The classic symptoms in boys, which are better understood, are hyperactivity, impulsivity, and distractibility. We all sit somewhere on the continuum of these traits, but people with more severe symptoms appear to have different chemistry in the parts of their brains governing reward, movement, and attention. They may have trouble listening or sitting still, and they get distracted by external stimuli. Easily bored, they tend to be risk-takers, looking for charged activities that help flood their brains with the feel-good neurotransmitters like dopamine, serotonin and norepinephrine, which
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