Multitasking Is Cancelled

In today's busy world, multitasking is all too common. Juggling multiple tasks and responsibilities might seem like the best way to get a lot done, but as you have seen, trying to do more than one thing at a time can actually diminish productivity and performance. Focus on one task at a time, many experts suggest, in order to get the job done quickly and correctly...

 "We studied people who were chronic multitaskers, and even when we did not ask them to do anything close to the level of multitasking they were doing, their cognitive processes were impaired. So basically, they are worse at most of the kinds of thinking not only required for multitasking but what we generally think of as involving deep thought," Nass told NPR in a 2009 interview...

Experts also suggest that the negative impact of chronic, heavy multitasking might be the most detrimental to adolescent minds. At this age, in particular, teen brains are busy forming important neural connections.

Spreading attention so thin and constantly being distracted by different streams of information might have a serious, long-term, negative impact on how these connections form.
Your brain on multitasking.