FLATOW: Yeah, but there are people who say, you know, I'm great at multitasking. I can - I have no problem with this. What do you say to that?
NASS: The research is almost unanimous, which is very rare in social science, and it says that people who chronically multitask show an enormous range of deficits. They're basically terrible at all sorts of cognitive tasks, including multitasking. So...
(LAUGHTER)
NASS: ...in our research, the people who say they're the best at multitasking because they do it all the time. It's a little like smoking, you know, saying, I smoke all the time, so smoking can't be bad for me. Unfortunately, it doesn't work that way.
FLATOW: And it's quite noticeable on tests. You can actually test for that and see the differences going on.
NASS: Yeah. It's...
FLATOW: Yeah.
NASS: Mm-hmm. Yeah. So we have scales that allow us to divide up people into people who multitask all the time and people who rarely do, and the differences are remarkable. People who multitask all the time can't filter out irrelevancy. They can't manage a working memory. They're chronically distracted.
They initiate much larger parts of their brain that are irrelevant to the task at hand. And even - they're even terrible at multitasking. When we ask them to multitask, they're actually worse at it. So they're pretty much mental wrecks.
(LAUGHTER)
FLATOW: Wow. But they don't think they are.
NASS: No. You're...
FLATOW: And that's the danger, right?
NASS: That's right. No, they actually think they're more productive. They actually think they tend to - and most notably, they think they can shut it off, and that's been the most striking aspect of this research.