Capgras syndrome is named after Joseph Capgras, the French psychiatrist who first described this delusion in 1923. He is the founder and discoverer of this condition, which is why the syndrome bears his name, a rare neuropsychiatric disorder in which a person is convinced that their loved one (spouse, relative, friend) has been replaced by the exact same doppelgänger or impostor. It belongs to the group of delusional erroneous identification syndromes. It is most often found in schizophrenia, dementia (especially Alzheimer’s disease and dementia with Lewy bodies), as well as after traumatic brain injuries. Presumably occurs due to a disruption in the communication between facial recognition and emotional processing systems in the brain.