Optical illusions
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Optical illusions use visual deception to trick the eyes or brain. There are three main types: cognitive/perceptual illusions which distort size, shape or position; literal illusions which differ from the objects that create them; and physiological illusions which overstimulate the eyes or brain. Studies show females are slightly better than males at seeing some optical illusions, but age does not affect perception. Examples include impossible objects, distorted sizes, and hidden images. While most optical illusions are harmless, prolonged viewing could cause eye strain or headaches in some cases.
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Optical illusions
- 2. What is an optical illusion ? Types of optical illusions Does gender and age affect how or if we see optical illusions? Some optical illusion Can optical illusions be harmful to health?
- 3. Definition Optical Illusions are images that are concealed by other images or made to let people see something that isn't there or is not completely how they will see it.
- 4. Types Cognitive or perceptual illusions : are illusions that distort the real size, shape or position due to the surrounding elements Literal optical illusions : are images that differ from the objects that create them. Artists may use objects such as fruit or foliage to create a portraiture or scenery Physiological illusions : are the effects on the eyes or brain of excessive stimulation of a specific type - brightness, tilt, color, movement, etc.
- 5. Does gender and age affect how or if we see optical illusions? According to The UCLA Undergraduate Science Journal the results of a recent survey showed that females tend to be more able to see color, motion, and appearance optical illusions than males. There was little to no difference in older to younger participants, suggesting the psychological effect on optical illusions may be different depending on gender, but age does not make a difference. There are no physical differences in female and male eyes, but behavior, attention span and focus could be major affects on the optical illusions.
- 11. An elderly couple, or songs to a guitar accompaniment?
- 12. Is this cat going up, or down the staircase?
- 13. Is this window on the right or left of this building?
- 14. We see three normal women !
- 19. How many colors do you see?
- 20. Ames Room
- 21. Can you believe that this is a picture and not an animation?
- 23. What do you see on the left? What do you see on the right?
- 24. Can optical illusions be harmful Most optical illusions are not harmful. They are proven to not harm your vision. However, if you stare at one for too long, it may cause eye strain, sore/tired/itchy eyes, dry or watery eyes, headaches, blurred or double vision, sore neck/back, shoulder pain, light sensitivity, or difficulty focusing. Some optical illusions can be dangerous. They may cause dizziness, headaches, vomiting, and epileptic symptoms. After looking at an optical illusion, never close your eyes, or it will make the symptoms worse.
Editor's Notes
- The eyes and brain work together to play tricks or to confuse people by seeing the pictures in the form of color, size, number of images, background, and object placement. Scientists don't like calling them "optical illusions" because the true definition of an optical illusion is when an illusion happens because of some parts of the eye. For example, floaters. Floaters are small specks, spots or shadowy shapes that seem to float in your vision. They are caused by tiny flaws in the fluid that fills the eye. They are real. True optical illusions are rare, so scientists prefer to call them visual illusions
- This triangle illusion is named after the Italian psychologist Gaetano Kanizsa. To prove that people experience reality not as it really is but as it is seen through special filters called mental models, he drew a series of geometrical figures giving an impression that there is a bright white triangle in the center. However, this triangle doesn’t really exist at all.
- This optical illusion of relative size perception is named after German psychologist Hermann Ebbinghaus. This illusion consists in misperceiving the size of circles. In this version, as shown in the picture, two circles of identical size are placed close to each other. One is surrounded by large circles while the other is surrounded by small ones. The central circle on the right then appears bigger than the left central circle.
- This so called false optical illusion is created by overlapping segments that appear to form a spiral; however, the arcs are really a series of ordinary circles.
- This impossible cube was invented by Charles Cochran in 1966. The illusion of depth in this picture occurs because of incorrect connections between the cube’s corners. Do not even attempt to unravel the secret of this unrealistic figure.
- We rarely encounter upside-down faces, so, when we do, it’s very difficult to spot any distortion.
- Focus your eyes on a black dot in the center, then, move your head slightly forward and backward. If you look at the picture again, you will see the outer circles rotating in the opposite directions.
- Focus your eyes on a black dot in the center, then, move your head slightly forward and backward. If you look at the picture again, you will see the outer circles rotating in the opposite directions.
- Stare at the black lightbulb for at least 30 seconds. Then immediately stare at a white area on the screen or at a sheet of paper. You should see a glowing light bulb!
- There are only 3 colors: White, green, and pink. There seem to be two different shades of pink, but there is only one pink.
- Upon entering this room, people of average height seem to become either dwarves or giants. It was devised by ophthalmologist Adelbert Ames, Jr. in 1934.
- To check, just focus on one leaf for 5 seconds