Dual-Process Theory |
Theories of Color VisionThere are two common theories about how color vision works. It is now thought that these are not separate theories but complimentary theories that are combined in Dual-Process Theory.
The goal of this lesson is to have a basic understanding of the role cones play in creating color, all theories agree that it is the cone reception of different wavelengths of light. Trichromatic Theory is the older of the two theories, this theory is based on the fact that there are 3 types of cones in the retina. This theory states that all colors can be created by the concentration of light waves sensed by the cones. A video below helps describe this process Opponent Theory suggests that each cone are sensitive to two types of light waves blue-yellow; red-green; and black-white. This theory explains how sensory adaptation in combination with cone sensitivity can create the phenomenon known as an after image. Additional information can be found at this page where the diagram to the left originated from. |
Trichromatic TheoryWatch the following video for additional information about light frequencies and an animation of how the rods and cones influence visual perception.
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Opponent Process TheoryThis video provides a relatively simple explanation of of Opponent Process Theory. There is a much more technical video here which may answer your questions, it may however cause more confusion due to the technical language.
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Simulation Directions
Double click the RGB Bulbs icon in the simulation below. Adjust the sliders to control the amount of color that enters the eyes. The amount of light entering the eye will help the brain create various colors. Open a google doc in another tab to record your answers to the questions posted next to the simulation. (you may use print screen function) Share google doc upon completion.
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Activity/Quiz
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