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Optical illusions

Optical illusions






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    Optical illusions Optical illusions Presentation Transcript

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