Longitudinal relations of screen time duration and content with executive function difficulties in South Korean children

Abstract

ABSTRACT Research has consistently shown that excessive screen time (ST) is harmful to children’s cognitive development including executive function (EF). Most studies have investigated the long-term consequences of excessive ST and have not explored how content impacts cognitive development. Thus, the current study aimed to examine (1) the associations among the duration and content of ST and EF difficulties and (2) the interaction effect of ST duration and content on EF difficulties. A total of 1,484 third-grade children participated in the study and were followed up one year later. ST duration was measured by the average daily hours on smart devices and computers, and ST content was assessed by the extent to which children engaged in educational or recreational ST. EF difficulties were measured by parental reports of their child’s EF-related behaviors. The results showed ST duration did not predict EF difficulties one year later. However, higher levels of educational ST predicted fewer EF difficulties. A significant interaction effect between ST duration and educational ST demonstrated the benefits of educational ST were not present in children with higher levels of duration. These findings provide a foundation to develop more practical, efficient, and specific ST guidelines considering both ST content and duration.