deficit-linked behaviours were then identified and the ontogeny of their development was noted. Behaviour categories were: (1) gross motor difficulties, (2) social awareness and play deficits, (3) language and communication difficulties, and (4) unusual preoccupations. The findings supported the notion that the nature and prevalence of these deficits depend on age. Consistent with past research, there was a significant interval between parents first noticing abnormalities and the making of a definitive diagnosis. The implications for this delay are discussed.
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