Downstairs there's a cabinetlike device with inflatable plastic sacks to stimulate muscles and calm hyperactive children.

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The so-called cognitive-enhancing drugs include those originally made for dementia patients and hyperactive children.

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For his control, Dr Griffiths decided to use methylphenidate hydrochloride, otherwise known as Ritalin, a drug that calms hyperactive children.

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Laura's and Karen's experiences echo the findings of a trial in north Wales, which showed that Incredible Years reduced anti-social and hyperactive behaviour in children and improved their self-control.

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While still a student, he became increasingly successful as a recreational therapist for hyperactive and brain-damaged children.

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In the other, published in the Lancet in 2007, preschool and grade-school children seemed to be more hyperactive when given a juice drink with these same additives than they were after consuming an otherwise identical, additive-free drink.

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