Galton's definition of hallucinations and illusions
   In 1883 the British scientist Sir Francis Galton (1822-1911) defined hallucinations and illusions as follows: "Hallucinations are defined as appearances wholly due to fancy; illusions, as fanciful perceptions of objects actually seen."
   References
   Galton, F. (1883). Inquiries into human faculty and its development. London: J.M. Dent & Sons.

Dictionary of Hallucinations. . 2010.

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