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The human ear has a set range of frequencies it can tune to, and the human eye only sees in the visible light spectrum, and you can't see very well in the dark. You can only hear and see so far away, and like you said, the brain can focus on the most important stuff.
Some people can't "cross-talk," where you have two conversations among four people where one of the paired communications is crossing your line of attention, so filtering differs from person to person.
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