The fact that electricity or head trauma (i.e. blunt instruments) have improved creative output in some individuals suggests to me that many of us may be unwittingly inhibiting our creativity. If so, how and why?
Now the brain is ruthlessly efficient when it comes to not do things that are not rewarded. Beeing creative means having tons of such connections missfire- and if you do not reward that process over time, by following some of the more plausible misfires- your brain will reduce that behaviour.
Conciously rewarding these missfirings, and not supress them by filtering out "irrelevant nonsense because we already have a ideal procedure" is a way to train for more creativity.