The data also showed that kids who spend more than two hours a day on screens score worse on language and reasoning tests.
Researchers have found "different patterns" in brain scans among children who record heavy smart device and video game use, according to initial data from a major ongoing US study.
The first wave of information from the US$300mil (RM1.2bil) National Institute of Health (NIH) study is showing that those nine and 10-year-old kids spending more than seven hours a day using such devices show signs of premature thinning of the cortex, the brain's outermost layer that processes sensory information.
