Appersonation is a disorder different from impersonation, because the sufferer truly believes the delusion. Delusions are sometimes caused by stress, though often by a medical, mental, or neurological condition. But they're deeply believed by the sufferer.
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Appersonation
The delusional belief that one is another person (usually famous) or object, which leads to taking on their characteristics.
Appersonnification
La croyance délirante que l'on est une autre personne (généralement célèbre) ou un objet, ce qui conduit à adopter ses caractéristiques.