seems to me you see the 2 entities as having a boundary, and somewhat mutually exclusive. i see them as just different states in a cycle. (btw, have you read Pirsig's Zen and the Art of Motorcycle Maintenance?)
and that was a great link in the 1st post. (i immediately latched onto having to know what the author's world record was.... wow

). i came away in high agreement and thought the message was about being able to transverse the divides within the brain. and facilitating that through physical action (or at least removal from the academic style setting of the cubicle/classroom). his suggestion that the cerebellum was part of the cognitive process was new to me, as that wasn't how we learned it in high school 30 years ago. so that was cool.
paraphrasing one of my wife's inspirational ceramic plates that clog up our kitchen, playing games keeps us young. i agree, and believe that is because playing a game well demands us to bridge the crystal/fluid divide.
Very interesting comments. You've obviously given this question some careful thought.
No, I don't view them as mutually exclusive at all. One is totally dependent on the other, although they are probably inversely correlated with respect to age. It's just that as we learn more stuff, we don't need to use our fluid intelligence as much because we (or somebody else) have already figured out the stuff we needed it for it the first place. The balance begins to shift toward more crystalized thought because this is simply more useful in everyday life.
We need ways that stimulate our fluid intelligence it in order to regain some of what we've lost. Adding thousands of extraneous facts about playing pool, for example, does nothing to help us regain our fluid intelligence, and probably just hurts our game anyway.
Pool is really a simple game. Poke a ball at another ball and try to get that ball to roll down into a hole at the edge of the playing surface. Nothing is gained by knowing how to determine the duration and magnitude of the impulse between tip types - that is unless you are a tip manufacturer. Better to just empty your mind so you are free to focus on exactly how the ball is coming off the tip. I could come up with dozens of similar examples, but I'm sure you get my point.
The problem is, once you "know" something, it's pretty hard to "un-know" it at will (at my age I un-know all kinds of stuff against my will). Basically, it's stuck in there, and you will be unreceptive to ideas that may conflict with your prior knowledge. More importantly, though, the sum of all of these facts (pool and non-pool related) acquired over our lifetimes seems to diminish the amount of fluid intelligence we are able to tap into. So when the bad roll or or lock-up safety or other difficult problem comes up in the game, we will (theoretically) be less able to see a novel and intuitive solution.
What seems to be happening is a gradual decline in scores on the performance tests that psychologists use to evaluate fluid intelligence (which in and of itself is highly debated) as we get older. Kind of a "use it or lose it" phenomenon.
So, yes, your wife is correct IMO. Games do keep us young - both in spirit and, apparently, in the mind.
BTW I have read Pirsig's "Zen and the Art of Motorcycle Maintenance" twice.... and Herrigel's "Zen in the Art of Archery" numerous times. Guess which one I enjoyed the most?
