Nobody likes the idea of being irrelevant, and yet a growing incapacity to focus and control our attention is making us more irrelevant than ever.

What will you do about that?

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. […] 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. […] unfortunately, they’ve developed habits of mind that make it impossible for them to be laser-focused. They’re suckers for irrelevancy. They just can’t keep on task.

Clifford Nass, The Myth of Multitasking