Wednesday, January 04, 2006

Visual Trickery

Or, why you shouldn't necessarily believe everything you see.

If your eyes follow the movement of the rotating pink dot, you will only see one color, pink. But if you stare at the black + in the center, the moving dot becomes green. Now, concentrate longer on the black + in the center of the picture. After a short period of time, all the pink dots will slowly fade away and you will only see a rotating green dot. Don't see it? Well, keep staring! (But be careful; if you are like me, you will start to feel nauseous after a short time).

It's amazing how our brain interprets this animation because there really is no green dot, and the pink dots don't disappear. This nicely illustrates how we don't always see what we think we see.

Click image to go to source.

Thanks for sharing the animation, Cheri.

Nominated (!!) to the Big Apple Blog Festival
Issue 19.


© 2004, 2005, 2006 by GrrlScientist

8 Peer Reviews:

Blogger Ms.PhD said...

Damn, that is scary. Mostly because I spend an awful lot of time looking at red and green dots all day. Now I'm worried some of them are not what I thought I saw-! I guess that's why we use computers to analyze our data...

9:31 PM  
Anonymous Comet said...

Wow, that's crazy-fun!!!

11:56 PM  
Anonymous Laura said...

Very interesting!

12:54 AM  
Blogger : Joseph j7uy5 said...

Great! If you haven't seen it already, you might want to go to:

1:28 AM  
Blogger cpbvk said...

Great demonstration of "simultaneous contrast." When the red dot disappears, the eye spontaneously generates its complementary (green) on the pure gray neutral background. Thanks!!

5:50 PM  
Anonymous BWJones said...

So, the test question for everybody is..... Is this a retinal illusion or a cortical one?

7:44 PM  
Anonymous Walt said...

This is and after-image illusion the green is the negative image of the pink.

I'm not an eye expert but I'll guess the after-image effect is a retinal illusion.

I originally found this here

3:24 PM  
Blogger GrrlScientist said...

MS PhD; I thought you would appreciate this when I first saw it.

Thanks everyone else for enjoying this and for posting links that provide more information about this illusion.


6:47 PM  

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