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Even though the study did not revolve around interruptions from cellphones or other gadgets, one researcher said the results provide a “clear extrapolation” to the impact of a stream of incoming rings and buzzes. “Technology provides so much more of an interference than what we did here,” said the researcher, Dr. Adam Gazzaley, a neurologist at the University of California at San Francisco. Indeed, the paper argues that studies like this are becoming increasingly important as aging adults spend more time in a work force with heavy multitasking demands.

the research shows instead is a “diminished ability” to reactivate the networks involved in the initial task.

A growing body of research shows that juggling many tasks, as so many people do in this technological era, can divide attention and hurt learning and performance. Does it also hinder short-term memory?

The big finding of a 2005 survey of Americans ages 8 to 18 by the Kaiser Family Foundation, co-authored by Roberts, is not that kids were spending a larger chunk of time using electronic media--that was holding steady at 6.5 hours a day (could it possibly get any bigger?)--but that they were packing more media exposure into that time: 8.5 hours' worth, thanks to "media multitasking"--listening to iTunes, watching a DVD and IMing friends all at the same time. Increasingly, the media-hungry members of Generation M, as Kaiser dubbed them, don't just sit down to watch a TV show with their friends or family. From a quarter to a third of them, according to the survey, say they simultaneously absorb some other medium "most of the time" while watching TV, listening to music, using the computer or even while reading.