There is some interesting research made into this:<p><pre><code>  Dietrich, A (2004) The cognitive neuroscience of creativity [1]
  Dietrich, A (2004) Neurocognitive mechanisms underlying the experience of flow [2]
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Both of these papers are easy to read.<p><pre><code>  [1] http:&#x2F;&#x2F;link.springer.com&#x2F;article&#x2F;10.3758&#x2F;BF03196731#page-1
  [2] http:&#x2F;&#x2F;www.sciencedirect.com&#x2F;science&#x2F;article&#x2F;pii&#x2F;S1053810004000583</code></pre>