BMB_2_8_11 - Chapter 4 Vision Trichromatic Coding...

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Chapter 4
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Vision
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Trichromatic Coding
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Trichromatic Coding Protanopia: Confuse red & green. See world in shades of yellow & blue. Red & green look yellow. Visual acuity is normal so no shortage of cones. Suggests red cones are filled with green opsin. Deuteranopia: Confuse red & green. Have normal visual acuity. Green cones filled with red opsin. Tritanopia: Do not perceive short wavelengths of light. Thus, see world in greens & reds. Blue sky looks green. Yellow looks pink. Retina lacks blue cones, but does not affect visual acuity because there aren’t a lot of blue cones in the healthy retina either.
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Opponent-Process Coding Opponent process theory of color vision: white versus black red versus green yellow versus blue
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Opponent-Process Coding Excite Inhibit No Change Excite
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Cells in the Visual Cortex: Simple Cells: respond in center-on/center-off manner similar to retinal Complex Cells:
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BMB_2_8_11 - Chapter 4 Vision Trichromatic Coding...

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