. But the vast majority of people don’t really multitask,
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, he says — they toggle back and forth between tasks. In so doing, something has to give. When a conversation becomes more dense and complicated,
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, cognitive demand devoted to it increases and that means less brainpower is available for driving.
These decrements change how people drive, and it doesn’t matter where their hands are. A team from Canada found in 2007 that drivers asked to do math problems via cell phone with both hands on the wheel spent more time looking straight ahead and less time scanning the periphery of their vision field — even while cruising through intersections — than people not talking on a phone did. The drivers also slammed on the brakes harder when traffic got sticky,
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, the researchers reported in Accident Analysis &amp,
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; Prevention,
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.
Because driving is often boring and uneventful,
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, drivers get away with these lapses most of the time. That makes the concept of cognitive burden difficult to convey, Atchley says. “It’s hard to explain why talking is dangerous.”
Strayer says people should know better. They experience blank spots in their driving all the time,
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, sometimes at 60 miles per hour. But they fail to perceive the risk of these episodes because these are the very moments when people lack “metacognitive awareness.” That is,
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, they temporarily lose the ability to step outside themselves and monitor how they are doing. They can’t take stock of their own behavior. Metacognitive awareness is important to safe driving because it provides the ability to snap to attention,

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