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What causes this to happen?

http://ebaumsworld.com/2006/08/dotillusi...

That's an image where you stare at a dot and all the color around the dot eventually fades...what's going on in your eyes or brain or whatever that causes that? It's so neat!

3 months ago
Here's another really neat one with the same concept

http://ebaumsworld.com/2006/08/trippyred...

You focus on the dot so that your brain filters out the faint color information in the periphery. You're only taking in what really stands out. It happens in your eyes, but it's caused by your brain.