PSY-3215 Lecture Notes - Lecture 14: Opponent Process, Ewald Hering, Afterimage
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Perception
FALL SEMESTER 2016
Dr. Kenneth Steele
steelekm@appstate.edu
September 26, 2016
Hermann von Helmholtz’s Color Mixing Experiments
● What is the minimum number of primaries we need in a mixing system to be able to reproduce all
colors?
○ The answer is 3
● Is there a special set of primaries that will only work?
○ The answer is no - there are all kinds of primaries that will work
○ The exception: one of the primaries cannot be a metamer of the other two
○ Red, green, and yellow would not work because red and green makes yellow
●Trichromatic theory: there are three wavelength detectors
○ Colors are a mix of the activation of the three detectors
Ewald Hering
● People tend to organize colors by four primaries
○ Red, green, blue, and yellow
● When asking people to imagine a mix of colors, some mixes were easier to imagine than others
○ Red and yellow making orange is an easy mix
○ Red and green making yellow isn’t as easy
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