Optical Illusions.

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Presentation transcript:

Optical Illusions

An optical illusion (also called a visual illusion) is characterized by visually perceived images that differ from objective reality. The information gathered by the eye is processed in the brain to give a percept that does not tally with a physical measurement of the stimulus source. There are three main types: literal optical illusions that create images that are different from the objects that make them, physiological ones that are the effects on the eyes and brain of excessive stimulation of a specific type (brightness, tilt, color, movement), and cognitive illusions where the eye and brain make unconscious inferences.

literal Something is created that is different from the images drawn

physiological The eyes and brain react to different shades of light and color

cognitive You make the brain and eye focus on one aspect of the illusion

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What color is the moving dot?

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How many triangles do you see?

How many faces do you see?

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Do you see the bull?

Do you see the skier?

Do you see the ice cream cone?