What theories contribute to our understanding of color vision? Discuss at least two relevant theories within the field of vision.

What theories contribute to our understanding of color vision? Discuss at least two relevant theories within the field of vision.

The two theories of color vision are known as the trichromatic theory also known as the Young-Helmholtz theory, and the opponent process theory. Both theories compliment one with the other their purpose is to explain the processes which operate at different levels of the visual system. The trichromatic theory was first experimented by you guessed it Young, and Helmholtz, these gentlemen tested out theories where they adjusted the relative intensity of several light sources that were measuring at different lengths. Their findings found that those who had fair or normal color vision needed at least three different wave lengths to the visibility spectrum. This finding is what led to a theory that would be consistent with what is now known as the trichromatic theory. Normal vision would be found to require at least three types of receptors, each of them would all have different kinds of peak sensitivity. These three balance activity cones are short, medium, and long wavelengths this is what determines color perception.

Opponent –process theory developed by a Ewald Hering, his theory links color pairs that have three opposing color pairs; this includes the color blue-yellow, red-green, and black-white. This theory, is based off of its consistency with the fact that two members of one of these pairs need to inhibit one another. However they cannot be paired at the same location, meaning we do not have vision that lets us see colors like bluish yellow or reddish green. Although the opponent process theory explains why there is “yellow”, the inhibitory connection between multiple cone types, even though there is no yellow cone. Excitatory and inhibitory connections are shared between these types of cones, stimulation of red is called L cones, and green M cones, are then summed together and this result is the color yellow or the perception of the color yellow.

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