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lec5 - Resesarch Topics in Neuroscience Peter H Schiller...

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Resesarch Topics in Neuroscience Peter H. Schiller, year 2006 Color vision and adaptation
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Central questions about color vision and adaptation: 1. What are the basic facts and laws of color vision? 2. What are the major theories of color vision? 3. How is color processed in the retina and the LGN? 4. How is color processed in the cortex? 5. What is the nature of color blindness? 6. How is adaptation achieved in the visual system? 7. What are afterimages?
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Color vision
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Basic facts and rules of color vision 1. There are three qualities of color: hue, brightness, saturation 2. There is a clear distinction between the physical and psychological attributes of color: wavelength vs. color, luminance vs. brightness. 3. Peak sensitivity of human photoreceptors: S = 420, M = 530, L = 560, Rods = 500 4. Grassman's laws: 1. Every color has a complimentary which when mixed propery yields gray. 2. Mixture of non-complimentary colors yields intermediates. 5. Abney's law: The luminance of a mixture of differently colored lights is equal to the sum of the luminances of the components. 6. Metamers: stimuli producing different distributions of light energy that yield the same color sensations.
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Newton's prism experiment red red orange yellow green blue indigo violet
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red orange yellow green blue indigo violet AC circuits Broadcast band Radar Infrared rays Ultraviolet rays X rays Gamma rays Wavelength in meters Wavelength in Nanometers The visible spectrum 10 8 10 6 10 4 10 2 10 -2 10 -4 10 -6 10 -8 10 -10 10 -12 10 -14 700 600 500 400 1 Figure by MIT OCW.
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The color circle white white Green Red Blue Yellow saturation hue black
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Figure by MIT OCW. Saturation Y B R G Hue
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Major theories of color vision
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Earlier Leonardo da Vinci: "Of different colors equally perfect, that will appear most excellent which is seen near its direct contrary...blue near yellow, green near red: because each color is seen, when opposed to its contrary, than to any other similar to it.
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