A study from the University of London, for example, found that members of the remote cattle-herding Himba tribe in Namibia, who spend their lives in the open bush, had greater attention spans and a greater sense of contentment than urbanized Britons and, when those same tribe members moved into urban centres, their attention spans and levels of contentment dropped to match their British counterparts. This should be t…
They basically controlled for everything, if you read the paper, except for the language used for colours, and showed how a colour that's incredibly distinct for us, is incredibly hard to distinguish for them and vice-versa.
Go here: https://vimeo.com/120808489 You need to find the odd colour out in the rings at: 5:40 (easy for them, hard for us) 6:30 (so easy for us that it's hard to imagine it being hard for anybody)