Color vision demonstrations

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• Color vision demonstrations
• Psych 107
• Professor Jack Loomis
• UCSB

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Spectrum
400 500
600
700
Wavelength (nm)
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Additive color mixture

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Hue circle and desaturated colors
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Following slides demonstrate simultaneous color
contrastObserve that central patch of
achromatic light can take on the complementary
hue of the surround
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Complementary afterimages fixate dot and
alternate with next slide
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Hue circle
700
595
extraspectral hues
575
0
560
400
530
475
505
490
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Opponent axes
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Following slides illustrate dark colorsFor
best results, view in a completely dark
roomNotice that presence of surround stimulus
alters the appearance of central patches(e.g,
orange becomes brown)
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Metallic colors
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Color constancy
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