The vast majority of psychological studies recruit test subjects who are Western, Educated, Industrialized, Rich and Democratic – or "WEIRD." Which is... well, weird, given that these people represent a very small segment of the global human population, from a cultural standpoint. Reasons why psychometric testing is just bullshit.
How The Mind Really Works: 10 Counterintuitive Psychology Studies -- 1. Cognitive dissonance 2. Hallucinations are common 3. The placebo effect 4. Obedience to authority 5. Choice blindness 6. Fantasies reduce motivation 7. Brainstorming doesn't work 8. Don't suppress 9. Incredible multi-tasking skills 10. It's the little things