The Capgras Delusion

The Capgras Delusion is a rare
disorder in which a person holds the delusional belief
that an acquaintance (usually a spouse or other close
family member) has been replaced by an identical
impostor. Found in patients diagnosed with schizophrenia,
dementia, or those suffering from a brain injury, the
disorder is named after Joseph Capgras, the French
psychiatrist who first described it in 1923.
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