"In the new study, the researchers assumed that the gray and white matter have similar stiffness, but different growth rates. Using mathematical simulations, they showed that depending on the size of the brain, their model results in different shapes of brain surfaces."
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Here’s How The Human Brain Gets Its Wrinkles
"The reason our brains have that wrinkly, walnut shape may be that the rapid growth of the brain’s outer brain — the gray matter — is constrained by the white matter, a new study shows.
Researchers found that the particular pattern of the ridges and crevices of the brain’s convoluted surface, which are called gyri and sulci, depends on two simple geometric parameters: the gray matter’s growth rate and its thickness. The development of the brain’s wrinkles can be mimicked in a lab using a double-layer gel, according to the study published today (Aug. 18) in the journal Proceedings of the National Academy of Sciences."
Link to study abstract: http://goo.gl/VHbk0d
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