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Lecture 13

PSYC 212 Lecture 13: Chapter 5 – lecture 13

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PSYC 212
Mathieu Roy

Chapter 5 – lecture 13  Steps of color perception o Detection: wavelengths of light must be detected in the first place o Discrimination: tell the difference btwn one wavelength/mixture of wavelengths and another o Appearance: assign perceived colors to lights and surfaces, stable regardless of lighting conditions  Color detection: o Cone photoreceptors  S-cones: short wavelengths, blue  M-cones: medium, green  L-cones: long, red o Photopic: light intensities bright enough to stimulate cone receptors, saturate rod receptors to max response  Sunlight, bright indoor lighting o Scotopic: stimulate rods, but not enough for cones  Moonlight, dim indoor lighting  Discrimination o Single photoreceptor shows different responses to lights of dif wavelengths but same intersity o Principle of univariance: infinite sets of dif wavelength intensity combinations can elicit exactly the same response from a single type of photoreceptor  One type of photoreceptor can’t make color discriminations based on wavelength  3 cone types  tell the dif btwn lights of dif wavelengths o Color-anomalous (color-blind): most can still make discriminations based on wavelength, just dif from norm  deuteranope: absence of m-cones  protanope: absence of l-cones  tritanope: absence of s-cones  cone monochrome: only one cone type- truly color blind o Qualia: private conscious experience of sensation and perception – quality of perception – “the redness of the color red”  Inverted qualia: John Locke – what if violet produced in man’s mind by his eyes, were the same that a marigold produces in another man’s  Mary’s room thought experiment: has only seen black & white, learns everything about science of color perception, sees color for the first time – is it new knowledge?  Yes, qualia is something real even though it is subjective o Rods  Sensitive to scotopic light levels, rhodopsin, same senisitiviy to dif wavelengthsdon’t see color  Trichromacy: theory that color of any light is defined in our visual system by the relationships of 3 numbers, the outputs of 3 receptor types (cones)  Thomas Young & Hermann von Helmholtz o Metamers: dif mixtures of wavelengths that look the same, any pair of stimuli that are perceived as identical even though physically dif  Usually don’t see pure wavelengths, mis red and green wavelengths will look
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