- Leubuscher's definition of hallucinations
- In 1852 the German psychiatrist Rudolf Leubuscher (1822-1861) defined hallucinations as follows: "Hallucinations are those sense perceptions that come into being without the cooperation ofexternal objects."ReferencesLeubuscher, R. (1852). Über die Entstehung der Sinnestäuschung. Ein Beitrag zur Anthropologie. Berlin: Ferd. Dümmler's Verlagsbuchhandlung.
Dictionary of Hallucinations. J.D. Blom. 2010.