Heinz Wimmer studied the development of belief understanding with unexpected-transfer stories. The task requires predicting a protagonist’s action when that protagonist lacks information available to the child. Separating reality from an agent’s informational perspective made false belief an experimentally tractable question rather than an inference from social competence in general. [ref]
Beliefs about beliefs by Heinz Wimmer and Josef Perner. 1983, false-belief stories and action predictions
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