A delusions in psychiatry and psychology are called...
mistaken beliefs that are held with strong conviction
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visual hallucinations
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convulsions caused by emotional reactions
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A delusion is a mistaken belief that is held with strong conviction even in the presence of superior evidence to the contrary. As a pathology, it is distinct from a belief based on false or incomplete information, confabulation, dogma, illusion, or some other misleading effects of perception.