A delusion, in everyday language, is a fixed belief that is either false, fanciful, or derived from deception. Psychiatry defines the term more specifically as a belief that is pathological (the result of an illness or illness process). As a pathology, it is distinct from a belief based on false or incomplete information, apperception, illusion, or other effects of perception.
Delusions typically occur in the context of neurological or mental ill...
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