In 2025, a review in PMC analyzed data from multiple studies, including the 2022 ABCD Study with 2,217 kids aged 9-10, using brain scans and behavior tests. It found excessive screen time, especially with reward-heavy games on devices like iPads, triggers dopamine overload, making kids crave instant gratification and struggle with everyday tasks. Kids with over 2 hours daily showed higher attention problems and depression scores, with brain scans revealing lower caudate nucleus activity (a reward area), hinting at addiction risks, and reduced prefrontal cortex function, linked to poor impulse control and increased aggression.