This article does everything except actually answering the question in the title.
>Noise is necessary for our brains to function in an orderly fashion. In the book The Signal and the Noise, Nate Silver says that “The signal is the truth. The noise is what distracts us from the truth.”7 Andrew Smart adds that “there are many circumstances in which the addition of the right amount of noise actually boosts the signal.” So within the randomness of the noise, we can achieve greater creativity as the randomness of evolution brings the best out of humans.