People who do it the most are actually the worst at it.
PROBLEM: With the exception of texting while driving, which is absolutely deplorable, the ability to juggle multiple tasks at once is generally seen as impressive and, despite the fact that research suggests it actually makes it harder for us to process information, even necessary for getting by in modern society.
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METHODOLOGY: Undergrads at the University of Utah were asked to rate their own multitasking prowess on a zero to 100 scale, and then were put to the test: They had to memorize a sequence of letters interspersed with simple math equations. The researchers also evaluated their impulsiveness and sensation-seeking qualities, and asked them how often they used their phones while driving and how much time they spent using various types of media.
RESULTS: There was a negative correlation between multitasking ability and practice: Those who performed worse on the test were the most frequent multitaskers in real life. The subjects in the top 25 percent of performers on the multitasking test were also the least likely to multitask.
Meanwhile, 70 percent of participants rated themselves as above-average multitaskers. Not only was this a statistical impossibility, but those same people were also more likely to multitask, including driving while using their phones. They also scored high for impulsivity and sensation-seeking behavior.