The psychologists found that mice housed in a lighted room 24 hours a day exhibited more depressive symptoms than did similar mice that had a normal light-dark cycle.

心理学家发现，关在一天24小时灯火通明房间里的老鼠比关在按正常明-暗光线循环房间里的同类老鼠表现出更多的抑郁症状。

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This light-dark cycle is good for our bodies to predict changes in the environment.

这种光暗循环有助于我们的身体适应环境的变化。

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Objective To study the effect of different light-dark cycles on learning and memory in mice.

目的研究不同光暗循环周期对小鼠学习记忆的影响。

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In "Family of Man," a dark-haired, light-eyed woman with a bright blue head covering looks intensely at something hidden from view.

VOA: special.2009.11.20

Over the eight-week period of the experiment the mice in the first and third groups gained almost 50% more weight than those exposed to the natural light-dark cycle.

ECONOMIST: Obesity: The dark side of light | The

"The good news is that people who stay up late in front of the television and computer may be able to undo some of the harmful effects just by going back to a regular light-dark cycle and minimizing their exposure to artificial light at night, " Bedrosian says.

CNN: Unplug! Too much light at night may lead to depression

Peromyscus, too, comes in light- and dark-coat varieties as a result.

ECONOMIST: The genetics of mammoth coat colour