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Neon color spreading (also referred to as neon-like color spreading) is an optical illusion characterized by fluid borders between the edges of a colored object and the background in the presence of black lines. The illusion was first documented in 1971 and was eventually rediscovered in 1975 by Van Tuijl. "Neon" references a neon tube and the bright colors that appear within one. "Color spreading" references how the colors seem to spread out from the center of the colored portion of the object. Neon color spreading is similar to the watercolor illusion, though the two are not to be confused with one another as they are produced in different ways. ==Causes== The exact causes of the neon color spreading illusion are not known. It seems to occur most often when black lines are substituted with colored lines on a white background. One theory as to why this happens is that the simultaneous stimulation between the visual processing of lines and the color receptors in the eyes are not congruent. For this reasoning to work neon effects would only be possible if all black lines and colored lines were in contact, however there are illusions where this is not the case. Another theory about the illusion is that it occurs due to aberrations of perceptual mechanisms. If this were the case, the effect would not require such specific conditions to occur and would often be perceived when viewing colors under normal conditions.〔 This reasoning works to discount chromatic aberration as the cause. Other theories about reasons for the effect have proposed that it occurs within non-random patterns. Others state that it is necessary for there to be straight lines for the effect to occur. This is not the case as many neon effects happen within random patterns and on curved lines. Neon color spreading is not an effect that usually occurs naturally. It is speculated that the effect occurs due to failings in visual processing. Since human beings would never see the effect naturally, there would be no reason to evolve in such a way that the trait disappears. Some studies theorize that the factors that make up the effect occur within the primary visual cortex and the V2 visual area where image contours are enhanced. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Neon color spreading」の詳細全文を読む スポンサード リンク
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