Viewing and playing fantastical events does not affect children's cognitive flexibility and prefrontal activation.

Media exposure, such as viewing fantastical content, can have negative, immediate, and long-term effects on children's executive function. A recent study showed that watching fantastical content on a tablet can impair children's inhibitory control and prefrontal activation during the performance of a task. However, the same effect was not observed when children played fantastical games on a tablet. We aimed to replicate and extend this research by examining whether the same effects are observed during a cognitive flexibility task. In this study, preschool children (N = 32, 15 girls, Mean age in months (SD) = 60.6 (10)) viewed or played fantastical content on a tablet and performed a Dimensional Change Card Sort (DCCS) task before or after the media exposure. We assessed children's behavioral performance and prefrontal activation, as measured by functional near-infrared spectroscopy (fNIRS), and found no behavioral or neural changes after exposure. Our analyses using the Bayes factor supported the null hypothesis that children's cognitive flexibility is unaffected by watching or playing fantastical content.