在这些老鼠断奶后，他们被放置在相同的光照周期中长达数周，或转换到相反的光照环境。
After they were weaned, they were kept in the same light cycle for several weeks or switched to the opposite one.
在这样的光照条件下进行8周的实验后，田鼠被测出来类似抑郁的症状。
After eight weeks in their lighting condition, the animals were tested for depression-like behaviors.
研究人员将老鼠放在光照下12小时，黑暗中12小时。在有光照的情况下，老鼠(喜欢在夜间活动)开始摄入更多的食物，这种现象早在第一周就表现出来了。
When kept in 12 hours of light and 12 hours of darkness the mice - which are nocturnal - began consuming more food when the lights were on as early as the first week.
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