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Scientists at the University of Rio de Janeiro have been trying to figure out what accounts for the folds.
里約熱內盧大學的科學家試圖找出溝壑的成因。
One idea postulated that as brains evolve and the more neurons they have, the more folds are required to allow neurons to form connections.
其中一項理論推斷隨著大腦不斷進化，大腦的神經元越來越多，那么神經元相連需要的溝壑也越來越多。
But elephants have nearly twice as many folds in their brains yet have fewer neurons than we do, so that theory seems improbable.
不過，大象的大腦溝壑幾乎是人類的兩倍多，但神經元卻比人類大腦少，因此這項理論難以成立。
The researchers have, however, determined that how human brains fold follows the same physical principles guiding folds and creases resulting from crumpling a sheet of paper.
然而，研究學家從揉成團的紙中推論出，人腦形成溝壑與紙張折疊和起皺遵循同樣的物理規律。
That’s interesting because it enabled the scientists to reason that the two main factors determining a brain’s shape are the surface area and thickness of the outer layer cortex.
有趣的是，科學家推論出，大腦的形狀主要是由大腦皮層的表面積和厚度2個因素決定的。
The larger the cortex surface area, the more folds a brain will have. But greater thickness results in fewer folds.
大腦皮層的表面積越大，溝壑就越多。而厚度越大，溝壑就越少。
Same goes for a piece of paper.
紙張也遵循同樣的原理。
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