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Psychology Terms - Abney effect
The subtle alteration in the hue of monochromatic light when its brightness is modified due to the addition of white light. A perceptual phenomenon in which a big surface, when abruptly illuminated, first appears to brighten at its center before its edges, and conversely, when the illumination is suddenly removed, it appears to darken first at its edges and subsequently at its center. [Named in honor of the English scientist and physicist Sir William de Wiveleslie Abney (1843–1920)]
The subtle alteration in the hue of monochromatic light when its brightness is modified due to the addition of white light. A perceptual phenomenon in which a big surface, when abruptly illuminated, first appears to brighten at its center before its edges, and conversely, when the illumination is suddenly removed, it appears to darken first at its edges and subsequently at its center. [Named in honor of the English scientist and physicist Sir William de Wiveleslie Abney (1843–1920)]
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