• Jan Dirk Blom


In 1975 the American anthropologist Raoul Weston La Barre defined hallucinations as follows: “In careful present-day usage, hallucination indicates a false appearance, in sensory form, hence seemingly external, but occasioned by an internal condition of the mind, the central suggestion of the term being its subjectivity and groundlessness.”


Retinitis Pigmentosa Ergot Alkaloid Stereoscopic Vision Formal Thought Disorder Lysergic Acid Diethylamide 

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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