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I Got the Data (on cell phone dangers)

In this Moment of Science, we discuss more evidence on the dangers of talking on cell phones--hands-free or not--while driving.

A study done by a psychologist and an engineer at the University of Rhode Island had volunteers wear eye-tracking devices while they drove. The researchers found that a driver's eyes move around a lot--we scan the road, check our speedometers, and stay alert for surprises. When talking on a cell phone at the same time, though, eye motions fell to almost zero--the subjects simply stared at the bumper ahead of them.

The issue seems to be not talking on the phone per se but concentrating on a second task, such as making a decision with the person on the other end of the line. When we do that, we take our mental energy away from driving. And that's dangerous!

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