Biopsych - Visual system II Overview Color perception

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Unformatted text preview: Visual system II Overview Color perception Retina-geniculate-striate pathway Different types of cells on/off cells simple cells complex cells Analysis of visual information e.g., shape detection movement Discrimination among colors depend upon the combination of responses by different neurons. Two major interpretations of color vision include the following: 1. Trichromatic theory/Young-Helmholtz theory. 2. Opponent-process theory. Color perception Trichromatic theory Color perception occurs through the relative rates of response by three kinds of cones. Each cone is maximally sensitive to a different set of wavelengths. The ratio of activity across the three types of cones determines the color. Negative afterimage Adaptation in the rate of firing of retinal ganglion cells (rebound effect) Opponent Process Theory 3 types of cells Red-green cells Yellow-blue cells Brightness coding cells A possible mechanism for the theory is that bipolar cells are excited by one set of wavelengths and inhibited by another. We perceive color in terms of paired opposites. Retina-geniculate-striate pathway Retina lateral geniculate nucleus (thalamus) striate cortex (primary visual cortex) Optic chiasm Optic nerve Optic tract Left visual field Right visual field Lateral Geniculate Nucleus (LGN) forms P pathways forms M pathways OUTER Parvocellular...
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Biopsych - Visual system II Overview Color perception

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