The cognitive ability to attribute mental states — beliefs, intentions, desires, emotions — to oneself and to others, and to understand that others may have different perspectives.
Term coined by David Premack and Guy Woodruff in 1978. From Greek 'theoria' (contemplation) + Old English 'mynd' (memory, thought).
Theory of mind is knowing that other people have their own thoughts, feelings, and views — which might be totally different from yours!
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