Isn't it as simple as: to concentrate well - you need to remove distractions. Too much noise is distracting but, having zero noise is also distracting because i

Isn't it as simple as: to concentrate well - you need to remove distractions. Too much noise is distracting but, having zero noise is also distracting because inevitable something will cause noise and your attention will be drawn to it. Hence why white noise is so effective because it's the middle of these two things.