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Capgras' Syndrome

(illusion of false recognition, illusion of doubles, illusion des sosies)

In this delusional misidentification phenomenon the afflicted individual believes others to be, or experiences others as, imposters who have impersonated or replaced familiar individuals.

Example: An older man, finding his wife sitting in their kitchen, orders her out of his house, accuses her of pretending to be his wife, and demands to be taken to his real wife immediately.