corona phenomenon

corona phenomenon
   The term corona phenomenon is indebted to the Latin noun corona, which means crown. It was introduced in or shortly before 1966 by the Danish neuroscientists Axel Klee (1933-1982?) and Rolf Willanger to denote a *visual illusion consisting of an extra edge perceived around objects. The phenomenon itself has been described before, however, andreferredtobysuchtermsas* halo, border, and shiny ring. The German ophthalmologist Christian Georg Theodor Ruete (18101867) has been credited with providing the first written account of a corona phenomenon avant la lettre in 1845. Corona phenomena typically present in the form of a single or a double contour. They can surround objects in whole or in part, can be executed in any type of colour, including black and white, and may take on a shining, silvery, or shimmering quality. They may occur in isolation, or in association with an incomplete loss of vision (i.e. a *scotoma), a * scintillating scotoma, or a complete * hemianopia. In addition, they may be accompanied by * geometric hallucinations. Atypical corona phenomena have been described as well, presenting in the form of multiple coloured edges, multiple waves and zigzag lines, coronas surrounding illusory images, or combinations of corona phenomena and other illusory or hallucinatory phenomena such as *mosaic vision, *autoscopy, *polyopia, *teleopsia, and *micropsia. Etiologically, corona phenomena are associated primarily with * migraine aura and with * sensory deprivation. Their pathophysiology is basically unknown, but it has been suggested that they may be mediated by CNS structures involved in visual contrast perception. The corona phenomenon should not be confused with the corona of light associated with * Buddha's halo, with * heiligenschein, with the * visual halo (also known as corona), and with the * aura featuring in the paranormal literature.
   References
   Klee, A., Willanger, R. (1966). Disturbances of visual perception in migraine. Acta Neurolog-ica Scandinavica, 42, 400-414.
   Podoll, K., Robinson, D. (2001). Corona phenomenon as visual aura symptom in migraine. Cephalalgia, 21, 712-717.
   Ruete, C.G.T. (1845). Lehrbuch der Ophthalmologie für Aerzte und Studirende. Braunschweig: F. Vieweg und Sohn.

Dictionary of Hallucinations. . 2010.

Игры ⚽ Нужен реферат?

Look at other dictionaries:

  • Corona (disambiguation) — Contents 1 Astronomy and space science 2 Biology 3 Mathematics 4 …   Wikipedia

  • Corona (optical phenomenon) — For other uses, see Corona (disambiguation). A lunar corona …   Wikipedia

  • Glory (optical phenomenon) — A glory is an optical phenomenon appearing much like an iconic Saint s halo about the head of the observer which is produced by light backscattered (a combination of diffraction, reflection and refraction) towards its source by a cloud of… …   Wikipedia

  • Halo (optical phenomenon) — A halo (unicode|ἅλως; also known as a nimbus, icebow or Gloriole) is an optical phenomenon that appears near or around the Sun or Moon, and sometimes near other strong light sources such as street lights. There are many types of optical halos,… …   Wikipedia

  • halo —    Also known as optical halo and corona. The term halo comes from the Greek noun halos,which means area. In meteorology and physics the terms halo, optical halo, and corona are used to denote a * physical illusion consisting of a luminous or… …   Dictionary of Hallucinations

  • metamorphopsia —    The term metamorphopsia comes from the Greek words metamorphoun (to change the form) and opsis (seeing). It translates roughly as seeing an altered form . It is not clear who introduced the term, but it appears in a medical lexicon as early as …   Dictionary of Hallucinations

  • border —    see corona phenomenon …   Dictionary of Hallucinations

  • shiny ring —    see corona phenomenon …   Dictionary of Hallucinations

  • visual halo —    Also referred to as halo and halo vision. All three terms are indebted to the Greek noun halos, which means area. In biomedicine the terms halo and visual halo are used to denote a luminous or coloured circle surrounding visually perceived… …   Dictionary of Hallucinations

  • eclipse — eclipser, n. /i klips /, n., v., eclipsed, eclipsing. n. 1. Astron. a. the obscuration of the light of the moon by the intervention of the earth between it and the sun (lunar eclipse) or the obscuration of the light of the sun by the intervention …   Universalium

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”