folie à deux

a rare psychotic disorder in which two intimately related individuals simultaneously share similar or identical delusions (French, “double insanity”). It is the most common form of shared psychotic disorder. Rarer forms involving more than two intimately related individuals or members of the same family are called folie à trois (a delusion shared by three people), folie à quatre (a delusion shared by four people), and so on.

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Psychology term of the day

January 7th 2025

fact memory

memory for specific items of factual knowledge. Compare source memory.