Folie a deux, also called dual psychosis, involves the transfer of delusional ideas from a psychotic individual to a nonpsychotic individual within the framework of a close relationship, with the eventual in corporation of the delusional system into the psyche of the previously non psychotic individual.
Mayekar, MD, Ulhas
"Folie á Deux,"
Jefferson Journal of Psychiatry:
1, Article 11.
Available at: http://jdc.jefferson.edu/jeffjpsychiatry/vol4/iss1/11