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Brain folding provides researchers with an accurate marker to predict psychosis -- ScienceDaily

The researchers looked specifically at the structural relationship in the brain determined by the way that the brain is folded inside the skull, also known as gyrification. "The human brain is not the largest of the mammals -- elephants and dolphins have larger brains than we do, but our brain is much more folded than other species' brains, and that is because it is the most economical way to send signals across a constantly busy system," said Dr. Palaniyappan, noting that this folding pattern is mostly developed by the time a person is two years old.