They discovered that animals living in the enriched environment had higher levels of a protein called brain-derived neurotrophic factor (BDNF).

他们发现生活在复杂环境下的小白鼠有一种名叫脑源性神经营养因子（BDNF）的蛋白质水平较高。

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They found that young mice raised in an enriched environment -- with toys and other stimulation -- passed along the learning benefits to pups they had after they grew up.

研究人员发现，在放有玩具和其它刺激物的“高级”环境中成长的幼鼠会将它们的认知经验传给下一代。

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The answer has been lurking around in the scientific literature since the 1970's when Michael Kaplan reported that an enriched environment enhances the number of new neurons.

其实这个答案一直潜藏在科学文献中，70年代，卡普兰就报道了丰富的环境可以提高神经元的数目。

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Another group lived in what the researchers call an enriched environment up to 20 mice per cage,with toys, hiding places,and running wheels.

VOA: standard.2010.07.14

Matthew During's paper on how the mild stress of an enriched environment can change the production of hormones related to cancer growth is published in the journal "Cell."

VOA: standard.2010.07.14

lead author Matthew During of Ohio State University, described what happened after just three weeks, "And what was surprising to us was that the animals in the enriched environment, the cancers are 40 percent smaller" "When we moved that enrichment to six weeks,now, the cancers were approximately a dramatic effect,and not only that, but 17 percent of those animals had no tumors whatsoever."

VOA: standard.2010.07.14

Separate experiments compared mice that exercised on running wheels with mice exposed to an enriched environment.

WSJ: Why Young Children Don't Notice Coming Cars

One group was raised in an enriched environment filled with brightly colored toys.

WSJ: Why Young Children Don't Notice Coming Cars

Similar changes occurred in mice exposed to an enriched environment at an older age but only after eight weeks, they said.

WSJ: Why Young Children Don't Notice Coming Cars