'Obsessions' in children with autism or Asperger syndrome - Content analysis in terms of core domains of cognition

Background We report a survey of the content of obsessions in children with autism spectrum conditions. We use the term 'obsessions' narrowly. to indi cate strong. repetitive interests. We predicted that obsessions would not c luster randomly, but rather would occur significantly more often in the dom ain of 'folk physics' tan interest in how things work). and significantly l ess often in the domain of 'folk psychology' tan interest in how people wor k). These predictions were tested relative to a control group of 33 childre n with Tourette syndrome. Aims To examine the content of autistic obsessions. and to test the theory that these reflect an evolved cognitive style of good folk physics alongsid e impaired folk psychology Method Ninety-two parents returned a questionnaire designed to determine th e subject of their child's obsessional interests. The results were analysed in terms of core domains of cognition. Results Both predictions were confirmed. Conclusions These results suggest that impaired folk psychology and superio r folk physics are part of the cognitive phenotype of autism. A content-fre e theory of obsessions is inadequate. Declaration of interest The authors were supported by the Medical Research Council during the period of this work.