I came across the map shown below, and I found it very similar to the map that I included in my previous post on Language diversity: it has the same clusters in Papua New Guinea, Amazonia and northern South America, South East Asia and Equatorial Africa. But! it depicted another thing, "Tone diversity".
The website that published that map has a very interesting post: Phonemic diversity decays "out of Africa"? (April 16, 2011)
Yes, the red dots are higher in Africa, S.E. Asia and PNG, but none in north Asia or Europe, and quite a few in America. Regarding the pink dots, America has more than the putative cradle od Amerindians (Siberia) or Europe.
The blog is very good as it makes fun of the paper it is criticizing.
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