If only we had a system that let us take in what we do need to see— —and of course, we do: that system is attention. Having a way to tune out unnecessary information, to sort through the bombardment of visual and auditory noise, solves these problems. Objects in the world may seem benign, impotently hoping that your glance will light on them, but they are competing with each other for your regard. Attention is an intentional, unapologetic discriminator. It asks what is relevant right now, and gears us up to notice only that. Why bother sorting out all the elements of a visual scene? Evolution
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Hmph, this claims attention is something completely rational for survival.
