Lec5 - Responses b g r Spectrum b g r Light 1 Light 2 400...

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Perception is an active process, involving “effort after meaning”
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We attribute meaning, even purpose, to moving dots… Heider.Michotte.Mov
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1. Perceiving color Finding fruit Finding mates
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“Blue” cones “Red” cones Relative responsiveness of cones Wavelength (nm) 1.0 0.5 0.0 400 500 600 “Green” cones Rods
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First images of the three kinds of cones in the living human retina Colors used here are just the popular labels for the sensitive range of each kind of cone Actually opposite to the colors reflected by the cones
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perceived color varies with ratio of responses of the three cones 400 500 600 700 1.0 0.5 0.0 Intensity Wavelength Blue Light CONE RESPONSES Blue b g r Tomato Tomato
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Infinite set of possible wavelength distributions Color has only 3 dimensions Human vision measures only 3 values, one for each cone non-invertible: can’t recover the wavelength distribution Cone
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Unformatted text preview: Responses b g r Spectrum b g r Light 1 Light 2 400 500 600 700 1.0 0.5 0.0 Wavelength Yellow LED b g r Receptors 400 500 600 700 1.0 0.5 0.0 Wavelength Yellow (Red+Green) = + b g r Receptors different spectra, same color: a metamer Mystery of brown Other factors: illumination 2. Color blindness Brain injury, cortical color blindness, very rare 1.0 0.5 0.0 400 500 600 Lose r or g cones (1/20 males, 1/400 females) Lose b cones (very rare) Lose two cones (cone monochromat, rare) Lose all cones (rod monochromat, rare, albinism) Color vision tests: read the number Original Lose one kind of cone and your color vision now has only two dimensions red-green -R red-green -G-B What does it look like? Normal red-green (-G)-B Normal red-green (-G) red-green (-R) Normal red-green (-G) John Sadowski John Sadowski...
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This note was uploaded on 04/10/2010 for the course PSYC 1 taught by Professor Stuartantsis during the Spring '08 term at UCSD.

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Lec5 - Responses b g r Spectrum b g r Light 1 Light 2 400...

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