雅思閱讀材料：缺覺對大腦的損害等于頭部受重擊

Ever feel like you’ve been hit on the head after a bad night’s sleep? According to scientists, the thought isn’t as far-fetched as it seems.

如果晚上沒睡好，第二天會不會有種撞過頭的感覺?據(jù)科學家研究，這種想法和實際情況相差不遠。

A study found going without sleep for just one night causes changes in the brain similar to those that occur after a blow to the head.

一項研究發(fā)現(xiàn)，即使只通宵一晚，對大腦造成的損傷足以抵得上對頭部的一次重擊。

The researchers said the healthy young men examined in the study showed a spike in the same chemicals which indicate brain damage.

研究人員說，研究中接受檢查的健康年輕人顯示出一種會導致腦損傷的化學物質(zhì)劇增。

Professor Christian Benedict, of Uppsala University, Sweden, explained that the chemcials NSE and S-100B are biomarkers for brain damage, such as concussion.

瑞典烏普薩拉大學克里斯蒂安·本尼迪克特教授解釋說，化學物質(zhì)NSE和S-100B是腦損傷(比如腦震蕩)的生物標記。

He said: ‘What we found was their levels in the blood rose in the group that went without sleep for a night. This was not to the extent that would happen after a head injury, for instance, but it was still significant.

他說：“我們發(fā)現(xiàn)的是在一晚沒睡的人群中，NSE和S-100B在血液中含量上升了。這雖然還不到一次頭部外傷的程度，不過也很值得注意了。”

‘During sleep, the brain cleans itself of toxic substances and NSE and S-100B increase in response to these substances.’

“大腦通過睡眠來清除自身的有毒物質(zhì)，NSE和S-100B則對這些物質(zhì)做出反應”。

He said the findings back up previous research showing how the brain uses sleep to cleanse itself.

他說這項研究支持了之前的研究結果，即大腦怎樣用睡眠來自我凈化。

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