They cited a smaller 2003 Norwegian study that found I.Q. increases at age 4, although no cognitive benefit was seen in infants or 7-year-olds.

他们引用了一项对2003个挪威人的研究，该研究发现，虽然孩子在婴儿期或7岁时没有认知能力的获益，但四岁时智力会提高。

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In a six-week study, experts found people who played online games designed to improve their cognitive skills didn't get any smarter.

在一项为期六周的研究中，专家发现，以提高玩家认知能力为目的的网络游戏并没有使玩家变得更聪明。

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Black tea can help you concentrate. A study at the University of Northumbria found that caffeine and L-theanine in black tea leaves improves cognitive skills.

饮用红茶可以帮助您的注意力得到集中，因为红茶里面的咖啡因以及茶氨酸可以改善大脑的认知功能。

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For example, the study found that whites were more likely than blacks to maintain their cognitive function with age.

CNN: Experts reveal best ways to save an aging brain

In a study published in the journal Social Cognitive and Affective Neuroscience in 2011, researchers found that exposure to another person's stress sweat sharpened alertness.

WSJ: Why We Sweat When We're Stressed