Researchers asked two sets of subjects to take IQ tests. One group had to check e-mail and respond to instant messages while taking the test. The second group just sat down and did the test without distractions. Surprise, surprise, the distracted group didn’t do as well on the test—10 points worse than the control group. In similar testing conditions, people intoxicated by marijuana had scores 8 points lower. So researchers drew attention to their study by noting that multitasking is worse for your ability to concentrate than getting stoned.
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I’m not at all surprised.
It’s the reason I still try very hard never to talk on my phone — even hands-free — when I’m driving. Our brains weren’t meant for all this multi-tasking. Focus is a good thing.