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Visual Illusions

Visual Illusions. Visual Illusions. Definition Illusions occur when what we see does not correspond to what is physically present in the world. Brightness After Effect. Please Stare for a while. Colour After Effect. +. Please Stare for a while. Negative Colour After Images. +.

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Visual Illusions

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  1. Visual Illusions

  2. Visual Illusions Definition Illusions occur when what we see does not correspond to what is physically present in the world

  3. Brightness After Effect Please Stare for a while

  4. Colour After Effect + Please Stare for a while

  5. Negative Colour After Images +

  6. Motion Contrast

  7. The Zöllner Illusion (Orientation Contrast)

  8. The Zöllner Illusion (Orientation Contrast)

  9. Size-Distance Relationship Object size is inferred from perceived distance and retinal image size If 2 objects have the same retinal image size (i.e., are the same real size), the object appearing further away is seen as larger

  10. Size-Distance Relationship

  11. The Ponzo Illusion Gregory’s theory The visual system makes hypotheses about distance to objects based on evidence in the image. Interpretation of size follows.

  12. Müller-Lyer Illusion

  13. Müller-Lyer Illusion 0 0 5 5 10 10 Objectively equal in separation, perceptually different

  14. Müller-Lyer Illusion 0 5 10 15 Perceptually equal in separation, objectively 30% different

  15. Müller-Lyer Illusion Perspective cues set up false interpretations of distance

  16. Ames Room

  17. Ames room Ames room sets up false distance cues Objects that are different distances appear the same distance

  18. Reversible Figure and Ground

  19. Necker cube Look at the red dot… It can be either on a near corner or a far corner

  20. Ambiguous figures Old woman looking down/young woman looking away

  21. Ambiguous figures

  22. Ambiguous figures Rabbit

  23. Ambiguous figures Duck

  24. How many dolphins?

  25. Penrose Triangle

  26. Escher’s prints The brain cannot compute 3-D structure from all parts at once, each part looks plausible in isolation

  27. Escher’s prints

  28. The Thatcher Illusion

  29. This is the same stimuli but 1 looks more strange than other

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