PSYCH 1XX3 Study Guide - Final Guide: Chromosome, Occipital Lobe, Cytochrome C Oxidase
21 Mar 2017
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Unit 2: evolution of colour vision why and who. Subtractive colour mixing: when coloured pigments selectively absorbs some wavelengths and reflect others, mixing pigments, dyes or paints. Two theories of colour vision: trichromatic theory, proposes that the retina contains three different kinds of cones that are each sensitive to different wavelengths of light, proposed by thomas young in 1802, modified by helmhold in 1866. A red light would stimulate a red cone in the retina which would excite red- green ganglion cells: this excitation of cells would signal the brain that the stimulus is red, ex. Green light would stimulate a green cone and inhibit red-green ganglion cells: this inhibition signals to the brain that the signal is green, ex. Blue stimulus activates blue cone and inhibits blue-yellow ganglion cells signaling that the stimulus is blue: ex. Yellow light is a mixture of red and green, so it causes equal activation of the red and green cones.
