Endless Scrolling on Social Media Harms Your Children’s Minds

Cultural habits evolve faster than the brain structures that support them. While previous generations trained their intelligence through prolonged contact with text, younger generations grow up in a continuous flow of images, sounds and notifications. This daily shift, often imperceptible, profoundly modifies the mechanisms of attention and learning. Initial data now makes it possible to identify the effects of social networks on the cognitive abilities of adolescents.

A generation that reads less, but scrolls more

The incessant scrolling of news feeds has gradually replaced paragraphs. If this transformation of habits seems trivial, its consequences turn out to be more profound than we imagined. A recent study published in JAMA looked at the link between the frequency of use of social networks and the cognitive performance of 6,554 American adolescents, followed over several years as part of the large ABCD (Adolescent Brain Cognitive Development) cohort.

The researchers identified three distinct profiles according to the evolution of the time spent online: non-users or very weak users, moderate users, and those whose use has exploded over time. The observation is clear. Young people who spend one to three hours a day on the networks obtain significantly lower scores on reading, memory and vocabulary tests. By age 13, the heaviest users score up to five points lower than non-users on some standardized tests.

The effects of social networks can be measured from childhood

To understand how these effects take hold, we must go back to the beginning of adolescence, a key moment in brain development. Between the ages of 9 and 13, the brain goes through a phase of intense reorganization, during which it refines its information processing circuits. According to NPR, which relays the study's findings, this period represents a unique window of vulnerability. Prolonged exposure to fast and rewarding digital stimuli could slow down the maturation of concentration, memory and language skills.

The effect is called “dosage-dependent”. The more time spent on networks, the more cognitive performance declines. Even moderate use (about an hour per day) is enough to produce a measurable drop in scores. These gaps, seemingly modest, could widen over time and have a lasting impact on the academic and intellectual trajectory of adolescents.

Can we protect cognitive development without cutting the digital link?

Banning screens is no longer a realistic solution. Social networks are an integral part of adolescents' socialization mechanisms, and their benefits are not negligible. According to the Pew Research Center, a majority of young people agree that these platforms strengthen friendships and provide a space to express themselves. But these same adolescents are also more and more likely to say that they spend too much time online and that this harms their sleep, their productivity, and even their academic results.

This tension thus reveals a mutation in progress. The adolescent brain, hypersensitive to social rewards, adapts to the logic of likes and notifications. Another study, published in JAMA Pediatrics, shows that young people who compulsively consult their applications have increased brain activity in areas linked to reward and social anticipation. This neurological remodeling takes place from the age of 12, when the circuits controlling impulsivity and strategic thinking are not yet mature.

Faced with this observation, certain countries are taking the lead. Denmark plans to ban social media for under-15s. Australia will require, from December 2025, that platforms prevent minors under the age of 16 from opening an account without authorization. For Sheri Madigan, professor at the University of Calgary and co-author of an editorial in JAMA, these measures reflect a political urgency. The need to regulate an ecosystem that shapes minds even before they have reached their full critical capacity.