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The Sally–Anne test is a psychological test, used in developmental psychology to measure a person's social cognitive ability to attribute false beliefs to others (Wimmer & Perner, 1983). The flagship implementation of the Sally-Anne test was by Baron-Cohen, Leslie, and Frith (1985) ; in 1988, Leslie and Frith repeated the experiment with human actors (rather than dolls) and found similar results.

Test description
To develop an efficacious test, Baron-Cohen et al. modified the puppet play paradigm of Wimmer and Perner (1983), in which puppets represent tangible characters in a story, rather than hypothetical characters of pure storytelling. In the Baron-Cohen, Leslie, and Frith study of theory of mind in autism, 61 children—20 of whom were diagnosed autistic under established criteria, 14 with Down's Syndrome and 27 of whom were determined as clinically unimpaired—were tested with "Sally" and "Anne".

In the test process, after introducing the dolls, the child is asked the control question of recalling their names (the Naming Question). A short skit is then enacted; Sally takes a marble and hides it in her basket. She then 'leaves' the room and goes for a walk. While she is away, Anne takes the marble out of Sally's basket and puts it in her own box. Sally is then reintroduced and the child is asked the key question, the Belief Question: 'Where will Sally look for her marble?'

Outcomes
For a participant to 'pass' this test, he must answer the Belief Question correctly by indicating that Sally believes that the marble is in her own basket. This answer is continuous with Sally's perspective, but not with the participant's own. If the participant cannot take an alternative perspective, he will indicate that Sally has cause to believe, as the participant does, that the marble has moved. Passing the test is thus seen as the manifestation of a participant understanding that Sally has her own beliefs that may not correlate with reality; this is the core requirement of theory of mind.

In Baron-Cohen et al.'s study, 23 of the 27 clinically unimpaired children (85%) and 12 of the 14 Down's Syndrome children (86%) answered the Belief Question correctly. However, only four of the 20 autistic children (20%) answered correctly. Overall, children under the age of four, along with most autistic children (of older ages), answered the Belief Question with "Anne's box," seemingly unaware that Sally does not know her marble has been moved.

Criticism
While Baron-Cohen et al.'s data have been purported to indicate a lack of theory of mind in autistic children, there are other possible factors affecting them. For instance, individuals with autism may pass the cognitively simpler recall task, but have difficulty with semantically conceptualizing the Belief Question. Tager-Flusberg (2007) posited that the pass-fail designation derived from the Sally-Anne test "indexed" what is an overall "complex social-cognitive developmental progression," unfairly categorizing participants.

Ruffman, Garnham, and Rideout (2001) further investigated links between the Sally-Anne test and autism in terms of eye gaze as a social communicative function. Ruffman et al. added a third possible location for the marble: the pocket of the investigator. When autistic children and children with moderate learning disabilities were tested in this format, Ruffman et al. found that both groups answered the Belief Question equally well; however, participants with moderate learning disabilities reliably looked at the correct location of the marble, while autistic participants did not, even if the autistic participant answered the question correctly. These results may be an expression of the social deficits relevant to autism.

Implications
The Sally-Anne test remains highly associated with theory of mind, chiefly because of its role in the work of Baron-Cohen et al. The test is by no means fully conclusive; however, its application is telling about social development trends in autism.