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Pulfrich effect
The Pulfrich effect is a psychophysical percept wherein lateral motion of an object in the field of view is interpreted by the visual cortex as having a depth component, due to a relative difference in signal timings between the two eyes.
==Overview==
The effect is generally induced by placing a dark filter over one eye but can also occur spontaneously in several eye diseases such as cataract,〔Scotcher SM, Laidlaw DA, Canning CR, Weal MJ, Harrad RA.: ''Pulfrich's phenomenon in unilateral cataract.'', ''Br J Ophthalmol.'', 81(12):1050-5〕 optic neuritis,〔Slagsvold JE: ''Pulfrich pendulum phenomenon in patients with a history of acute optic neuritis.'', ''Acta Ophthalmol (Copenh)'', 6(5):817-26〕〔Burde RM, Gallin PF: ''Visual parameters associated with recovered retrobulbar optic neuritis.'', ''Am J Ophthalmol.'', 79(6):1034-7〕 or multiple sclerosis.〔Rushton D: ''Use of the Pulfrich pendulum for detecting abnormal delay in the visual pathway in multiple sclerosis.'', ''Brain'', 98(2):283-96〕 In such cases, symptoms such as difficulties judging the paths of oncoming cars have been reported. The phenomenon is named for German physicist Carl Pulfrich, who first described it in 1922.〔http://pulfrich.siu.edu/Pulfrich_Pages/lit_pulf/1922_Pulfrich.htm〕 The effect has been exploited as the basis for some television, film, and game 3D presentations.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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