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  2. Synesthesia - Wikipedia

    en.wikipedia.org/wiki/Synesthesia

    Perhaps "hearing" is not quite accurate, since the color sensations seem to be produced by the very act of my orally forming a given letter while I imagine its outline. The long a of the English alphabet (and it is this alphabet I have in mind farther on unless otherwise stated) has for me the tint of weathered wood, but the French a evokes ...

  3. Impossible color - Wikipedia

    en.wikipedia.org/wiki/Impossible_color

    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"). [7]

  4. Eye color - Wikipedia

    en.wikipedia.org/wiki/Eye_color

    The total number of genes that contribute to eye color is unknown, but there are a few likely candidates. A study in Rotterdam (2009) found that it was possible to predict eye color with more than 90% accuracy for brown and blue using just six SNPs. [16] [17] In humans, eye color is a highly sexually dimorphic trait. [18]

  5. Chromesthesia - Wikipedia

    en.wikipedia.org/wiki/Chromesthesia

    A keyboard depicting note-color associations. The colors are experienced with the sounding of the note, and are not necessarily localized to piano keys. Chromesthesia or sound-to-color synesthesia is a type of synesthesia in which sound involuntarily evokes an experience of color, shape, and movement.

  6. Color vision - Wikipedia

    en.wikipedia.org/wiki/Color_vision

    Color vision is categorized foremost according to the dimensionality of the color gamut, which is defined by the number of primaries required to represent the color vision. This is generally equal to the number of photopsins expressed: a correlation that holds for vertebrates but not invertebrates .

  7. Young–Helmholtz theory - Wikipedia

    en.wikipedia.org/wiki/Young–Helmholtz_theory

    Thomas Young and Hermann von Helmholtz assumed that the eye's retina consists of three different kinds of light receptors for red, green and blue.. The Young–Helmholtz theory (based on the work of Thomas Young and Hermann von Helmholtz in the 19th century), also known as the trichromatic theory, is a theory of trichromatic color vision – the manner in which the visual system gives rise to ...

  8. Optics and vision - Wikipedia

    en.wikipedia.org/wiki/Optics_and_vision

    The human eye is an organ which reacts to light for several purposes. As a conscious sense organ, the eye allows vision. Rod and cone cells in the retina allow conscious light perception and vision including color differentiation and the perception of depth. The human eye can distinguish about 10 million colors.

  9. Eigengrau - Wikipedia

    en.wikipedia.org/wiki/Eigengrau

    Eigengrau (German for "intrinsic gray"; pronounced [ˈʔaɪ̯gŋ̍ˌgʁaʊ̯] ⓘ), also called Eigenlicht (Dutch and German for "intrinsic light"), dark light, or brain gray, is the uniform dark gray background color that many people report seeing in the absence of light.