I went back to the Dodecad Project K7b and K12b calculators, and calculated f4 statistics of the form:
f4(Southern_K7b, X, East_Asian_K7b, African_K7b)
I wanted to see how the various components related to East Eurasians.
Here are the results:
Visually for the West Eurasian components:
This shows the relative ordering of the different components on the East Asian-African axis. Notice that of the mainly Caucasoid components the most Asian-shifted is the North European component, the most African shifted is the Southwest Asian one. This makes sense because of the admixture phenomenon I've been describing in this series, and also the proximity of Arabia (which is where the Southwest Asian component is modal) to Africa.
The existence of East Eurasian-like admixture in Europe is further supported by the following observation: both the Atlantic_Baltic and North_European components (who are the most East Asian-shifted) are mainly geographically distributed to the west of the West Asian, Caucasus, and Gedrosia components (who are less East Asian-shifted). This seems discordant with geography. On the other hand, the relative position of the Caucasus, Southern, and Southwest Asian components vis a vis Africa are concordant with geography, as their center of distribution is close to Africa along land migration routes, with Southwest Asia being closer both genetically and geographically, and Caucasus most distant.
Another observation is that the Atlantic_Med component, which is modal in Sardinians and Basques is actually Asian-shifted relative to the Southern component (modal in Arabia).This might indicate the presence of some degree of East Eurasian-like admixture in Sardinia itself. So, while Sardinia may possess the minimum of this element in Europe, it may not do so in the wider Caucasoid world.
Unscrambling the omelette of West Eurasian origins is no easy task. Hopefully, new statistical methods and ancient DNA will help us achieve it.