The brain activity data collected from the volunteers in the sleep group showed that deep sleep (slow-wave sleep) helped strengthen their memories of new words.

从睡觉的那一组志愿者那里收集来的大脑活动的数据表明，深度睡眠(短波睡眠)帮助他们巩固了对词汇的记忆。

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They found that, once again, the older people felt sleepy at different times from the younger people and had different timings of slow-wave activity in the brain.

他们再次发现，老年人与年轻人在不同的时间犯困，并且大脑慢波活动的时段也不同。

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Thee slow-wave activity in the volunteers' brains was also measured several times during the day and night.

志愿者的大脑慢波活动同样在白天和晚上多次被测量。

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In earlier experiments, designed to replicate normal learning, Dr Tononi found that the part of the brain showing most slow-wave activity during sleep was the same as the part that had been activated during the experiment.

ECONOMIST: Memory formation