If Mind Blindness theory is true, ASD children should not be able to or should show impaired ability to determine the mental states of others.

To test this, the false belief task of the Sally-Ann task was devised by Wimmer and Perner (1983). In this task, Sally puts a marble in a basket while Ann is watching. Sally leaves, Ann moves the marble to a box while Sally is not looking. Sally returns, and the question is posed where Sally will search for her marble. If a child understands Sally's beliefs and point of view, they will answer basket, as that is where she last saw it. If a child doesn't understand Sally's point of view, they will answer box, because that is where the marble currently is.

• Sally-Ann Task Results
• Potential Problems with the False Belief Task