The reason we have “attention” is to solve one of the brain’s big problems: There is far more information in our environment (and in our own minds!) than the brain can fully process. Without a way to filter, the relentless sensory input would leave us overloaded, incapable of functioning effectively. The attention system is like a flashlight. It allows us to select and direct our brain’s computational resources to a smaller subset of the information. We can narrow our sights onto our conversation partner and boost her voice in a crowded room while dimming down other sights and sounds.