Quote:
Originally Posted by NullNix
Some of the work the visual cortex does involves making really quite radical adjustments to perceived colour and contrast levels: these adjustments are optimized for making sense of objects in the real world, not for observing the levels of colour and intensity across a piece of paper or e-ink screen or for observing what is "really there". For instance, one adjustment made very early in the visual cortex is to use both sharp and gradual colour and intensity changes in an apparently continuous object as a clue to the 3D shape of an object with constant colour that is partially in shadow
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An excellent illustration of the amount of adjustment the brain makes is the well-known checkerboard illusion:
The squares marked A & B are actually the same shade of grey.
/JB