Brain white matter characteristics influence screen time impact on youth

A joint research team from Korea University Guro Hospital, Seoul National University Hospital, Seoul National University, and UNIST has found that the relationship between screen time and inhibitory control in children and adolescents varies based on the microstructural characteristics of brain white matter.

Analyzing 150 participants aged 7 to 17, the study utilized Diffusion Tensor Imaging (DTI) to evaluate eight white matter pathways. The researchers found that higher screen use scores—covering activities such as video games, social media, and streaming—were generally associated with lower inhibitory control, as measured by the Stroop Color and Word Test.

Crucially, the study identified that the integrity of the right superior longitudinal fasciculus I/II may act as a buffer. In adolescents with relatively lower fractional anisotropy (FA) in this specific pathway, the link between high screen use and decreased inhibitory control was distinct. However, in those with higher FA levels, no statistically significant correlation was observed.

While the findings suggest that individual brain structure may influence how screen time affects cognitive functions, the researchers noted that this study does not prove direct causality or a definitive protective effect. Further long-term follow-up studies are required to confirm these relationships.