Likewise, top Starcraft players require immense manual dexterity which can only be developed to a certain extent.

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And not every person has the eyesight or manual dexterity to do so.

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The study included 83 patients who had strokes at least six months before they entered the trial and had chronic deficits in their ability to walk, motor and sensory function, and manual dexterity.

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"We check their manual dexterity, " says Nakamura.

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