Studies show that adolescents with attention deficit hyperactivity disorder (ADHD) are heavier users of smartphones and video games, and the commonsense assumption is that people with ADHD are more likely to seek out the stimulation of screens and the enhanced focus that can be found in video games. But does causation run in the reverse direction too? Can a phone-based childhood exacerbate existing ADHD symptoms? It appears so.[49] A Dutch longitudinal study found that young people who engaged in more problematic (addictive) social media use at one measurement time had stronger ADHD symptoms
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