Conditional Multichromacy


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Organisms with Duplex Retinas generally have two independent visual systems:

  • Scotopic Visual System – utilizing Rods and operating in low light
  • Photopic Visual System – utilizing Cones and operating in bright light

However, in Mesopic “twilight” conditions, these two systems can be simultaneously active and even interact with eachother. In this case, the Scotopic system can add another dimension to the organism’s color vision.

Proven instances of Conditional Multichromacy in humans includes:

  • Blue Cone Monochromats, who normally perceive no color, can see some color in Mesopic light.
  • Most Color Normals (Trichromats) have a thin Tetrachromatic color Gamut in Mesopic light.