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Optical Illusions

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Carolyn Tirella

on 3 May 2013

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Transcript of Optical Illusions

The rectangles are the same color, but because the one on the left is surrounded by white, it looks lighter than the one surrounded by black. - create images that are different than the objects that make them Literal Illusions Cognitive Illusions By: Shezreh, Carolyn, and Sarah Optical Illusions - the effects on one's eyes or brain after stimulating them for a long amount of time
(types of stimuli include brightness, tilt, color, and movement)
- types of phsiological illusions include: color and contrast illusions, after effect illusions, and aparent motion illusions Phsiological Illusions Pictures that alter one's perception and make him or her see things that aren't really there Cognitive Illusions are the most well-known illusions. They interact with different levels of perceptual processing, causing assumptions to be redirected to the brain. Cognitve illusions are divided into four groups: Ambiguous, Distorting, Paradox, and Fictions. Ambiguous Illusions Pictures of objects that elicit a perpetual switch between the alternative interpretations. Distorting Illusions Caracterized by distortions of size, length, position, or curves Paradox Illusions generated by objects that are paradoxical, or impossible Fiction Illusions perception of objects that are genuinely not there Café Wall Illusion White's Illusion
- an example of a color and contrast illusion - An illusion created by black and white rectangular tiles put together in a zigzag pattern.
- The gray lines are actually parallel even though they don't seem to be. - First noticed on the wall decoration of a café in Bristol, England. Zöllner's Illusion - Vertical lines appear to be parallel but aren't Rotating Snakes Illusion
- an example of an apparent motion illusion The snakes seem to be constantly rotating because of how we perceive all the colors. We see the colors in the direction of black -> blue/ dark gray ->
white -> green/ light gray. This sequence of colors generates the sense of motion we see when looking at the snakes. After Effect Illusions cause us to see colors, motion, or objects that are not there. Stare at the black dot for 20 seconds and then quickly look at the black square. You should see an after effect of a white circle. Focus on the plus sign in the middle of the circle until you see a yellow green dot following the purple ones. The yellow-green dot isn't there, but it is an after effect. If you look at the purple dots instead of the center, all of the dots stay purple. The window frame looks like it is swinging back and forth. It is actually not a window and is rotating in complete circles. The window frame is really a flat card with a "picture" of a window painted on each side.The card is shapedlike a trapezoid, and madeto look like a real window in 3D.Even though the window seems to pauseand swing back, it is actually swinging all the way around. There is no pause. The Penrose stairs is a two-dimensional depiction of a staircase in which the stairs make four 90-degree turns as they ascend or descend yet form a continuous loop, so that a person could climb them forever and never get any higher. This is clearly impossible in three dimensions. Video Depending on whether the visual perspective is focused on the foreground, the background, or both; one might perceive a white vase, two black faces staring at one another, or both a vase and two faces at the same time. What kinds of Optical Illusions do you see? THE END !!!!!!!!!
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