I’ll try to ELI5 this, but it’s a little complex.
The brain has bits which are of one of two ‘colours’ – white and grey. The white bits are in the ‘middle’, and the ‘grey’ bits are at the surface.
Most of your cognition (what makes you smart) is provided by the grey bits. The more grey bits (so, surface area) you have, the more you have to work with.
The white bits are mostly just myelinated axons – they play a supporting role to the grey ones – they help the grey boyz transfer information where they need it to go, help them out by ensuring they get enough blood and oxygen, etc.
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