Jayson James M. Mayor

1. WHY DOES OUR MIND
SEE ILLUSIONS?
JAYSON JAMES M. MAYOR
BBTE IT 3-4D
POLYTECHNIC UNIVERSITY OF
THE PHILIPPINES

2. OBJECTIVES
At the end of this presentation, you will be able
to:
1. Understand how illusion happen.
2. Appreciate the importance of optical illusion.

3. INTRODUCTION
• An illusion is a distortion of the senses,
revealing how the brain normally organizes
and interprets sensory stimulation.

4. IMPORTANCE
• One simple way of proving the
importance of two eyes in creating the
3D sensation is to close one eye and to
try to slowly approach your two index
fingers trying to touch them. Your
fingers will probably be slightly
misaligned because the brain isn't
entirely successful in figuring out the
position of your hands (and fingers) in
the 3D space. Thus, the differences
between the two retinal images are
indeed useful.

5. • The Human brain put images together
because it has learned to expect things;
sometimes the data might get a little
confused.

6. • We may see an illusion because we know
what we are expected to see, even though
part of a picture or design may not be
completely there. The basis of this is in how
we perceive things.

7. Example
• One example of optical illusion is the television.
The television just shows us a continuous flow
of still pictures, one right after the other. Your
eyes, along with your brain, fill in all of the
empty spots.
• Our brain has learned to expect movement. As a
result, our brain can fill in all of the missing
pieces and the pictures on the television appear
to be moving, even though they really aren’t!

8. • A computer monitor is also one big optical illusion.
Sometime, when you have a chance, look at a
computer screen very closely for a minute or two.
You will notice that your computer screen is made
up of tiny red, green, and blue dots.
• The illusion here is that you see more than just red,
green, and blue dots; you see thousands of different
colors. Our brains put the red, green, and blue dots
together to make the colors!
Example

9. DID YOU KNOW
• Some studies have shown that we're doing
it much more often than we think. But in
such cases it seems much more difficult to
identify the underlining assumptions. Why
do we create these illusions? While
perceptual illusions (illusions regarding
objects) happen as side effects of our
otherwise very clever brain, psychologists
usually argue that the illusions regarding
other people serve certain purposes (such as
protecting our self-image)

18. If you take a look at the following picture , let me tell you
... it is not animated. Your eyes are making it move. To
test this, stare at one spot for a couple seconds and
everything will stop moving. Or look at the black center of
each circle and it will stop moving. But move your eyes to
the next black center and the previous will move after you
take your eyes away from it.... Weird

19. Are the purple lines straight or bent?

20. Which circle in the middle is bigger?

21. Do you see gray areas in between
the squares?
Now where did they come from?

23. Do you see an old man's face or two lovers kissing?

24. Do you see a musician or a girl's face?

28. Do you see the face? Or an Eskimo?

32. I HOPE YOU ENJOYED
OUR GAME.

33. IF YOU WANT MORE ANOTHER OPTICAL
ILLUSIONS DON’T BOTHER TO ASK ME ON
MY E-MAIL
jaysonjamesmayor@yahoo.com
jaysonjamesmayor@gmail.com