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Folie à Deux

A rare psychiatric occurrence in which one person’s psychotic symptom(s), such as delusions, are transmitted to another person. Literally means “madness shared by two” in French; the disorder is also known as shared psychotic disorder.

Example: A woman and her eight-year-old daughter both believe that Satan lives in their basement. Treatment of the mother cures the daughter.

Folie à Deux
APA Reference
Grinnell, R. (2018). Folie à Deux. Psych Central. Retrieved on August 11, 2020, from