Hallucinations: Etiology and clinical implications

Ind Psychiatry J. 2009 Jul;18(2):119-26. doi: 10.4103/0972-6748.62273.


The literature on hallucinations is reviewed, including history; theoretical background from physiological, biochemical and psychological points of view; classification; causation; presentation in different psychiatric and neurological disorders and in normal persons. The available evidence suggests that hallucinations result from a failure of the metacognitive skills involved in discriminating between self-generated and external sources of information. Management of hallucinations is briefly discussed.

Keywords: Etiology; Hallucinations; Psychopathology.