Editing Hallucination (section)

===Experimentally-induced hallucinations===
{{Main|Hallucinations in the sane}}
'''Anomalous experiences''', such as so-called benign hallucinations, may occur in a person in a state of good mental and physical health, even in the apparent absence of a transient trigger factor such as [[fatigue (medical)|fatigue]], [[Substance intoxication|intoxication]] or [[sensory deprivation]].

The evidence for this statement has been accumulating for more than a century. Studies of benign hallucinatory experiences go back to 1886 and the early work of the [[Society for Psychical Research]],<ref>{{cite book | vauthors = Gurney E, Myers FW, Podmore F | date = 1886 | title = Phantasms of the Living, Vols. I and II | location = London | publisher = Trubner and Co. }}</ref><ref>{{cite journal | vauthors = Sidgwick E, Johnson A, etal | date = 1894 | title = Report on the Census of Hallucinations | location =  London | journal = Proceedings of the Society for Psychical Research | volume = X }}</ref> which suggested approximately 10% of the population had experienced at least one hallucinatory episode in the course of their life. More recent studies have validated these findings; the precise incidence found varies with the nature of the episode and the criteria of "hallucination" adopted, but the basic finding is now well-supported.<ref>{{cite book | vauthors = Slade PD, Bentall RP | date = 1988 | title = Sensory Deception: a scientific analysis of hallucination | location = London | publisher = Croom Helm }}</ref>