1. Folie imposee (imposed psychosis) - Described by Lasegue and Falret in 1877. The delusions are transferred from an individual with psychosis to an individual without psychosis in an intimate relationship. The delusions in the induced individual soon disappear once the two are separated.
2. Folie simultanee (simultaneous psychosis) - Described by Regis in 1880. Both partners share the psychosis simultaneously. They both have risk factors through long social interactions that predispose them to develop this condition. There are reports of sharing genetic risk factors among siblings.
3. Folie communiquée (communicated psychosis) - Described by Marandon de Montyel in 1881. This type is similar to folie imposee; however, the delusion in the secondary partner occurs after a long period of resistance. Also, the secondary partner will maintain the delusion even after separation from their partner.
4. Folie induite (induced psychosis) - Described by Lehmann in 1885. In this type, new delusions are assumed by an individual with psychosis who is being influenced by another individual with psychosis.
   
   
   References: 

https://pubmed.ncbi.nlm.nih.gov/31095356/#:~:text=Shared%20psychotic%20disorder%20

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6876800/

Diagnostic and Statistical Manual of Mental Disorders Fifth Edition DSM-5

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