Study Links Increased Screen Time to Improved Cognitive Processing in Adolescents

A recent study conducted in Finland has revealed an intriguing connection between screen time usage and cognitive performance among children, indicating that those who engage in more screen activities during their formative years tend to exhibit enhanced cognitive processing during adolescence. Dr. Petri Jalanko from the University of Jyväskylä cautions against viewing screen time as purely detrimental, advocating for a balanced approach that incorporates physical activity alongside screen use that fosters active thinking.

Low levels of physical activity among adolescents continue to pose significant public health concerns. Sedentary behaviors have been linked to poorer academic outcomes, while physical activity is recognized for its beneficial effects on brain function, particularly in adults. However, the relationship between childhood and adolescent physical activity and cognitive processing later in life is less understood.

The researchers analyzed how physical activity, sedentary behavior, and screen time from childhood through adolescence correlated with cognitive processing during teenage years, taking into account variations between genders and the intensity of physical activity. Results indicated that greater screen time initiated in childhood corresponded with improved cognitive processing during adolescence.

Dr. Jalanko noted, “The findings suggest that screen time can support children’s and adolescents’ cognitive processing. Presumably, the essential point here is what kind of things they do in their screen time. Teachers and parents should encourage children to use devices and screens in such ways that promote active thinking, problem-solving, creativity, and learning.”

Additionally, the type of screen activities appears to be crucial, as digital engagements that involve learning or problem-solving may help elucidate the observed association in the study. Dr. Jalanko emphasized the importance of balancing screen time and physical activity in ways that stimulate active thinking.

Gender Differences in Physical Activity

The relationship between physical activity and cognitive performance demonstrated complexity based on gender. Among girls, increased light-intensity physical activity since childhood was associated with enhanced working memory in adolescence. Conversely, boys exhibited a connection between greater involvement in guided physical activity and improved working memory.

Interestingly, the study found that lower levels of self-reported unsupervised physical activity correlated with better cognitive processing in adolescence. However, objective measures of physical activity and sedentary time—utilizing devices that tracked heart rate and movement—appeared not to connect with cognitive processing outcomes. This discrepancy may suggest that while these devices quantify movement, they do not accurately capture the nature of activities undertaken during those periods.

Dr. Jalanko remarked, “Our study indicates that the connections of physical activity and sedentary behavior to cognitive processing are complex and depend on sex, the type, and assessment method of physical activity and sedentary time. Moreover, boys and girls may benefit from different types of physical activity in view of brain health.”

The Need for Further Research

While the study’s findings reveal associations, the researchers stress that they do not establish direct causal links between screen time or specific types of physical activity and cognitive performance. Dr. Jalanko asserts, “However, we need more intervention studies to find out causal relations and sex differences in this respect. Moreover, it is important to examine more specifically the effects of the intensity of physical activity on changes taking place in cognitive processing.”

The current analysis stems from an eight-year follow-up of the PANIC study, which focused on children’s physical activity and nutrition, involving 124 girls and 136 boys with an average age of 15.8 years. Researchers employed both survey questionnaires and devices to measure physical activity and sedentary behavior, while cognitive aspects such as learning, attention, and working memory were assessed using the CogState test battery. The research findings were published in the journal Pediatric Exercise Science.