Can't listen to it right now, but this article: http://online.wsj.com/article/SB10001424052748703467304575383131592767868.html http://online.wsj.com/article/SB

Can't listen to it right now, but this article: http://online.wsj.com/article/SB10001424052748703467304575383131592767868.html http://online.wsj.com/article/SB1000142405274870346730457538... suggests that speakers of all these languages share the good spatial orientation abilities. Anyway it's true then that my argument doesn't hold. One should first verify if there is a subset of nomadic peoples that lack this language feature, and that they have poorer orientation abilities.