As I understand it the whole mechanism itself depends on individual growth. When the cortex grows it demands more space. If faced with limited space it will start folding and crumpling. But then there has to be a reasonable balance between the growing cortex and the much slower growing cranium or else the cortex can only fold so much within that confined space. Key word is scaling. Think of it like putting your toys neatly into a box instead of dumping everything in. You make use of the space more effectively by trying to put the toys next to each together but ultimately you are still limited by the box size.
The opposite can also be said, a larger skull would allow more space for the brain to grow and an even larger surface area when folding occurs, assuming the same scaling applies.
As I understand it the whole mechanism itself depends on individual growth. When the cortex grows it demands more space. If faced with limited space it will start folding and crumpling. But then there has to be a reasonable balance between the growing cortex and the much slower growing cranium or else the cortex can only fold so much within that confined space. Key word is scaling. Think of it like putting your toys neatly into a box instead of dumping everything in. You make use of the space more effectively by trying to put the toys next to each together but ultimately you are still limited by the box size.
The opposite can also be said, a larger skull would allow more space for the brain to grow and an even larger surface area when folding occurs, assuming the same scaling applies.