• Jan Dirk Blom


In 1911 the German psychiatrist and neurologist Georg Theodor Ziehen (1862–1950) defined hallucinations as follows: “A hallucination is a sense perception without an external stimulus.”


Visual Hallucination Visual Illusion Motor Phenomenon Specific Body Part Charles Bonnet Syndrome 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Jan Dirk Blom
    • 1
  1. 1.Parnassia Bavo Group & University of GroningenThe HagueThe Netherlands

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