![]() Generally, it is perceived as a rare condition of unclear etiology, intriguing as a “nature or nurture” phenomenon, and challenging our understanding of the roots of psychopathology. In the literature, folie à deux is described typically in case reports (Adler & Magruder, 1946 Florez & Gomez-Romero, 2001 Gant & Brown, 2001 Joshi et al., 2006 Oatman, 1947 Petrikis, Andreou, Karavatos, & Garyfallos, 2003 Reif & Pfuhlmann, 2004 Shiwach & Sobin, 1998), so definite prevalence rates are lacking. It was first described as folie à deux by Lasegue and Falret in 1877 (Joshi, Frierson, & Gunter, 2006). The essence of this phenomenon is a transfer of delusions from one person (inducer) to another (recipient, involved or induced partner). ![]() ![]() Shared psychotic disorder (SPD) or folie à deux, induced psychosis, and induced delusional disorder (IDD) is that which is shared by two or more people with close emotional links. ![]()
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