The late Stanford professor Cliff Nass studied multitasking, and in 2009 Nass described how he and his colleagues were looking for multitasking activities at which multitaskers excelled.
In an interview with the PBS program, Frontline, Nass said, “We all bet high multitaskers were going to be stars at something. We were absolutely shocked. We all lost our bets. It turns out multitaskers are terrible at every aspect of multitasking. They’re terrible at ignoring irrelevant information, they’re terrible at keeping information in their head nicely and neatly organized, and they’re terrible at switching from one task to another.”
Translation: if you think you can multitask, you are delusional.