| afterimage | Continuation of visual impression after cessation of stimuli causing the original image. (12 Dec 1998) |
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| positive afterimage | An afterimage in which the lightness relationship is the same as the original one; if chromatic, it appears in the same colour. (05 Mar 2000) |
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| negative afterimage | An afterimage in which the lightness relationship is reversed; if chromatic, it appears in complementary colour. (05 Mar 2000) |