Capgras syndrome

 This syndrome is named for Joseph Capgras, a French psychiatrist who explored the illusion of doubles. Those with Capgras syndrome hold the delusional belief that someone in their life, usually a spouse, close friend, or family member, has been replaced by an impostor. It can occur in patients with schizophrenia, dementia, or epilepsy and after traumatic brain injury. Treatment approaches mirror those utilized for the underlying disorders and often include antipsychotic medications.