8-Color-6 - Purpose of Color Vision? Perceptual Segregation...

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1 Color Vision Purpose of Color Vision? Perceptual Segregation -- to separate objects from each other or from a background. Color Vision--Outline I. Three Perceptual Dimensions of Color: II. Color and Wavelength: III. Color Mixing: additive and subtractive IV. Two Theories of Color Vision: A. Trichromatic Theory B. Opponent process Theory Color vision defined • Color vision is the ability to discriminate between different wavelengths of light when no brightness cues are present • “Color” is a psychological construct. Physical stimuli may differ in wavelengths they reflect, but those wavelengths have no intrinsic hue. Examples--Do you see the numbers? Color vision defined • Color vision is the ability to discriminate between different wavelengths of light when no brightness cues are present • “Color” is a psychological construct. Physical stimuli may differ in wavelengths they reflect, but those wavelengths have no intrinsic hue.
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2 Physical vs. Psychological (Perceptual) attributes of visual stimuli • Wavelength • Amplitude •P u r i t y • Hue (color) •B r i g h t n e s s • Saturation W1 W2 A1 A2 95% 40% Note: white light can be broken into it’s constituent wavelengths of light with a prism Color Vision--Outline I. Three Perceptual Dimensions of Color: II.
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This note was uploaded on 04/27/2008 for the course PSYCH 201 taught by Professor Sereno during the Spring '07 term at University of Oregon.

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8-Color-6 - Purpose of Color Vision? Perceptual Segregation...

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