Just over ten years ago my colleagues and I asked the question "Do children with autism have a 'theory of mind'?" (Baron-Cohen, Leslie, and Frith, 1985). Using a false-belief test (Wimmer and Perner, 1983) we arrived at a prelimi nary answer. The majority of children with autism failed the test, which sug gested that they were indeed impaired in the development of a theory of mind. A theory o...