Genetic determinists think that a couple generations of PMC people marrying other PMC people will produce a new subspecies or some shit. Like bruv even ignoring how that's not really happening the way you think it is it takes a lot more than that.
One group of researchers has scrutinised the primate archaeological record and concluded that the human brain has evolved just as would be expected for a primate of our size.
The study examined ring-tailed lemurs, black-and-white ruffed lemurs and grey mouse lemurs, which differ in their social system, diet and brain size, not only among each other, but also compared to the previously tested Old World monkeys and great apes.
The results of the new study show that despite their smaller brains lemurs' average cognitive performance... was not fundamentally different from the performances of the other primate species.
This is even true for mouse lemurs, which have brains about 200 times smaller than those of chimpanzees and orangutans.
Isn't there some evolutionary pressure, and it could be that it applies to primates in general and not just humans, for big-headedness? Like if big-headedness didn't help, then you could imagine two populations, A and B, where A has big heads and B doesn't. B loses fewer mothers during childbirth. Those mothers can then give birth more times, making B grow faster than A, so after enough time, we're all medium-head B-people. But somehow we ended up with me not being able to hold my head up in baby pictures. What gives?