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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Your brain is folded in order to increased the amount of neurons and axons (as well as connections, which could be more important than the other two) that can fit via available surface area. A more wrinkled brain and higher density of neurons is correlated with more complex thought in mammals. Of course, this is mainly with mammals.
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