For people who find it difficult to concentrate at work, some scientists suggest the problem is too few distractions [!!], not too many.
Scientists used to think that the act of concentrating itself might screen out distractions. But researchers such as Nilli Lavie at University College London [the sun truly never sets on the British Empire--always coming up with bright new ideas] believe that making a deliberate effort to concentrate isn't enough to filter out irrelevant information.
Instead, the brain becomes more engaged in tasks as the visual demands of the problem increase and effectively block additional stimuli. In practical terms, the research could be used to improve children's textbooks [or some certain college textbooks I can think of: for instance, the calculus text my father used when HE was in high school], or to add textured backgrounds or moving images to enhance dull slide presentations. [Or you could just have more interesting content?]