In their paper "The weirdest people in the world?", Joseph Henrich, Steven J. Heine and Ara Norenzayan argue that:
- The scientific literature in the field of experimental psychology consists primarily of reports of experiments upon subjects who were handy and willing – namely, college undergraduates, who are "Western, Educated, Industrialized, Rich, and Democratic (WEIRD)".
- "...WEIRD subjects are particularly unusual compared with the rest of the species – frequent outliers ... [in] domains ... includ[ing] visual perception, fairness, cooperation, spatial reasoning, categorization and inferential induction, moral reasoning, reasoning styles, self-concepts and related motivations, and the heritability of IQ."
- "...we need to be less cavalier in addressing questions of human nature on the basis of data drawn from this particularly thin, and rather unusual, slice of humanity."