Optical Illusions
An optical illusion is a visually perceived image that is decepting or misleading to the human eye.
Physiological Illusions |
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Physiological illusions are the effects on the eyes or brain of continued stimulation such as brightess, tilt, color or movement.
- After-image Look at this woman for about one minute then look at the empty box on the right.
- Blind spot Cover your left eye & look at the left cross. Move towards the screen, the dot diasppears & visa versa.
- Hermann's Illusion There appears to be small black dots fleeting the screen.
- Grey blocks Same colour illusion.
- A & B are the same Another colour illusion.
- Make 'a' bigger Stare at the cross in diagram B for 30 seconds.
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Cognitive Illusions
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Cognitive illusions interact with different levels of perceptual processing, our innate assumptions are misdirected.
Cognitive Illusions can be divided into three categories:
- Ambiguous illusions - pictures or objects that present the viewer with a mental choice of two interpretations.
- Distorting illusions - characterized by distortions of size, length, colour or curvature.
- Paradox illusions, or fictional illusions - generated by objects that are paradoxical or impossible in "real life" or 3-D, but look convincing & perplexing in 2-D drawings.
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Two word illusions |
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