| Optical Illusions_jpg.jpg) An optical illusion is always characterized by visually perceived images that, at least in common sense terms, are deceptive or misleading.
Therefore, the information gathered by the eye is processed by the brain to give, on the face of it, a percept that does not tally with a physical measurement of the stimulus source. A conventional assumption is that there are physiological illusions that occur naturally and cognitive illusions that can be demonstrated by specific visual tricks that say something more basic about how human perceptual systems work. | Physiological illusions
Cognitive illusions
Optical illusions
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