Driving for more than two hours a day negatively affects IQ levels, scientists have warned.

科学家警告称，每日驾驶时间超过2小时会对智商产生消极影响。

In what might come as unwelcome news for aged2″ target=”_blank”>middle-aged1 commuters, a recent study found that long periods behind the wheel could speed up the effects of age on the brain.

The researchers said that the results could be explained by the fact that the mind is less active on long car journeys.

The mammoth3 project saw more than half a million Britons aged 37-73 studied over a period of five years.

Out of these some 93,000 of them drove more than two or three hours a day.

Researchers found that not only did this proportion of subjects typically have lower brainpower to begin with but their IQ score declined more rapidly over the course of the study than those who did little or no driving.

Previous studies have found that long periods of inactivity have a detrimental4 affect on brainpower and Dr Bakrania’s research shows similar results for those who watched more than two hours of television a day.

But the study also found using computers actually boosted people’s cognitive5 stills, leading the scientist to propose another potential factor for driving’s negative effects.

‘Driving causes stresses and fatigue6, with studies showing the links between them and cognitive decline.’

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1 middle-aged UopzSS
adj.中年的
参考例句：
I noticed two middle-aged passengers.我注意到两个中年乘客。
The new skin balm was welcome by middle-aged women.这种新护肤香膏受到了中年妇女的欢迎。
2 aged 6zWzdI
adj.年老的，陈年的
参考例句：
He had put on weight and aged a little.他胖了，也老点了。
He is aged,but his memory is still good.他已年老，然而记忆力还好。
3 mammoth u2wy8
n.长毛象；adj.长毛象似的，巨大的
参考例句：
You can only undertake mammoth changes if the finances are there.资金到位的情况下方可进行重大变革。
Building the new railroad will be a mammoth job.修建那条新铁路将是一项巨大工程。
4 detrimental 1l2zx
adj.损害的，造成伤害的
参考例句：
We know that heat treatment is detrimental to milk.我们知道加热对牛奶是不利的。
He wouldn’t accept that smoking was detrimental to health.他不相信吸烟有害健康。
5 cognitive Uqwz0
adj.认知的，认识的，有感知的
参考例句：
As children grow older,their cognitive processes become sharper.孩子们越长越大，他们的认知过程变得更为敏锐。
The cognitive psychologist is like the tinker who wants to know how a clock works.认知心理学者倒很像一个需要通晓钟表如何运转的钟表修理匠。
6 fatigue PhVzV
n.疲劳，劳累
参考例句：
The old lady can’t bear the fatigue of a long journey.这位老妇人不能忍受长途旅行的疲劳。
I have got over my weakness and fatigue.我已从虚弱和疲劳中恢复过来了。

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