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Two Views of Perception: Bottom-up processing: -Low-level -Feature driven Top-down processing

Two Views of Perception: Bottom-up processing: -Low-level -Feature driven Top-down processing - Knowledge driven -Unconscious inference (Helmholtz). What do you see in this picture?. Vertical Line Stimulating Receptive Field of Single Cell. Stimulation of a Single Cell by Downward Motion.

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Two Views of Perception: Bottom-up processing: -Low-level -Feature driven Top-down processing

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  1. Two Views of Perception: • Bottom-up processing: -Low-level -Feature driven • Top-down processing • -Knowledge driven • -Unconscious inference (Helmholtz)

  2. What do you see in this picture?

  3. Vertical Line Stimulating Receptive Field of Single Cell

  4. Stimulation of a Single Cell by Downward Motion

  5. BRIGHTNESS CONTRAST

  6. Stimulus Luminance Profile

  7. Mach Bands - Edge Enhancement Illusion

  8. How the Eye Accentuates Edges

  9. Mach Bands

  10. Recording From a Single Cell of the Visual Cortex

  11. Frequency of Firing of Single Receptor in Response to Stimuli of Different Amplitude

  12. Inhibitory Effects of Stimulating Adjacent Receptor

  13. Simple Cell in Visual Cortex

  14. Complex Cell of Visual Cortex

  15. On-Off and Center Cells (Retina)

  16. How the Visual System Responds to Edges

  17. Lateral Inhibition

  18. Excitatory & Inhibitory Cells

  19. Which column is largest?

  20. Which Line is Longer?

  21. Which lines are parallel?

  22. Are lines a and b parallel?

  23. Which Line is Longer?

  24. Which central dot is larger?

  25. Necker Cube

  26. What is This a Picture of?

  27. Excitatory & Inhibitory Cells

  28. Bottom-up Perception

  29. Which woman is taller?

  30. Binocular Cues for Depth • Convergence • Binocular disparity

  31. Monocular Cues for Depth • Interposition • Linear perspective • Height in vertical plane • Texture • Shadow • Relative motion

  32. Visual Angle

  33. Interposition. Which is closer? A or B? A B

  34. Which column is largest?

  35. Linear Perspective

  36. Which red line is bigger?

  37. Which red line is bigger? Which red line is bigger?

  38. Linear Perspective

  39. Height in Visual Field

  40. Texture gradients

  41. Texture Gradient

  42. Which woman is taller?

  43. “AMES”Room

  44. Direction of Shadow

  45. Haze

  46. Haze

  47. Shading

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