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We find that students engage in substantial multitasking behavior with their laptops and have non course-related software applications open and active about 42% of the time.

Although many students may believe they can switch back and forth between different tasks with no serious consequences to their academic performance, multitasking has been shown to dramaticaUy increase the number of memory errors and the processing time required to "learn" topics that involve a significant cognitive load

Although many students may believe they can switch back and forth between different tasks with no serious consequences to their academic performance,

In every test, students who spent less time simultaneously reading e-mail, surfing the web, talking on the phone and watching TV performed best.

college students who routinely juggle many flows of information, bouncing from e-mail to web text to video to chat to phone calls, fared significantly worse than their low-multitasking peers

Nass is skeptical. In a recent unpublished study, he and his colleagues found that chronic media multitaskers—people who spent several hours a day juggling multiple screen tasks—performed worse than otherwise similar peers on analytic questions drawn from the LSAT. He isn't sure which way the causation runs here: It might be that media multitaskers are hyperdistractible people who always would have done poorly on LSAT questions, even in the pre-Internet era. But he worries that media multitasking might actually be destroying students' capacity for reasoning.

is whether media multitasking is driven by a desire for new information or by an avoidance of existing information. Are people in these settings multitasking because the other media are alluring—that is, they're really dying to play Freecell or read Facebook or shop on eBay—or is it just an aversion to the task at hand?"

But those scholars also became intrigued by the range of individual variation they found. Some people seemed to be consistently better than others at concentrating amid distraction. At the same time, there were no superstars: Beyond a fairly low level of multitasking, everyone's performance breaks down. People can walk and chew gum at the same time, but not walk, chew gum, play Frisbee, and solve calculus problems.

The mental habit of dividing one's attention into many small slices has significant implications for the way young people learn, reason, socialize, do creative work and understand the world. Although such habits may prepare kids for today's frenzied workplace, many cognitive scientists are positively alarmed by the trend. "Kids that are instant messaging while doing homework, playing games online and watching TV, I predict, aren't going to do well in the long run," says Jordan Grafman, chief of the cognitive neuroscience section at the National Institute of Neurological Disorders and Stroke (NINDS). Decades of research (not to mention common sense) indicate that the quality of one's output and depth of thought deteriorate as one attends to ever more tasks. Some are concerned about the disappearance of mental downtime to relax and reflect. Roberts notes Stanford students "can't go the few minutes between their 10 o'clock and 11 o'clock classes without talking on their cell phones. It seems to me that there's almost a discomfort with not being stimulated--a kind of 'I can't stand the silence.'"

ALTHOUGH MANY ASPECTS OF THE networked life remain scientifically uncharted, there's substantial literature on how the brain handles multitasking. And basically, it doesn't. It may seem that a teenage girl is writing an instant message, burning a CD and telling her mother that she's doing homework--all at the same time--but what's really going on is a rapid toggling among tasks rather than simultaneous processing. "You're doing more than one thing, but you're ordering them and deciding which one to do at any one time," explains neuroscientist Grafman.

"Heavy multitaskers are lousy at multitasking... The more you do it, the worse you get," said Stanford communications professor Clifford Nass.

Compulsive media multitaskers are worse at focusing their attention, worse at organizing information, and worse at quickly switching between tasks, the Stanford scientists wrote.

After testing about 100 Stanford students, the scientists concluded that chronic media multitaskers have difficulty focusing and are not able to ignore irrelevant information.

Even if you learn while multi-tasking, that learning is less flexible and more specialized, so you cannot retrieve the information as easily.

When the subjects were asked questions about the cards afterward, they did much better on the task they learned without the distraction.

keeping up several e-mail and instant message conversations at once, text messaging while watching television and jumping from one website to another while plowing through homework assignments.

the researchers realized those heavy media multitaskers are paying a big mental price

Everything distracts them