I believe many parts of the brain have their own fitness level. One that's trainable and when it's been trained well and given sufficient rest it helps you do great things. Among other areas I'd include memory and concentration as key areas in this.
If this is true then it would correlate with computers. It's well understood that as memory improves applications can grow and become smarter. Though this must be coupled with the ability to manipulate information much faster. Otherwise they'd be smart but slow. Fascinating how things relates improvements in computer capabilities with improvements in human capabilities. Key point is that humans have a lot of space to store and link information and can do it very quickly.
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