Capgras' syndrome-an impostor in the family?!

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Today i have educated myself on another disorder - the capgras' syndrome!!..and what's unique about this disorder??..the patient has a feeling that his relatives/close friends are being replaced by someone else who is identical to the original.. There's a difference between this disease and what's called as paranoia..paranoid people have a feeling that 'there are people out there to get them' whereas people affected by the capgras' syndrome have no explanation as to why their close ones are being replaced by their identicals!!.. Sometimes, they feel that they themselves are being replaced by their identical..its a terrible feeling!!.. A woman affected by this syndrome claimed that she had 80 husbands and another case accused that there was her identical trying to get her husband!!..There are many more cases..Besides people, the victims feel sometimes their pets and possessions are also being replaced by their identicals..blimey!.. There's no clue as to what causes this disease..and there are evidences of schizophrenic traces in people affected by this disease..In some cases, brain damage has led to this disease.. So, do u people know anyone who is affected by this disease!!..Or do you have any more information or evidence regardng this??..I would like to know more about this!!