Aubanel's definition of hallucinations

   In 1839 the French physician Honoré Aubanel defined hallucinations as follows: "The hallucination is a form or variety of mental illness in which a person transforms delirious mental ideas into sensations, or, using these same ideas, perverts his real sensations by assimilating them with the ideas of his delirium."

   References

   Aubanel, H. (1839). Essai sur les hallucinations. Thèse Université de Paris.