U of U PSY 3120 - Color Vision (5 pages)

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Color Vision



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Color Vision

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Pages:
5
School:
University of Utah
Course:
Psy 3120 - Cognitive Psychology

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Color is an Experience An Important Experience Color Vision The Colorblind Painter Functions January 30 2001 And please let Mom Dad Rex Ginger Tucker me and all of the rest of the family see color Three Dimensions Isaac Newton s Experiment Hue Associated with color names Saturation Inversely related to the amount of white 100 50 Brightness Appearance of how light or dark Spectral Basic Colors Non spectral colors Those colors that can only be experienced when 2 or more wavelengths are combined some purples browns Page 1 Color Mixing Color and Wavelength Additive Light Light Subtractive Paint Paint Predicting Additive Mixtures Predicting Additive Mixtures Predicting Additive Mixtures Color Mixing We can see the same color when presented with a single wavelength or a mix of two There are colors that we can only see by mixing Combine 2 complementary lights and get white Page 2 How Does Color Vision Work How Does Color Vision Work Light Rods outnumber cones 20 to 1 very sensitive to light distributed throughout retina none in fovea Ganglion cells Amacrine cell Retina Cones Color Bipolar cells only effective in bright illumination 3 kinds of photopigments fovea and periphery Horizontal cell Optic Nerve Photoreceptors How Does Color Vision Work How Does Color Vision Work Two theories that complement each other Young Helmholtz Trichromatic Theory Cones color vision 3 Types of cones All cones are active but to different levels Young Helmholtz Trichromatic Theory Opponent Process Theory 3 Types of Cones S For Example Blue M L High activity in Blue Minimal in Green Minimal in Red Purple High activity in Blue Minimal in Green High in Red Page 3 How Does Color Vision Work How Does Color Vision Work Imagine colors Red Yellowish red Greenish red How Does Color Vision Work Color Deficiencies Retinal Level Opponent Process Theory Monochromatism Three mechanisms Dichromatism B R B W G Y Color Deficiencies Retinal Level Color Deficiencies Retinal Level Dichromatism Monochromatism More



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