monothematic delusion

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monothematic delusion

An isolated delusion, i.e., a single mistaken but firmly held idea that has no basis in reality.
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First, one barrier to the view that delusions are a (generic) natural kind is their variable causation: Cotard's and Capgras' and other monothematic delusions seem to be isolated confabulations produced in response to localized neurological damage, while the systematic delusions of schizophrenics have some different source.