In one experiment, exposure to nature reduced reported symptoms of ADHD in children threefold compared with staying indoors. In another, she had 17 children aged eight to eleven with ADHD walk for 20 minutes with a guide in three different settings: a residential neighborhood, an urban downtown street and a park setting. After the park walk they performed so much better memorizing numbers in backward sequence that the improvement was equal to the difference between having ADHD or not having it, as well as to the difference between not being medicated at all and experiencing the peak effects of
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