According to an evolutionary-psychology theory that a person’s “life strategy” slows down or speeds up depending on the person’s surroundings, exposure to a “harsh and unpredictable” environment leads to faster development, while a more resource-rich and secure environment has the opposite effect, the study said.

In the first scenario, “you’d have a lot of kids and be in survival mode, start having kids young, expect your kids will have kids young, and expect that there will be more diseases and fewer resources,” said Twenge, a psychology professor at San Diego State University who is the author of “iGen: Why Today’s Super-Connected Kids are Growing Up Less Rebellious, More Tolerant, Less Happy — and Completely Unprepared for Adulthood.”

图片发自简书App

图片发自简书App