talanov says that introverts are simply people who are more focused on details over big picture and global stuff, that's all.
Slightly dubious though. IMO it is precisely opposite: the typical indifference of introverts is due to how everything looks "meaningless in the bigger scheme of things", and the energy of extroverts is due to how they don't discriminate between things that are meaningful in the big picture and things that are not (eg. everything is given equal - and full - attention).

Smilingeyes also used to describe the introvert functions as "big-picture" functions (although he also linked these to systemacy and asking of "how" questions as opposed to "what").