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Lec 5.docx

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Matthias Niemeier

Lec 5 Short answer : the greebles experiment. Had lil figures and they were trained to recognize them. Found that those who were trained to recognize greebles a specific brain area lite up and there was increase activity in the fusiform face area. The fusiform face area is not really a face area, but a place that whatever you expertise on that’s what your gonna recognize. For sure in the right hemi, its for visual expertise of objects not just faces How many colors can you see? We can see 3 colors, based on our 3 cones. But we can see many color combos -univarian color: cant see colors Basic principles of color -we have single light source-the sun and its white light -Colors are physical response from waves, its caused by reflection -at night we only use our rods, respond to same wavelengths and you only see things in 1 dimension in blck and white -rods are sensitive to green light tho? -green filter: if we just had a green filter you would see nose and stars have same luminense -cant distinguish between colors with just a green filter, -some combo of wavelengths and intensity can elicit same response in 1 type of cones, it’s the same everywhere in the retina-problem of univariance, 1 type of photoreceptor can not make color discrimination -shine diff colors of light onto cones all diff lights have same energy that results in bell shape type cone -cones are most sensitive to green light even though it has same energy as others, the response is less -blue light same intensity 450nm would create same time of response on that wavelength -single cone cant tell us color alone -certain things we cant see because of metameres, we see things as mixed and cant see diff Trichomacy -all rods have sensitivity to same light, but they are more sensitive to green light --cant discriminate colors of light -newton: when you shine white light to a prism light is broken up into a rainbow, spectral components of what they perceive as white light -color must be a product of sensation -young-hemholtz theory: trichomatic staes, color vision is based on 3 photorecpetors -whe n you have a light source that shines light of 1 wavelength you can synthesize that -there are 3 mechanism that give rise to color vision -blue n orange light have diff set of responses in the 3 cones Reflected light from real world objects -power great
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