3.4 Multiple Ways of Making a Cortex
- 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.