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Psychology-sensation part 3

Psychology-sensation part 3 - Problems with color vision...

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September 11, 2008 - Psychology 1101 G Outline –Sensation ****This lecture covers Gleitman Chapter 4 p. 144-152 Lateral inhibition and mach bands Transduction and photopigments Photopigments – chemicals in photoreceptors that change their chemical state when exposed to light This bleaching creates a chemical chain reaction that results in a neural impulse Photopigments regenerate over time Rhodopsin in rods Cones use 3 different types Dark adaptation Rod-cone break – rods are more sensitive than cones. Visual receptor cells and change Trichromatic theory of color vision Young (1802) & then Helmholtz -Primary colors suggest three distinct receptors Cone types -S, M, L cones (=Blue, Green, Red cones) -Photopigments (short(blue), medium(green), long(red) cones) 1
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Opponent process theory Hering Two stage process -3 cones system at retina -3 opponent processes higher up -white-black -blue-yellow -red-green Ganglion + LGN (lateral geniculate nucleus) cells have opponent processes / center-surround with colors
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Unformatted text preview: Problems with color vision Monochromatism-Only one cone-True color blindness – only shades of light/dark Dichromatism-Protanopia-Lack L (red) cone-Deuteranopia-Lack M (green) cone-Both protanopes & deuteranopes confuse red & green-Tritanopia-Lack S (blue) cone-Sees only reds & greens-Confuse shades of yellows grays blues Hubel & Wiesel and feature detectors Demos, etc. 2 Blind spot demo: Cover your right eye and focus On the + with your left eye. Move the page closer to your face (~12 inches or so) until the circle disappears. You’ve found your blind spot. The circle image is falling upon the optic disk where the optic nerve exits the retina. You have no receptor cells in that spot on the retina, so the brain fills in the surrounding pattern as its best guess about what should be there. Test: 50 multiple choice questions what has been covered in lectures. It will be difficult. Bring a pencil. 3...
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