[tilt_error]

There is some interesting research made into this:

  Dietrich, A (2004) The cognitive neuroscience of creativity [1]
  Dietrich, A (2004) Neurocognitive mechanisms underlying the experience of flow [2]

Both of these papers are easy to read.

  [1] http://link.springer.com/article/10.3758/BF03196731#page-1
  [2] http://www.sciencedirect.com/science/article/pii/S1053810004000583