What's more is that Clifford Nass, a researcher at Stanford assumed that those who multitask heavily will nonetheless develop some other outstanding skills. He thought that they will be amazing at 1. filtering information, 2. being very fast at switching between the tasks and 3. keeping a high working memory.
He found that none of these 3 points are true:
We were absolutely shocked. We all lost our bets. It turns out multitaskers are terrible at every aspect of multitasking.
People who multitask a lot are in fact a lot worse at filtering irrelevant information and also perform significantly worse at switching between task, compared to singletaskers.