Your brain invents colors you can't see

that tricky magenta? it's only in your mind, not out there in the light

By Smartasaurus· 1 min read Curious

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The short version

that tricky magenta? it's only in your mind, not out there in the light
This absence of green, coupled with the red and blue signals, is not a wavelength in itself.
Color blindness affecting red-green perception can alter the experience of magenta.

A prism splits white light into a familiar spectrum: red, orange, yellow, green, blue, indigo, violet. Observe these pure colors, each a distinct wavelength, flowing seamlessly from one to the next. Nowhere in this ordered progression does one find magenta.

Yet, we perceive magenta with unwavering clarity. It exists in vibrant fuchsias, deep purples, and the rich hues of a sunset. This color, so vividly displayed, is conspicuously absent from the physical rainbow.

Our eyes possess three types of cone cells, sensitive to red, green, and blue light. When these cones are stimulated by light waves of various lengths, the brain interprets the combined signals as color. Magenta emerges when our brain processes a unique opposition: strong excitation of the red cones, moderate excitation of the blue cones, and a distinct *lack* of green light stimulation.

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