"in heavy media multitaskers because they have a higher probability of experiencing lapses of attention. When demands are low, they underperform. But, when the task demands are high, such as when the working memory tasks are harder, there’s no difference between the heavy and light media multitaskers.

I'm surprised no one brought this up. This seems to indicate that it's possible that multitasking only effects tasks that aren't very important or hard, and that they have no trouble concentrating on tasks which require involvement. Seems to be an argument here that heavy multitasking isn't nearly as bad as the rest of the article makes out?