Glossary of Chapter 5 The Perception of Color

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What is the principle of univariance?
wavelengths can have same neural response making it hard to discriminate between them
What is scoptopic?
dim light levels
What is photopic?
bright day light levels
What is mesotopic?
dust and dawn
What is protanopia?
no L cones;colorblindness
What is deuteranopia?
No M cones;colorblindness
What is tritanopia?
No S cones;colorblindness
What are metamers?
different wavelengths perceived as same color
What is trichromacy?
theory that color of any light is defined in our visual system by the relationship between a set of three cones
What is L-M?
red - green
What is S - (L+M)?
What is L + M?
What is additive color mixture?
mixture of lights
What is subtractive color mixture?
a mixture of pigments
What is hue?
the chromatic aspect of color
What is saturation?
the chromatic strength of a hue
What is brightness?
the distance from black in color space
What is color space?
3-d space, established because color perception is based on the outputs of three cone types, that describes the set of all colors
What is the opponent color theory?
theory that perception of color is based on the output of three mechanisms, each of them on an opponency between 2 colors
What is achromatopsia?
inability to perceive colors that is due to damage to central nervous system
What is agnosia?
inability to recognize objects in spite of the ability to see them`
What is anomia?
inability to name objects in spite of the ability to see and recognize them
What is color constancy?
the tendency of a surface to appear the same color under a fairly wide range of illuminants

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