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Adding on to what /u/cdskip said, when we talk about the extent to which a particular visual scene is based on the brain “filling in the gaps” that are present in the visual data it receives from the eye, a defining ingredient in this recipe is the frequency with which new sets of data are received.
One still picture sourced from x% detected external light and y% “homemade” bits may very in the fidelity with which it represents the world in front of us, especially a world in motion. But 60 such pictures, each slightly different but stacked into a thick layer of visual data, shrinks these gaps and increases the overall fidelity considerably.
For a one-second gaze out the window, a single visual point frozen at a single moment in time may be “fake” data but accompanied by 59 other sets of data that include that same visual point derived from actual external information.
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