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What is the brain up to?
Consider, for a few moments, all of the internal processing that the brain needed to do to produce the 3D world. The brain possesses the astonishing ability to see a few simple lines as a world. What do you see when the objects stop moving? Do you see a square and a triangle in the foreground, blocking out portions of (i.e., occluding) the objects behind? But isn't that a bit odd? There is no triangle. There are are only a few chunks cut out of the rectangles. But the visual system "sees" a triangle in those missing chunks because that is the interpretation of the scene that it selects as the proper one. The brain is doing a good deal of "processing" as it constructs three-dimensional experiences of the world. How are we going to figure out WHAT exactly it is doing and HOW it is doing it? ONE WAY -- Experiments on HUMAN SUBJECTS,
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