Ibn Sahl 984

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• Ibn Sahl 984
• Laws of refraction

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

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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

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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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