Social media use may impact adolescent brain development -study

Social media platforms deliver a constant and unpredictable stream of social feedback in the form of likes, comments, notifications and messages.

Woman with smartphone is seen in front of displayed social media logos in this illustration taken, May 25, 2021. (photo credit: REUTERS/DADO RUVIC/ILLUSTRATION)
Woman with smartphone is seen in front of displayed social media logos in this illustration taken, May 25, 2021.
(photo credit: REUTERS/DADO RUVIC/ILLUSTRATION)

In one of the first long-term studies on adolescent neural development and technology use, researchers at the University of North Carolina at Chapel Hill found that adolescents’ brains could become more sensitive when anticipating social rewards and punishments over time with increased usage of Facebook, Twitter, Instagram, TikTok and other social media.

The study was published in JAMA Pediatrics under the title “Association of Habitual Checking Behaviors on Social Media With Longitudinal Functional Brain Development.” Psychology and neuroscience Prof. Eva Telzer, who was among the researchers, said: “The findings suggest that children who grow up checking social media more often are becoming hypersensitive to feedback from their peers.”

Tracking social media use

The team tracked 169 pupils recruited from public middle schools in rural North Carolina over three years. At the beginning of the study, participants reported how often they checked three popular social media platforms: Facebook, Instagram and Snapchat. Social media platforms deliver a constant and unpredictable stream of social feedback in the form of likes, comments, notifications and messages.

Their answers ranged from less than once to more than 20 times a day. Participants underwent yearly brain imaging sessions while completing the social incentive delay task, which measures brain activity when anticipating social feedback from peers.

Influencer posting social media (credit: AdobeStock)Influencer posting social media (credit: AdobeStock)

“While this increased sensitivity to social feedback may promote future compulsive social media use, it could also reflect a possible adaptive behavior that will allow teens to navigate an increasingly digital world,” said Maria Maza, a doctoral student in psychology and one of the study’s two lead authors.

“These social inputs are frequent, inconsistent and often rewarding, making them especially powerful reinforcers that can condition users to check social media repeatedly,” said Kara Fox, co-lead author of the study and a doctoral student in psychology.

Other studies have shown that 78% of 13 to 17-year-olds report checking their mobile devices at least hourly, and 35% of teens report using at least one of the top five social media platforms almost constantly. The study findings suggest that checking social media repeatedly among young teens aged 12 to 13 may be associated with changes in how their brains develop over a three-year period. The brains of adolescents who checked social media often – more than 15 times per day – became more sensitive to social feedback.

“Most adolescents begin using technology and social media at one of the most important periods for brain development during our lifetime,” said co-author Mitch Prinstein, who also serves as the chief science officer for the American Psychological Association. “Our research demonstrates that checking behaviors on social media could have long-standing and important consequences for adolescents’ neural development, which is critical for parents and policy-makers to consider when understanding the benefits and potential harms associated with teen technology use.”