I've been reading into Anders Ericssons work on expertise and as made popular by Malcom Gladwell(though quoted incorrectly) is the requirement of accumulating large amounts of "deliberate practice"(Practice with a specific goal in mind with adequate feedback). I was also looking into Daniel Coyle's work on skill development and he follows a sort of similar theory in the sense that he does agree with deliberate practice, but puts more of an emphasis on "reaching" which can be defined as practicing and pushing yourself slightly outside your abilities with every practice session.
I don't see a reason to disagree with the above, but I pose another question which is how does one achieve consistency in the above described practice, which is usually tiring and require discipline (sometimes the mood just doesn't strike us to practice much less practice at the edge of our abilities).
My theory is that those who persist and are consistent in their practice over a long period of time in pursuit of expertise either deliberately or not have a reward system(Something releases dopamine as a result of practicing). It seems reasonable that people are only motivated to do a task where there is a positive correlation between reward and difficulty. So my question is how important is reward in your guys' opinion in achieving expertise? How can we add more reward to practice if it is important?