The term plagiopsia comes from the Greek words plagios (tilted) and opsis (seeing). It is used to denote a visual distortion in which objects are perceived as inclined. As a phenomenon, plagiop-sia was described as early as 1933 by the British neurologists Macdonald Critchley (1900-1997) and Fergus Ferguson. It is associated primarily with * aurae occurring in the context of paroxysmal neurological disorders such as migraine and epilepsy, and with the use of * hallucinogenic substances such as LSD and mescaline. It is commonly classified as a *metamorphopsia, which is itself classified as a * sensory distortion. In a conceptual and phenomenological sense, plagiop-sia is closely related to * environmental tilt and * tortopia.
   Critchley, M., Ferguson, F. (1933). Migraine. Lancet, 1, 123-126. Klee, A., Willanger, R. (1966). Disturbances of visual perception in migraine. Acta Neurologica Scandinavica, 42, 400-414. Wieser, H.G. (2000). Temporal lobe epilepsies. In: Handbook of clinical neurology. Volume 73. The epilepsies. Part II. Edited by Vinken, P.J., Bruyn, G.W. Amsterdam: Elsevier Science Publishers.

Dictionary of Hallucinations. . 2010.

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