Psychologist Jonathan Cheek, along with graduate students Jennifer Grimes and Courtney Brown, wanted to explore these differences. They hypothesized that there are different types of introverts, or in other words, different ways in which a person’s introversion can be expressed. They surveyed about five hundred adults of various ages, asking them about their preferences for spending time alone, how likely they were to daydream, etc. They came up with four types of introverts: social, thinking, anxious, and restrained. They named their model “STAR,” after the first letter of each type.
