sully's definition of illusions
   In 1881 the British psychologist James Sully (1842-1923) defined an *illusion as "any species of error which counterfeits the form of immediate, self-evident, or intuitive knowledge, whether as sense perception or otherwise. Whenever a thing is believed on its own evidence and not as a conclusion from something else, and the thing then believed is demonstrably wrong, there is an illusion. The term would thus appear to cover all varieties of error which are not recognized as fallacies or false inferences."
   References
   Sully, J. (1881). Illusions: A psychological study. New York, NY: Humboldt Publishing Company.

Dictionary of Hallucinations. . 2010.

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