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 a density thing. Think of the wrinkles in the brain being like an air filter.
Those cheap fiberglass air filters work, but they’re really not the best. The folded paper ones are significantly more effective as they have far more surface area to collect debris.
The more wrinkles in the brain the more surface area there is for neurons.
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