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Ibn Sahl 984 Laws of refraction

Ibn Sahl 984 Laws of refraction. Ibn al-Haytham (Alhazen) Book of optics 1011-21. Ray theories of light Human Visual System. Visual Attention & Visual Perception. Sight and Seeing Cognition and Eye Movement (saccade) Top-down cognition Memory Priming Knowledge Bottom-up Stimulus

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Ibn Sahl 984 Laws of refraction

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  1. Ibn Sahl 984 • Laws of refraction

  2. Ibn al-Haytham (Alhazen) • Book of optics 1011-21. • Ray theories of light • Human Visual System

  3. Visual Attention & Visual Perception • Sight and Seeing • Cognition and Eye Movement (saccade) • Top-down • cognition • Memory • Priming • Knowledge • Bottom-up • Stimulus • feature processing • pattern recognition

  4. Bracketed Perception vs. Normal Perception • A bounded visual space, oval, approximately 180° laterally, 150° vertically • Clarity of focus at only one point with a gradient of increasing vagueness toward the margin • Parallel lines appear to converge • If the head is moved, the shapes of objects appear to be deformed • The visual space appears to lack depth • A world of patterns and sensation, of surfaces, edges and gradients  Unbounded visual space • Clarity of focus throughout • Parallel lines extend without converging • If the head is moved, shapes remain constant • Visual space is never wholly depthless • A world of familiar objects and meaning

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