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Patricia Greenfield, one of the earliest researchers on video games, has pointed out, using media that train your brain to be good at dividing your attention appears to make you less able to carry out the kinds of deep thinking that require a calm, focused mind. Optimizing for divided attention means suboptimizing for concentrated attention.

Videogamers, in other words, seem to have a difficult time staying focused on a task that doesn't involve constant incoming stimuli.

The heavy multitaskers "have greater difficulty filtering out irrelevant stimuli from their environment" and are also less able to suppress irrelevant memories from intruding on their work. The heavy multitaskers were actually less efficient at switching between tasks - in other words, they were worse at multitasking.