From the research paper: "It’s about another exotic group: people from Western, Educated, Industrialized, Rich, and Democratic (WEIRD) societies. In particular, it’s about the Western, and more specifically American, undergraduates who form the bulk of the database" 

The article seemed to blur the lines quite a bit; I thought the original question was justified and not worthy of downvotes. (why are we downvoting people that ask questions, or maybe, just maybe, misunderstood something?)