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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It is about density. The more brain matter you have the more neurons you have. A wrinkly brain can fit more mass in the same volume. Imagine you had a ball of dough and had to fit it in a box. If the ball of dough is as big as the box it can remain smooth, but if you wanted to fit a bigger ball of dough in the same box you’d have to squish it in and it would get wrinkly.
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