When one gets past the hurdle of whether or not defined personality types even exist, it becomes easier to embrace a brand new study in the scientific journal Nature Human Behavior. Here, scientists break down humans into four personality types based on “five different major character traits, including neuroticism, extraversion, openness, agreeableness and conscientiousness,” according to Time. Co-author Luis Amaral, a professor of chemical and biological engineering at Northwestern University, and postdoctoral fellow Martin Gerlach, sorted through 1.5 million answers to four different personality surveys. Participants were all ages and stretched across the globe. Head over to Time to learn more about what each personality type embodies.