Thanks, CFK. This is exactly what I'm wondering.

Since PS and WM are on an IQ test, the assumption--rightly or wrongly there!--is that they're something innate.

But then again, there's a whole industry built up around "improve your memory" and "speed reading" and those sorts of WM and PS sorts of things.

I know you can improve your ability to remember things if you use mnemonics and such, and you can do things faster if you practice them, so I guess I don't believe that WM and PS are completely innate. Or am I misunderstanding the whole concept there? Maybe it's the difference between achievement testing and IQ testing? You can do better if you work harder, but you can't change what nature gave you?

Kriston