[tikhonj]

This makes sense for investing where you actually make decisions about what to invest in. I'm completely guessing, but it is probably different for quantitative finance where rather than investing yourself, you come up with a strategy and follow or even automate it.

Of course, that also requires more than just intelligence--you won't get far without the discipline to test everything thoroughly and to follow the strategy even if it loses money in the short term.

Also, I imagine the two styles of investing require vastly different sorts of intelligence and are best suited to people of different temperaments. Making decisions about investments is very different from making decisions about how to make decisions about investments :P.