Aktion 23 Fnorum

Wikipedia hat geschrieben:A chimerical color is an imaginary color that can be seen temporarily by looking steadily at a strong color for a while until some of the cone cells become fatigued, temporarily changing their color sensitivities, and then looking at a markedly different color. They are explained by the opponent process color theory. For example, staring at a saturated primary-color field then looking at a white object results in an opposing shift in hue, causing an afterimage of the complementary colors. Exploration of the color space outside the range of "real colors" by this means is major corroborating evidence for the opponent process theory of color vision. Chimerical colors can be seen while seeing with one eye or with both eyes, and are not observed to reproduce simultaneously qualities of opposing colors (e.g. "yellowish blue"). Chimerical colors include:

• Stygian colors: these are simultaneously dark and impossibly saturated. For example, to see "stygian blue": staring at bright yellow causes a dark blue afterimage, then on looking at black, the blue is seen as blue against the black, but due to lack of the usual brightness contrast it seems to be as dark as the black. The eye retina contains some neurons that fire only in the dark.
• Self-luminous colors: these mimic the effect of a glowing material, even when viewed on a medium such as paper, which can only reflect and not emit its own light. For example, to see "self-luminous red": staring at green causes a red afterimage, then on looking at white, the red is seen against the white and may seem to be brighter than the white.
• Hyperbolic colors: these are impossibly highly saturated. For example, to see "hyperbolic orange": staring at bright cyan causes an orange afterimage, then on looking at orange, the resulting orange afterimage seen against the orange background may cause an orange color purer than the purest orange color that can be made by any normally-seen light. Or, staring at something pure magenta in bright sunlight for two minutes or more, and then looking at green leaves, may result in briefly seeing an unnaturally pure green afterimage.

Bwana Honolulu hat geschrieben:Ich hab' auch mal ein Experiment gesehen, wo sie bei 'nem dichromatischen Affen (der aus unserer Sicht rot-grün-blind wäre) ein zusätzliches Opsin ins Auge eingeführt haben, woraufhin der Affe dann nachträglich die Fähigkeit entwickelt hat, rot und grün zu unterscheiden. Stell' dir vor, wir könnten uns selbst einfach ein viertes, fünftes, x-tes Opsin ins Auge jagen und damit den Wahrnehmungsbereich unseres Auges im Nachhinein noch massiv erweitern...

Wikipedia (en) hat geschrieben:The McCollough effect is a phenomenon of human visual perception in which colorless gratings appear colored contingent on the orientation of the gratings. It is an aftereffect requiring a period of induction to produce it. For example, if someone alternately looks at a red horizontal grating and a green vertical grating for a few minutes, a black-and-white horizontal grating will then look greenish and a black-and-white vertical grating will then look pinkish. The effect is remarkable because, although it diminishes rapidly with repeated testing, it has been reported to last up to 2.8 months when exposure to testing is limited.