image: A series of crumpled paper balls made of stacks of 1, 2, 3, 4, 6 or 8 sheets of A4 paper. The series illustrates how the increasing thickness of the surface subjected to pressures results in progressively less highly folded paper balls, similar to a cerebral cortex of constant surface area but increasing thickness across species. This material relates to a paper that appeared in the July 3, 2015 issue of Science, published by AAAS. The paper, by Bruno Mota at the Universidade Federal do Rio de Janeiro in Rio de Janeiro, Brazil, and colleagues was titled, 'Cortical folding scales universally with surface area and thickness, not number of neurons.' view more
Credit: [Credit: Suzana & Luiza Herculano-Houzel]