I agree with Kmguru.
I also am going to show something with my (Not too brilliant) diagrams
Firstly we have the "Humans only use 10% of there brain, and what do we use the rest for?"
Well the first thing that pops into a persons mind when they hear 10% is something solid, a 10th of a whole. We tend to characterise it as whole.
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This perception is of course in error, We don't use a chuck of our brain thats assigned to 1/10th of the whole. Our processes bounce through the brain and at any given point could take up 10%. This means the image we should see is like this:
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Of course the reason why our processes allow a bit of room between each other is so they don't conflict with each other.
I'm sure if any of you have used a Windows operating system prior to 2000 and XP you should be aware of the Blue screens of Death.
They are caused because windows isn't very good at managing it's memory, so a program will ask it to hold some information in the memory, and windows will assign it the memory it's using to run your video output, or sound and suddenly you have two processes trying to use the same area causing not just a conflict but an operation error.
(Of course in my diagram the crossing over, doesn't symbolise that they run through the same neuron, but go above or below the line.)
I would hesitate a guess that the brains impulses give out an energy surge that also inhabits through nonlocality in nearby neurons also, which means that there would have to be ample space or they would cause conflictions of thought.
Thus the reasoning to why we only use 10% of our brains.