In this lecture, I begin discussing the development of modern trait theory. Psychologists, expert in measurement and statistics, discovered extraversion, neuroticism, agreeableness, conscientiousness and openness to experience, and began the process of delineating their social significance and biological underpinnings. — SUPPORT THIS CHANNEL — Direct Support: https://www.jordanbpeterson.com/donate Merchandise: https://teespring.com/stores/jordanbp… — BOOKS — 12 Rules for Life: An Antidote to Chaos: https://jordanbpeterson.com/12-rules-… Maps of Meaning: The Architecture of Belief: https://jordanbpeterson.com/maps-of-m… — LINKS — Website: https://jordanbpeterson.com/ 12 Rules for Life Tour: https://jordanbpeterson.com/events/ Blog: https://jordanbpeterson.com/blog/ Podcast: https://jordanbpeterson.com/podcast/ Reading List: https://jordanbpeterson.com/great-books/ Twitter: https://twitter.com/jordanbpeterson Instagram: https://www.instagram.com/jordan.b.pe… Facebook: https://www.facebook.com/drjordanpete… — PRODUCTS — Self Authoring Suite: https://selfauthoring.com/ Understand Myself personality test: https://understandmyself.com/ Merchandise: https://teespring.com/stores/jordanbp…