OPTICAL ILLUSION: Why does this happen?

You stare at this dot for 30 secs and the shading starts to disappear...





http://www.crazyillusions.com/content/il...
OPTICAL ILLUSION: Why does this happen?
Hey the shading went after 10 seconds when i did it lol...


thats a weird one
OPTICAL ILLUSION: Why does this happen?
its all to do with the way that the brain processes detail





you have high definition areas and low definition areas of the brain that pick up the siganls from the optic nerve





when you view the world the eyes only see one bit in detail at any one time and this bit is surprislingly small so when you stare at the dot the brain focuses more on the high definition than the lower so as its fainter and in lower definition it fades away move your eyes and the eyes are scanning the whole image not just in one area so the whole image is displayed





hope this explains it for you :D
Reply:you eye amplifies the dark spot causing the lighter area to cleach out.
Reply:Yeah..the image of the dot is on your fovea on ur retina..the contrast for the shading is poor to start with..guess it just gets averaged out. Try these!


Look in a mirror at your eyes..now without blinking, shift ur eyes left/right..u don't actually see your eyeballs 'tracking'..only their final position. The brain 'switches off' the input from the optic nerve during the motion of the eyeballs to avoid image-processing confusion.


...or stare at a mirror for a minute or so without blinking..if u can..eventually u will 'see' your nose and mouth 'disappear' to be replaced by flesh coloured 'background' texture..similar to your own 'illusion'. There's more to vision than meets the eye!
Reply:Basically because your brain does not believe what you eyes are seeing. and show something else in you head that you brain can except,

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