@cian Suzana Herculano-Houzel claimed that a distinctive feature of primate brains is that the scaling rules are different from other mammals, as neurons become numerous, they become smaller. Log-log linear? (I can't remember details). However, I've noticed a few headlines in science daily recently about possible advantages of bigger neurons (eg in those that age better than others, if my aging brain correctly recalls). Anyway, size and space are related.

@LucCogZest @cian Yes, we do indeed have bigger neurons than other primates, and bigger dendritic trees on the pyramidal cells. But as I explain in my recent book (chapter 9) I don't think that it is these differences that account for the difference in intelligence between us and other primates.