The other day I stumbled across this article on Slate that talks about how, in the current scientific view, differences of skill in individuals relate to practice and other factors. It presents some interesting studies and data about the amount of deliberate practice different chess players needed to become masters, shows how not all practice is effective and some other interesting stuff:

For example, the number of hours of deliberate practice to first reach "master" status (a very high level of skill) ranged from 728 hours to 16,120 hours. This means that one player needed 22 times more deliberate practice than another player to become a master.

What's not surprising for me (but apparently is for some people) is that, according to the article, the current scientific consensus is that people do have genetic predispositions that may set them apart from others in terms of abilities (what I'd call natural talent):

There is now an overwhelming scientific consensus that genes contribute to individual differences in abilities.

Then it moves on to the social effects of this realization, that pretty much lead to what Mr. Huxley had predicted in 1933 (but at a much faster pace).

Because Quake requires so many different abilities to play at high level, it could be interesting to have a survey of how the different factors affect players results and how much practice (and of what kind) each one needs to get to top form. :)