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BRAIN, COLOR FREQUENCY DETECTION

Text: LONDON (Reuters) -- Scientists have discovered how the brain perceives color in a finding that could one day help people who have lost their sight. By studying macaque monkeys, researchers at the University Texas-Houston Medical School have shown how modules of cells called "thin stripes" in a particular region of the brain are arranged and perceive colors. "This finding provides the first physiological basis for the perception of the full gamut of color," said Daniel Felleman, a professor of neurobiology and anatomy. Felleman and his team mapped changes in blood flow along the stripes in the brains of the monkeys while showing them a series of colors. Their findings are reported in the science journal Nature. While the monkeys looked at different colors, the blood flow peaks in their brains shifted systematically in specific portions of the stripes. An area with a peak flow for red was next to the portion that peaked for orange, then yellow, and other colors. "We believe that the brain uses a spatial code for color such that the location of the peak activity within these color maps determines the color that you see," Felleman added in a statement. Although the research was done in macaques, the scientists believe mechanisms in the human brain would work in a similar way and that the knowledge could be used to develop devices to help the blind. "You always hope that knowing the basic mechanisms of brain coding and perceptual processing would allow you to some day have a prosthetic aid that would activate the brain in the same way that the eye normally does," Felleman added. http://www.cnn.com/2003/TECH/science/01/30/color.perception.reut/index.html

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