blindness and hallucinations
- Visual hallucinations occurring in individuals with impaired vision have been reported since ancient times. Perhaps the best-known historical example is the description of Charles Lullin's * visual hallucinations, as rendered by his grandson Charles Bonnet (1720-1792), and thereafter commonly referred to as the * Charles Bonnet syndrome. Visual hallucinations are also known to occur, albeit less frequently, in partial visual field defects such as * hemianopia (resulting in so-called * hemianopic hallucinations), *quadrantanopsia, central scotoma, and *amblyopia. See also the entries Ictal blindness, Hypnotic blindness, Hysterical blindness, Change blindness, Inattentional blindness, and Negative hallucination.ReferencesFreiman, Th.M., Surges, R., Vougioukas, V.I., Hubbe, U., Talazko, J., Zentner, J., Honeg-ger, J., Schulze-Bonhage, A. (2004). Complex visual hallucinations (Charles Bonnet syndrome) in visual field defects following cerebral surgery. Report of four cases. Journal of Neurosurgery, 101, 846-853.
Dictionary of Hallucinations. J.D. Blom. 2010.
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ictal blindness and hallucinations — The term ictal blindness is indebted to the Latin noun ictus, which means blow or thrust. In neurology the term ictus denotes a paroxysmal epileptic seizure. The term ictal blindness refers to a rare amaurotic state occurring in the context of … Dictionary of Hallucinations
anosognosia and hallucinations — The term anosognosia comes from the Greek words a (not), nosos (illness), and gnosis (insight). It translates loosely as lack of knowledge of one s illness . The French neologism anosog nosie was introduced in or shortly before 1914 by the… … Dictionary of Hallucinations
quadrantanopsia and hallucinations — The term quadrantanopsia comes from the Latin noun quadrans (the quarter part of a circle), and the Greek words an (not) and opsis (seeing). It translates as blindness within a quarter of the field of vision . Quadrantanopsia is attributed… … Dictionary of Hallucinations
Leber's Congenital Amaurosis (LCA) and hallucinations — The eponym Leber s congenital amaurosis refers to the German ophthalmologist Theodor Karl Gustav von Leber (1840 1917), who was the first to describe the concomitant condition in 1869. LCA is considered a type of amaurosis, due to an autosomal … Dictionary of Hallucinations
hysterical blindness — Also known as conversive blindness. The term hysterical blindness is indebted to the term hysteria, which is in turn indebted to the Greek noun hustera (uterus). The term hysteria reflects the ancient conviction that some types of mental… … Dictionary of Hallucinations
hypnotic blindness — The term hypnotic blindness refers to the notion of hypnosis, which is in turn indebted to the Greek noun hupnos (sleep). It is used to denote a hypnotically induced failure to consciously perceive an object or stimulus which is present in the … Dictionary of Hallucinations
inattentional blindness — The term inattentional blindness is indebted to the Latin words in (not) and attentio (attention, notice). It was introduced in or shortly before 1992 by the American psychologists Arien Mack (b. 1931) and Irvin Rock (1922 1995). It is used to … Dictionary of Hallucinations
change blindness — A term used since the 1970s to refer to the relatively poor ability of humans to detect large changes to a visually perceived object or scene. Experiments making use of manipulated photographs, motion pictures, live interactions, and other… … Dictionary of Hallucinations
amaurosis fugax and visual hallucinations — The noun amaurosis is Greek for darkening or loss of vision; the adjective fugax comes from the Latin noun fuga, or flight. The term amau rosis fugax translates loosely as transient blindness. It is used to denote a sudden, painless, temporary … Dictionary of Hallucinations
colour blindness — The term colour blindness was introduced in or shortly before 1844 by the Scottish physicist and homo universalis David Brewster (1781 1868) as an alternative for the expression * Daltonism. Brewster s proposal for this new name was inspired… … Dictionary of Hallucinations