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Optical illusions and you.

Our mind is one of the most fascinating parts of our body, but have you ever wondered what makes it tick, what confuses it, what we think and see?

meghan fillier

on 22 February 2013

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Transcript of Optical illusions and you.

Optical Illusions and you.... How Do Optical
Illusions Work? What is an optical illusion? What major components
help us to see optical illusions? Optical Illusions and You Investigating Illusions Optical illusions, known as
visual illusions involves visual deception. Due to the arrangement of images,
effect of colors, impact of light source
or other variable, a wide range of
misleading visual effects can be seen. Some examples of some
well known illusions are...... The Rotating Wheel Illusion The Figure-ground Illusion Even something basic but complex
like the Penrose Triangle. While optical illusions can be fun
and interesting, they also reveal a great
deal about the working of the brain. When Your Brain Can't
Believe Your Eyes Basically, the effects of which
we can see the optical illusions
are narrowed down into 3 major
categories, Color, brightness and
shadow. Take colour. Why do we need to see in
colour? The next two images will show you why. Here you see a black-and-white
version of a jungle scene. Try to find
the predator that's about to jump out
at you. Why is it so difficult to find?
Because you are only seeing the
surfaces according to the amount
of light they reflect. This time in colour. Now you'll
probably see the panther immediately,
but why is it so easy to see this time?
Its because the image shows the
surfaces according to the quality of
light they reflect (not just their intensity). In other words, your brain has a lot
more information to go on in making
its decisions. So colour enables us to see a greater number of similarities and differences between objects, which is necessary for survival. Below we have two physically identical
squares. Not surprisingly, they also look the same. You may wonder how the brightness
factor ties into the illusion.... Well.... what happens if I change the brightness surrounding the squares,
but not the two squares themselves? For some illusions, some people
simply are not able to see the effect. If you've ever struggled to see the hidden image in a single-image stereogram, you may have discovered that not everyone experience
illusions in the same way. What do you see in this illusion? The image and the two identical squares now look different. And yet all we've done is put them on different backgrounds. As a result, the small square on the dark background looks lighter than the one on the light background. This is called the "brightness contrast illusion", which proves that context is everything when it comes to what we see, even when seeing the simplest qualities of the world, namely lightness. The checker shadow illusion is an optical illusion published by Edward H. Adelson, Professor of Vision Science at MIT. The image depicts a checkerboard with light and dark squares. The optical illusion is that the area of the image labeled A appears to be a darker color than the area of the image labeled B. However, they are actually exactly the same color. Here is a video
demonstrating the
illusion itself. Optical illusions are one of sciences
most unusual yet fascinating studies,
the topic itself poses study to our brains and our vision all in one. The fact is, People were creating optical illusions long before we knew what made them work. Today, advances in neuroscience have pinpointed the visual processes that fool your brain into falling for many of them. To me, its one of the most interesting studies there is. Its merely asking yourself, What am i seeing?
What am i believeing? Well, what do you think? Prezi edited by: Homeroom: Submitted to: The End .... Meghan Fillier Mr. Locke
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