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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