Session 22 - Life Sci 2C03 L22 Session 22 Vision 2 Lateral...

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Life Sci 2C03 – L22 Session 22 – Vision 2 Lateral Inhibition, Edge Detection and Contrasts 1. Most of our vision is based on detecting edges Colour Processing 1. Photoreceptors: Trichromatic Coding 1. Peak photoreceptor sensitivities 1. 419 nm = Blue Cone Short) 2. 496 nm = Rod 3. 531 nm = Green Cone (Medium) 4. 558 nm = Red Cone (Long) (only cones responsible for colour perception) 1. Colour Blindness 1. Protanopia 1. An inherited form of defective colour vision in which red and green hues are confused; “red” cones are filled with “green” cone opsin ( missing red cones) 1. Deuteranopia 1. An inherited form of defective color vision in which red and green hues are confused; “green” cones are filled with ”red” opsin ( missing green cones) 1. Tritanopia 1. An inherited form of defective color vision in which hues with short wavelengths (blue) are confused In all cases, Opsin is affected 1. Complementary Colours and Negative After Images 1. Adaptation: Negative Afterimages 1. The image seen after a portion of the retina is exposed to an intense visual stimulus; consists of colors complementary to those of the physical stimulus 1. Retinal Ganglion Cells: Opponent-Process Coding 1. Color sensitive ganglion cells 1. Red-Green 2. Blue-Yellow
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Life Sci 2C03 – L22 Organization of Visual Cortex 1. >25% of Visual Cortex is allotted to fovea
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Session 22 - Life Sci 2C03 L22 Session 22 Vision 2 Lateral...

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