Some articles on impos:

Glossary Of Psychiatry - List of Terms - F - Folie à Deux
... Folie communiquée, folie imposée, folie induite, and folie simultanée are the four subtypes of folie à deux ... Folie imposée Folie imposée, or subtype A of folie a deux, is the most common form in which the dominant person imposes a delusion into a person who was not previously mentally ill ...