Capgras' Delusion

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The delusion that family, friends and others have been replaced by imposters. It typically follows the development of negative feelings toward the other person that the subject cannot accept and attributes, instead, to the imposter. The syndrome has been reported in paranoid schizophrenia and, even more frequently, in organic brain disease
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They argued Kot suffered from paranoia and other acute symptoms associated with Capgras delusion, a misidentification syndrome common in patients diagnosed with schizophrenia.
In Chapters 5 and 6 he discusses, respectively, the Capgras delusion (the belief that familiars have been replaced by impostors) and Cotard delusion (the view that one is dead or otherwise disembodied or non-existent), while in Chapter 7, based on the work of Louis Sass, he considers schizophrenia.