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Optical illusions


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Optical illusions

  1. 1. Optical illusions<br />David Macías Arias<br />C.I. El Altillo School<br />
  2. 2. Outline of project<br /><ul><li>What are optical illusions?
  3. 3. Types of illusions
  4. 4. Physiological illusions
  5. 5. Cognitive illusions
  6. 6. Artists
  7. 7. Examples
  8. 8. Questionnaire</li></li></ul><li>What are optical illusions?<br /><ul><li> Any illusion of sense of view, which brings us to perceive the reality erroneously.
  9. 9. Information collected by the eye is processed in the brain to give a perception that is not consistent with the picture.</li></li></ul><li>Types of illusions<br /><ul><li> Literal illusions: create images which are different to objects.
  10. 10. Physiological illusions: effects on the eyes and the brain of excessive stimulation (brightness, inclination, colour).
  11. 11. Cognitive illusions: eye and the brain make interferences in an unconscious way. </li></ul> <br />
  12. 12. Physiological illusions<br /><ul><li> Alterations in perception caused by structural or functional own perception system peculiarities.
  13. 13. The films, as the majority of illusions, are based on this kind of illusion. </li></li></ul><li>Physiological illusions (cont.)<br /><ul><li> The Hermann Grid illusion and the Mach bands are two well-known physiological illusions, explained from Biology.</li></ul>Notice the dark band that appears immediately to the right and the light band that appears immediately to the left of the middle strip.<br />Dark blobs appear at the intersections.<br />
  14. 14. Cognitive illusions<br /><ul><li> Divided in ambiguous illusions, distorted illusions, paradox illusions and illusions of fiction. </li></li></ul><li>Cognitive illusions (cont.)<br /><ul><li> Ambiguous illusions: pictures or objects that cause alternative interpretations.
  15. 15. This is a well-known example. </li></li></ul><li>Cognitive illusions (cont.)<br /><ul><li> Distorted illusions: distortions in the size, duration or curvature.
  16. 16. A notable example is the famous illusion of Müller-Lyer. </li></li></ul><li>Cognitiveillusions (cont.)<br /><ul><li>Paradoxillusions: objectsthat are paradoxicalorimpossible.
  17. 17. ThePenrosetriangleisonetypicalexample. Theelefantillusionisalsoknown</li></li></ul><li>Cognitive illusions (cont.)<br /><ul><li> Illusions of fiction: objects that are not really there.
  18. 18. Also are known as hallucinations.</li></li></ul><li>Artists<br /><ul><li> M. C. Escher, Bridget Riley, Salvador Dalí, Charles Allan Gilbert…
  19. 19. Also some contemporary artists: István Orosz, Rob Gonsalves and Akiyoshi Kitaoka. </li></ul> <br />
  20. 20. Artists (cont.)<br /><ul><li> Salvador Dalí creates the paranoiac-critical method.
  21. 21. The ability to perceive links between objects that are rational or apparently not connected. </li></li></ul><li>This picture is named: Los cisnes que reflejan elefantes.<br />
  22. 22. Artists (cont.)<br /><ul><li> Akiyoshi Kitaoka is a Professor of Psychology at the University of Kyoto, Japan.
  23. 23. His work are based on images that appear to be moving. </li></li></ul><li>This picture has been named: Rollers.<br />
  24. 24. Examples<br />
  25. 25. Examples (cont.)<br />
  26. 26. Examples (cont.)<br />
  27. 27. Examples (cont.)<br />
  28. 28. Questionnaire<br />1. Which are the three main kinds of optical illusions?<br />a) Literal, cognitive and physiological illusions.<br />b) Visual, communicative and phyilosofic illusions.<br />2. Thehallucinations are inside of the illusions:<br />a) Cognitive.<br />b) Physiological.<br />