Jan13_Sensation and Perception

Jan13_Sensation and Perception - 1 Spectrum 2 Cone...

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More than half of the brain is devoted to vision Perception is more like grasping out with your hands, needs an active effort for meaning Meaningless blob to real object Why do we see the world in color – use color vision to find the ripe fruit of the green leaves - Find food, finding mates- eg peacocks, finches Color constancy We see only a strip of the whole spectrum due to the sunlight Fluorescence converts invisible ultraviolet into visible light Cones and Rods, There are three different types of cones – blue cones, red cones, green cones In evolution we first started with blue cones then splited into green and reds. The rods cover the rest. Blue light is fairly broad spectrum, Tomato- Brain: red fires lot of red then less green then less blue Color only has 3 dimensions brain only cares about the firing rate of the three different cones
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Unformatted text preview: 1. Spectrum 2. Cone responses 3 Human vision measures only 3 values, one for each one. Non-invertible: can’t recover the wavelength distribution Metamer-Light primaries: red green blue Yellow: Fires off red and green cones at the same rate White: all cones fired Ink: primaries: yellow, cyan, and magenta Subtractive Mixing/ Additive Mixing What does a red object under green like look like? Color blindness- lose r or g cones, lose b cones – very rare, lose two cones (rare), lose all cones only rods – albinism Brain injury, cortical color blindness, very rare—much more serious Dots in different colors so eye will not be able to tell by the brightness of the number Stare at red color, red cones get tired then look at white background, cones get fatigued so see bluish yellow or something...
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