Abstract
We investigated autistic, mentally retarded, and normal children's ability to deceive or obstruct an opponent. When required to tell a lie (saying that a box was locked) autistic children performed significantly worse than their controls, taking into account mental age. However, they readily prevented a competitor from gaining a reward by physical manipulation (locking a box). Their success on sabotage demonstrated that their failure on deception was not due to an inability to understand the task. Performance on deception was predicted by performance on a false belief attribution task. The present findings confirm that autistic children have a specific deficit in understanding and manipulating beliefs.
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