- 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."ReferencesGalton, F. (1883). Inquiries into human faculty and its development. London: J.M. Dent & Sons.
Dictionary of Hallucinations. J.D. Blom. 2010.