emminghaus's definition of hallucinations

   In 1878 the German psychiatrist Hermann Emminghaus (1845-1904) defined hallucinations as follows. "Hallucinations are understood as phantasms that do not result from external impressions."

   References

   Emminghaus, H. (1878). Allgemeine Psychopathologie, zur Einführung in das Studium der Geistesstörungen. Leipzig: F.C.W. Vogel.