[[File:Simon Baron-Cohen.jpg|right|thumbnail|200px|The [[Autism-spectrum quotient|autism-spectrum quotient]] is a questionnaire published by [[Simon Baron-Cohen]] and his coworkers at the Autism Research Centre in Cambridge, UK. The questionnaire consists of fifty questions and aims to determine whether adults of average intelligence have symptoms of autism or one of the other autism spectrum conditions.<ref>Woodbury-Smith MR, Robinson J, Wheelwright S, Baron-Cohen S (2005). "[http://docs.autismresearchcentre.com/papers/2005_Woodbury-Smith_etal_ScreeningAdultsForAS.pdf Screening adults for Asperger Syndrome using the AQ: a preliminary study of its diagnostic validity in clinical practice]" (PDF). J Autism Dev Disord 35 (3): 331–5.</ref>]]
According to the DSM-IV, autism is characterized by the following:
According to the DSM-IV, autism is characterized by the following: