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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
VISUAL APARATUS
EXTERNAL / PHYSICAL
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 WORKBY EXPLOITING VISUAL CUES
SOME MONOCULAR CUES
1. Texture Gradient
2. Relative Motion Parallax
3. Linear Perspective
4. Light and Shadow
5. Relative Size
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OPTICAL ILLUSIONS WORKBY 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
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