visual snow
   Also known as aeropsia. Both terms refer to a * simple visual hallucination depicting televisionlike static. Visual snow may be either transient or permanent, and it may affect either the whole visual field, or one or more parts of it. In conformity with the * dimensions of visual imagery devised by the American psychopharmacologists Ronald K. Siegel and Murray E. Jarvik, visual snow can also be designated as a visual hallucination of a random form dimension. As is the case with * photopsia and other simple visual hallucinations, visual snow may be mediated either peripherally or centrally. It has been described in association with numerous conditions, including intoxication with * hallucinogens such as LSD and mescaline, in * hallucinogen-induced persistent perception disorder (HPPD), and as a complication of migraine with aura called *persistent aura without infarction.
   References
   Siegel, R.K., Jarvik, M.E. (1975). Drug-induced hallucinations in animals and man.In: Hallucinations. Behavior, experience, and theory. Edited by Siegel, R.K., West, L.J. New York, NY: John Wiley & Sons.

Dictionary of Hallucinations. . 2010.

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