Finnish Study Links More Screen Time to Better Cognitive Processing in Teens

A longitudinal study in Finland, tracking 260 children from childhood to adolescence, has yielded findings that challenge conventional wisdom regarding screen time. The eight-year study, which followed 124 girls and 136 boys until they were an average age of 15.8, found that greater screen time accumulation from childhood was associated with better cognitive processing in adolescence. The research, published in Pediatric Exercise Science and part of the PANIC study by the University of Jyväskylä and the University of Eastern Finland, suggests screen time might support cognitive development.

Petri Lenko, a doctoral student at the University of Jyväskylä who led the research, stated, "The findings suggest that screen time can support the cognitive processing of children and adolescents." He emphasized that the nature of the activities performed during screen time is likely crucial. The study employed both device-based measurements of physical activity and self-reported questionnaires, alongside a computerized cognitive test battery called CogState. This dual approach revealed discrepancies, with some correlations appearing only in self-reported data, suggesting public debate may rely heavily on subjective accounts rather than objective measurements.

While the central finding points to a positive association between more screen time and improved cognitive processing, the researchers caution against interpreting this as a causal link. They highlight that the sample size was relatively small and that results differed between self-reporting and device measurements. Furthermore, the study observed gender-specific differences: lighter physical activity in childhood correlated with better working memory in adolescent girls, while organized, guided physical activity was linked to better working memory in boys. An unusual finding indicated that less self-reported independent physical activity was associated with better cognitive processing, a link not found with device-measured activity.

The researchers do not advocate for increased screen time, instead suggesting a balance between physical activity and screen use that promotes active thinking, problem-solving, creation, and learning, rather than passive scrolling. They explicitly state that their findings show correlations, not causation, and that further intervention studies are needed. The study did not examine sleep, mental health, or social relationships, which are common concerns associated with prolonged screen use.

In the broader context, many studies continue to link heavy screen use in children to attention problems, poor sleep, and reduced physical activity, with global recommendations still advising limits on screen time for young children. The Finnish study adds a nuance, shifting the focus from the quantity of screen time to the quality of activities engaged in during that time. This is particularly relevant in Israel, where children are among the world's heaviest screen users, and discussions about phone use in schools are ongoing.