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Critical Thinking: Science and Pseudoscience

Critical Thinking: Science and Pseudoscience. David E. Thomas PSY 131 July 27 th , 2015 Week 8, Lecture 28 Optical Illusions dthomas@passcal.nmt.edu. Agenda. Optical Illusions How do they Work?. Which is Longer? And, Why?. Perspective and Size. Perspective and Size. Perspective.

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Critical Thinking: Science and Pseudoscience

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  1. Critical Thinking: Science and Pseudoscience David E. Thomas PSY 131 July 27th, 2015 Week 8, Lecture 28 Optical Illusions dthomas@passcal.nmt.edu

  2. Agenda • Optical Illusions • How do they Work?

  3. Which is Longer? And, Why?

  4. Perspective and Size

  5. Perspective and Size

  6. Perspective Shephard's illusion

  7. Escher-Style Illusions: 3D Ambiguity, Necker Cubes

  8. 3D Ambiguity

  9. 3D Ambiguity

  10. 3D Ambiguity How can you remove one of the glasses from the tray?

  11. 3D Ambiguity

  12. 3D Ambiguity

  13. 3D Ambiguity

  14. Shadows and Brightness Top Gray = Bottom White

  15. Shadows and Brightness

  16. Shadows and Brightness

  17. Shadows and Brightness Different people see this differently!

  18. Color Exhaustion

  19. Color Exhaustion

  20. Color Exhaustion – John Sadowski

  21. Paired Color Cells - Explanation Some ganglions (nerve cells) process red and green colors (opposites), but only one a a time. Others process blue and yellow colors (again, opposites), and again, one at a time. When you stared at the false-color image, the cells seeing orange (sky) got tired, likewise for the cells seeing blue (castle), causing a bright blue sky and tawny castle.

  22. Color Exhaustion

  23. Perception of Embedded Colors Green on left, Blue on Right?

  24. Perception of Embedded Colors

  25. Perception of Embedded Colors

  26. Perception of Embedded Colors The orange stripes go through the "green" spiral but not the "blue" one?

  27. Perception of Embedded Colors Violet on left, Pink on Right?

  28. Hodgepodge Optical Illusions

  29. Visual Continuity

  30. Seeing things that Do Not Exist Lateral Inhibition – Response of some cells reduced when neighbors are also firing...

  31. More Lateral Inhibition

  32. More Lateral Inhibition

  33. Presentation by Implication

  34. How many Circles?

  35. This is not an Animated GIF!

  36. This is not an Animated GIF!

  37. Coarse versus Fine Detail

  38. Perception of Motion

  39. Change Blindness With Interruptions

  40. Change Blindness Without Interruptions

  41. Distance-Dependent Illusion

  42. Motion Clockwise, or Counterclockwise?

  43. Motion and Continuity

  44. This IS an Animated GIF!

  45. This IS an Animated GIF!

  46. Motion Exhaustion... http://www.youtube.com/watch?v=Xg_y7X5y2BI

  47. Peripheral Motion Illusion... http://www.newscientist.com/movie/best-new-visual-illusions-curveball

  48. Peripheral Vision and Time

  49. Peripheral Vision and Time Blank: http://www.passcal.nmt.edu/~dthomas/classes/final-blank.gif Both: http://www.passcal.nmt.edu/~dthomas/classes/mega-movie.gif Illusion: http://www.passcal.nmt.edu/~dthomas/classes/final-lightcyan.gif Not so much: http://www.passcal.nmt.edu/~dthomas/classes/final-cyan-red.gif

  50. Student Soapbox

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