Imagine that driving across town, you've fallen into a reverie, meditating on lost loves or calculating your next tax payments. You're so distracted that you rear-end the car in front of you at 10 miles an hour. You probably think: Damn. My fault. My mind just wasn't there.
By contrast, imagine that you drive across town in a state of mild exhilaration, multitasking on your way to a sales meeting. You're drinking coffee and talking to your boss on a cellphone, practicing your pitch. You cause an identical accident. You've heard all the warnings about cellphones and driving--but on a gut level, this wreck might bewilder you in a way that the first scenario didn't. Wasn't I operating at peak alertness just then? Your brain had been aroused to perform several tasks, and you had an illusory sense that you must be performing them well.
That illusion of competence is one of the things that worry scholars who study attention, cognition, and the classroom. Students' minds have been wandering since the dawn of education. But until recently--so the worry goes--students at least knew when they had checked out. A student today who moves his attention rapid-fire from text-messaging to the lecture to Facebook to note-taking and back again may walk away from the class feeling buzzed and alert, with a sense that he has absorbed much more of the lesson than he actually has.
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