Spending time online is normal behavior for teenagers. But too much Internet use by teens — or too little, for that matter — might be related to depression, a new study finds.

虽然上网对于青少年来说是很正常的行为，但是一项新调查发现，上网时间过长或者过短可能会导致抑郁。

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The study was released online in advance of publication in an upcoming issue of the journal Evolution and Human Behavior.

研究是在线发布的，发布在《进化和人类行为》杂志最新一期之前。

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Spending time online is normal behavior for teenagers. But too much Internet use by teens -- or too little, for that matter -- might be related to depression, a new study finds.

虽然上网对于青少年来说是很正常的行为，但是一项新调查发现，上网时间过长或者过短可能会导致抑郁。

youdao

Of the 22 sites, most did not contain any ads targeted to consumers based on their online behavior, according to the January study .

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Even if teens have not actually engaged in risky behaviors but merely brag about them online, this can still affect their future behavior, said study co-author Dr. Dimitri Christakis, professor of pediatrics at the University of Washington and director of the Center for Child Health, Behavior and Development at Seattle Children's Hospital.

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Every few weeks, it seems, I hear about a new study that reveals how online brand conversations are increasingly influencing consumer buying behavior.

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