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Capgras delusion
The Capgras delusion (or Capgras syndrome) (, )〔(Ramachandran interview showing usual pronunciation by experts )〕 is a disorder in which a person holds a delusion that a friend, spouse, parent, or other close family member (or pet) has been replaced by an identical-looking impostor. The Capgras delusion is classified as a delusional misidentification syndrome, a class of delusional beliefs that involves the misidentification of people, places, or objects (usually not in conjunction). It can occur in acute, transient, or chronic forms. Cases in which patients hold the belief that time has been "warped" or "substituted" have also been reported.
The delusion most commonly occurs in patients diagnosed with paranoid schizophrenia, but has also been seen in patients suffering from brain injury and dementia. It presents often in individuals with a neurodegenerative disease, particularly at an older age. It has also been reported as occurring in association with diabetes, hypothyroidism and migraine attacks. In one isolated case, the Capgras delusion was temporarily induced in a healthy subject by the drug ketamine. It occurs more frequently in females, with a female:male ratio of 3:2.
==Signs and symptoms==
The following two case reports are examples of the Capgras delusion in a psychiatric setting:
The following case is an instance of the Capgras delusion resulting from a neurodegenerative disease:
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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