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The awareness that we are focusing on a particular stimulus along with other people leads our brains to endow that stimulus with special significance, tagging it as especially important. We then allocate more mental bandwidth to that material, processing it more deeply; in scientists’ terms, we award it “cognitive prioritization.” In a world of too much information, we use shared attention to help us figure out what to focus on, then direct our mental resources toward the object that the spotlight of shared attention has illuminated. As a result of these (mostly automatic) processes, we learn things better when we attend to them with other people. We remember things better when we attend to them with other people. And we’re more likely to act upon information that has been attended to along with other people.
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