swfchan: BlindSpotTest.swf (info)

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The brain and the eyes have a special interrelationship
that goes well beyond what you may normally consider.
While most people think that what you see is simply
what your eyes "see" and send to your brain, the truth is
that much of what we see is actually information made
up by our brain -- things that our eyes never actually see!
The following tests will demonstrate just how big of a
role our brain plays in what we see (and don't worry...
nothing is going to jump out at you and scream, we
promise!)

Below, you'll see a star on the left and a large dot on the
right. Cover your left eye, and look at the star using your
right eye. With your left eye closed, slowly move closer
to your monitor. At some point, the dot on the right will
vanish (if you move even closer, the dot will re-appear).

"So what?", you say? Well, what's interesting is not so
much that the dot disappears -- but that your brain fills
in the space where the dot was (in this case, with light
gray, like the background).
If your eye didn't see the black dot, how did it see the
gray background? It didn't! Your brain made it up!

Maybe you're still not convinced... This time, we put the
dot on the left and the star (now spinning) on the right.
Cover your left eye, and look at the dot using your right
eye. When you move closer to your monitor, the star will
vanish, and your brain will "fill in" the spot with light gray.
The spinning of the star in no way "distracts" your brain,
because your eye simply never sees it.

Maybe you're thinking that the light gray background is
the key. Nope! Cover your left eye, and look at the dot
again. When the star vanishes, your brain fills in the
space with (you guessed it) blue.

Flip the red and blue, and try again... Just as expected,
the star vanishes, and your brain fills in the space with
red.

This time, we'll quickly alternate between red/blue and
blue/red. Try it again. Even with the colors rapidly
alternating, your brain correctly fills in the area which
your eye can't see.

Ok, you get the picture (no pun intended!) For our finale,
we're going to use a complex pattern instead of a solid
color. Try it again. When the star vanishes, your brain
will fill in the area that your eye can't see with the
surrounding checkerboard pattern.
We don't know about you, but we're amazed!

We hope that you've enjoyed this little mini adventure
into just one of the many amazing functions of the
human brain.
Remember... our eyes are only as good as our brain, so
keep that brain in tip-top shape, or who knows what you
might end up seeing!

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