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I think the advantage that dolicocephals possessed was that dolicocephaly in North Europeans is actually a consequence of brain overgrowth induced by milk consumption. The lactose tolerant enjoyed a strong advantage in the country that was lost in cities; milk is hard to move.
The trend toward feudalization was probably more decisive than urbanization in the long run. Northwest Europeans preserved tolerance partly because of their low population density but also because they broke away from feudalism early and independent farmers drank more milk.
The benefical cognitive effects of milk consumption on IQ are mediated by brain growth: https://www.nature.com/articles/pr201066 … The growth itself was probably incidental to the large number of health benefits provided by a milk rich diet
So why, absent milk, do bracycephalics outcompete the longheads? Well, they're better at everything: they conserve heat more easily, have a higher ratio of brain volume to surface area, and it's easier to for a small, spherical head to stay symmetrical and pretty than a long one.
In my first post on Polynesia I passed along what Houghton had noticed: that Polynesians should have long narrow heads but instead have a polar brachycephalic type instead. A perceptive commenter noted that North Europeans saliently defy this trend.
Anthropologists have noticed the same anomaly, which is most true of the super-dolicocephalic Norwegians and Swedes. The interesting question about brachycephalization is not why it happened, but why it took so long to happen and why it never happened in the Swedes:pic.twitter.com/1Ff33n1X1b
Skull type is not just a physical quality, it has an impact on national character as well.
In dogs skull shape is the most powerful predictor of aggression, distinguishing ferocious Pitbulls from the dopey looking, innocent German Shepherds.https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3864788/ …
A junkyard dog hostility to foreigners is a famous Slavic tendency and this sharp difference from milkmen is maximally developed not in the genetically distant Russians but in the next door Czechs and Hungarianspic.twitter.com/LMJk56Vrf3
There a similar, but weaker trend toward xenophobia in the German speaking Alps as exemplified by….well you can figure it out.
One last famous Slavic stereotype relates to their good looks. Czechs are quite similar to East Germans genetically, but to me they’re the most foreign looking people in Europe, with elegantly spherical heads and thin, delicate bones.pic.twitter.com/zDW3LjmLs0
Somebody can demonstrate it statistically, but I think the Czechs produce more supermodels per capita than anyone else except maybe the Dutch, who have the major advantage of not looking “foreign”. They are purty:pic.twitter.com/macLUVizDW
The same combination of extreme good looks (Kim Kardashian and xenophobia (Mark Krikorian) can be seen in the recently brachycephalized peopled of the Caucasus.
The uniquely American film genre of a tough, white guy and a tough, black guy moving past their differences to solve some problem sort of works because both races have a shared dolicocephalic innocence.
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