I’ve heard it explained as a density problem but that doesn’t make sense too me either because then wouldn’t having a smooth brain mean it’s more solid?
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The answer is that most of what you think is your brain is just wiring. Only the very surface layer is actual “gray matter” , the part that does the actual brain stuff. If your brain was smooth then the part of your brain that’s you , that’s doing the actual thinking, would be much smaller.
Imagine your brain is a computer chip that’s the size of a sheet of normal printer paper. Ok that’s about as big a sheet as would fit in your skull if it was smooth . But i could take a sheet of paper as big as a bed sheet and crumple it up and stuff that into your skull too. By crumpling and folding you get a much larger surface area and there for much more processing power.
There is another benefit too. Imagine again this huge sheet of paper on your bed. Now take a marker and mark two spots on the paper that are 4 feet apart. If your brain was smooth, a signal traveling from one mark to the other has to travel 4 feet. But if I crumple up the paper, those two spots could be right next to each other. Much faster to communicate
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