Folie à deux (French for 'madness of two'), also called shared psychosis or shared delusional disorder (SDD), is a rare psychiatric syndrome in which symptoms of a delusional belief are "transmitted" from one individual to another. The disorder, first conceptualized in 19th century French psychiatry by Charles Lasègue and Jules Falret, is also known as Lasègue–Falret syndrome.
Folie à deux (French for 'madness of two'), also called shared psychosis or shared delusional disorder (SDD), is a rare psychiatric syndrome in which symptoms of a delusional belief are "transmitted" from one individual to another. The disorder, first conceptualized in 19th century French psychiatry by Charles Lasègue and Jules Falret, is also known as Lasègue–Falret syndrome.
Source: Wikipedia "Folie à deux" · CC BY-SA 4.0
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