This difference reflects what I have called the “primate advantage”:’ because of the way a primate brain is put together, a much larger number of neurons fits into a cerebral cortex of similar size to that of a rodent—which is a major asset when volume is at a premium, as we’ll see later in this chapter.

Suzana Herculano-Houzel, The human advantage: a new understanding of how our brain became remarkable, Cambridge, Massachusetts, 2016, p. 70