But, she added, “teens who are habitually checking their social media are showing these pretty dramatic changes in the way their brains are responding, which could potentially have long-term consequences well into adulthood, sort of setting the stage for brain development over time.” A team of researchers studied an ethnically diverse group of 169 students in the sixth and seventh grades from a middle school in rural North Carolina, splitting them into groups according to how often they reported checking Facebook, Instagram and Snapchat feeds.While carrying out the task, the frequent checkers showed increasing activation of three brain areas: reward-processing circuits, which also respond to experiences like winning money or risk-taking behavior; brain regions that determine salience, picking out what stands out in the environment; and the prefrontal cortex, which helps with regulation and control.It could be, he added, that the researchers are “picking up on the development of extroversion, and extroverts are more likely to check their social media.” He described the paper as “a very sophisticated piece of work,” contributing to research that has emerged recently showing that sensitivity to social media varies from person to person.“We’re not all the same, and we should stop thinking that social media is the same for everyone.” Over the last decade, social media has remapped the central experiences of adolescence, a period of rapid brain development.Experts who reviewed the study said that because the researchers measured students’ social media use only once, around age 12, it was impossible to know how it changed over time, or to rule out other factors that might also affect brain development."