3.4 Multiple Ways of Making a Cortex

summary

There are multiple ways for cortical volume to occupy three-dimensional space and this varies across species.
In turn, there are also multiple ways to distribute cortical neurons in three-dimensional space.
Larger cortices are not necessarily more folded than smaller ones.
The degree of folding of a cortex is subject to physical principles: folding increases as the effective free energy of the growing volume and its surface is minimized.
Cortical folding scales universally with surface area and thickness. Folding is not dependent on the number of neurons.