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Optical Illusions

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Understanding what we see mostly happens in the brain, ... The process of seeing begins with the presence of light, an image being formed on the retina, ... – PowerPoint PPT presentation

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Title: Optical Illusions


1
Optical Illusions
2
Do we know what the world looks like?The eye is
made up of some of the most amazing tissue in the
body. The lens, for example, is perfectly clear,
perfectly curved and is capable of focusing on an
incredible amount of data. But vision has only
partly to do with the retina, lens, and cornea.
Understanding what we see mostly happens in the
brain, which is why a person with perfect vision
is still susceptible to optical illusions. Do we
know what the world looks like? We know
approximately what it looks like, which is enough
to get by, but our perception of the world is not
without a certain amount of 'misreading.' Our
visual nervous system approximates color, shape,
and dimension.
3
A Person With Perfect Vision is Still Susceptible
to Optical Illusions! The process of seeing
begins with the presence of light, an image being
formed on the retina, and an impulse transmitted
to the brain, but there are many other factors
that play a part in how we perceive visually. Our
perceptions are influenced by our past
experiences, imagination, and associations.
4
You probably read the word ME in brown,
but....... when you look through MEyou will see
YOU!
5
The "illusion" is that this is just a picture of
coffee beans but it is not. Can you find a man's
face among the beans? Some say that if you find
the man in 3 seconds or less, the right half of
your brain may be more well developed than most.
PS This is not a trick. A man's face is really
hidden among the beans.
6
The following pictures are NOT animated.
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10
Can you count the black dots?
ContrastThis grid, known as Hermann's Grid, is
an example of how contrast affects color
perception. The area at the corners of the black
boxes appear gray. This happens because of
something called lateral inhibition. In the
retina when some light-receiving cells are
activated others around them shut down.
11
How many legs does this elephant have?
12
Man playing a horn?Or woman's face?
13
A skull? Or a woman looking into a vanity
mirror?
14
One face? Or two profiles facing each other?
15
Do you see one man in this picture...or several
people?If you look very carefully, you'll find 9
different faces in the picture the 9th belongs
to a dog.
16
Which of the figures in the picture do you think
would measure the tallest with a ruler?
17
What do see? A face, or the word liar?
18
Lift or just black splotches? Girls usually see
it better than boys.
19
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20
Is this woman old...or young?
21
How many human faces can you find in this
picture?
22
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23
Two elderly faces, or a larger scene?
24
Faces or places?
25
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26
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27
Where does the puzzle begin and end?
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