On another note - Compared with the Neanderthals our brains have a much slower growth. But human brains have a slow and a steady growth. The divergence from Neanderthals, the humans evolved three unique protein mutations that slow down cell division during brain development. This steady pace, prevents chromosomal blunders when the neural cells divide duplicating DNA to another daughter cell.
Since we separated from Neanderthals, our species evolved 100 changes to our amino acids that nearly all of us share. Six of these changes affect cell division machinery.
So the human brains, seem to be uniquely protected from erroneous cell division compared to the Neanderthal brain. But whether it imparted to the improvement of our cognitive abilities are not known.