Persistent belief in a demonstrable untruth or a provably inaccurate perception, despite clear evidence to the contrary, is

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Persistent belief in a demonstrable untruth is a classic example of a delusion, which is a false belief that is firmly held despite clear evidence to the contrary. Hallucinations involve perceiving things that are not actually present, while illusions involve misperceiving or misinterpreting stimuli that are present in the environment. Confabulation is the production of fabricated or distorted memories without the intention to deceive.

Persistent Belief in a Demonstrable Untruth or a Provably Inaccurate