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Study: Depression Not Contagious, but Happiness Spreads Among Friends
情绪真的可以传染吗？
Researchers found that while depression does not spread among friends,
研究人员发现抑郁情绪不会在朋友之间传播，
happiness is contagious in circles of friends and may be the key to treating and preventing depression.
但积极健康的情绪却恰恰相反，而且这种正能量的“传染”是治疗和预防抑郁症的关键。
Using a mathematical model to study teenagers' influence on each other, researchers have found they can affect each other positively.
通过观察记录青少年日常交友情况后，研究人员发现：情绪确实能够相互传染。
Frances Griffiths, a professor at the University of Warwick, said in a press release,
华威大学的弗朗西丝·格里菲斯教授在一次新闻发布会上称，
"we've found that a healthy mood amongst friends is linked with a significantly reduced risk of developing, and increased chance of recovering from, depression."
“拥有足够多积极乐观的朋友则更易从抑郁中恢复过来或者降低患抑郁症的风险。”
Researchers gathered data from The National Longitudinal Study of Adolescent to Adult Health on the moods of 2,194 teenagers in 7th through 12th grade during the 1994-1995 school year.
研究人员从“美国青少年健康研究”中挑取了2194多名青少年和成年人（1994~1995年时正在念7年级和12年级）的成长记录，并对他们的相关数据加以分析。
