OPTICAL ILLUSIONS

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OPTICAL ILLUSIONS

• BY
• KAMILLE C. HERNANDEZ

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ILLUSIONS AND PERCEPTION

• ILLUSIONS DEPEND ON PERCEPTION
• PERCEPTION HAS THREE LINKS

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THREE LINKS TO PERCEPTION
EXTERNAL / PHYSICAL
VISUAL APARATUS
INTERPRETATION OF STIMULUS
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WHAT IS AN OPTICAL ILLUSION ?

• illusions that deceive the human visual system
  into perceiving something that is not present or
  incorrectly perceiving what is present.

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TWO TYPES

• PHYSIOLOGICAL ILLUSIONS
• COGNITIVE VISUAL ILLUSIONS

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A PHYSIOLOGICAL ILLUSION

• is the what happens to the eyes as a result of
  prolonged stimulation. i.e. brightness, tilt,
  movement, color etc.
• repetitive stimulation misleads the visual
  system in the early stages of visual processing.
  

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A COGNITIVE VISUAL ILLUSION

• Exploits the predictive cues of early visual
  processing.
• Misdirects in-built assumptions or knowledge
  while processing.

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Three Types of Visual Illusions

• Ambiguous Illusions
• Distorting Illusions
• Paradox illusions/
• /Fictitious illusions.

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OPTICAL ILLUSIONS WORK BY EXPLOITING VISUAL
CUES

• SOME MONOCULAR CUES
• Texture Gradient
• Relative Motion Parallax
• Linear Perspective
• Light and Shadow
• Relative Size

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OPTICAL ILLUSIONS WORK BY EXPLOITING VISUAL
CUES

• Some Binocular Cues
• Binocular Disparity
• Convergence
• Accommodation

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SOME COOL ILLUSIONS

• MY SPEECH TIME
• SLIDE EXPLAINATIONS
• CLASS PARTICIPATION

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THE END

• REFERENCES
• INTERNET
• TEXTBOOK