Lecture, Chapter 3, post, part 1

Hue based on wavelength theories of colour vision

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Unformatted text preview: _____________ Theories of Colour Vision What is colour? Hue based on wavelength Theories of Colour Vision Theories Trichromatic theory: colour perception is based on 3 types of receptors, each maximally responsive to different (but overlapping ranges) Is based on the fact that the human eye has 3 different types of cones – Respond to colours in the green, red, & blue wavelengths Trichromatic Theory Normally, there are three kinds of cones (each one sensitive to a specific range of wavelengths): "red" cones "green" cones "blue" cones Trichromatic thoery If you stimulate all 3 types of cones about equally the result is white or no color. Can explain colour blindness… The different kinds of inherited color blindness result from partial or complete loss of function of one or more of the different cone systems. But not afterimages! Opponent Process Theory Hering proposed that visual system treats colours as complementary pairs: – Red-green – Blue-yellow When one colour in opponent pair is stimulated, opponent colour will be inhibited Colour Vision Colour Trichromatic theory: operates in retina Opponent-process theory: operates in ganglion cells & thalamus _______________________________ __________________________ Producing Stable Interpretations – In addition to...
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