Eureka!

The part of the brain where insight occurs is the anterior superior temporal gyrus. During a flash of insight the left side doesn't really react, but the right side does. High-energy brain waves called gamma-waves erupt from this one spot.

Intelligence and creativity are not isomorphic. There is overlap between the two, but they are very different. It's wrong to think that brain structure alone makes you creative, but there is a neurological basis to divergent thinking - to creativity itself.

 

The Divergent thinking test, as in diverging from known ideas to come up with something novel, is one of the most commonly used creativity tests. An example would be to give someone a common object, such as a brick, and then ask them to think of as many creative ways to use the item. It gets people thinking outside the box.

Mind wandering seems to facilitate the creativity process. If you want to come up with a solution to a problem - don't do anything, but instead do something undemanding. If your stumped, take a break and let the mind wander.

Alpha waves help cut off distractions, helping you to summon the idea. A transient dip in frontal lobe activity aids the creativity and insight process. So, insight (the Aha! moment) essentially comes from cutting yourself off from the distractions of the outside world.

With a dissertation in the offing (and not an iota of what to do it on) it's beginning to look as though I'll have to lock myself in a room until I retrieve this moment of clarity.                         

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If you're not prepared to be wrong, you'll never come up with anything original

~ BBC Horizons: How insight works