can't focus on one activity.And “those people turn out to be the worst at handling different things，” said David

　　Sanbonmatsu, a psychologist at the University of Utah.

　　Sanbonmatsu and his colleagues gave the students a set of tests and asked them to report how often they multitasked, how good they thought they were at it, and how sensationseeking (寻求刺激) or impulsive (冲动)they were.They then evaluated the participants' multitasking ability with a tricky mental task that required the students to do simple mathematical calculations while remembering a set of letters.

　　Not surprisingly, the scientists said, most people thought they were better than average at multitasking, and those who thought they were better at it were more likely to report using a cellphone while driving or viewing multiple kinds of media at once.But those who frequently deal with many things at the same time were found to perform the worst at the actual multitasking test.They also were more likely to admit to sensationseeking and impulsive behavior, which connects with how easily people get bored and distracted.

　　“People multitask not because it's going to lead to greater productivity, but because they're distractible, and they get sucked into things that are not as important，” Sanbonmatsu said.

　　Adam Gazzaley, a researcher at the University of California, San Francisco, who was not a member of the research group, said one limitation of the study was that it couldn't find out whether people who start out less focused tend toward multitasking or whether people's recognizing and understanding abilities change as a result of multitasking.

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