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Scientists Explain Why Taxing Mental Work Wears You Out_我的网站

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A | A team of scientists has discovered a likely explanation for why one may feel exhausted after engaging in intense cognitive work.,In their study, published in the Current Biology last week, the researchers argue that intense cognitive work, when it lasts for several hours, results in the buildup of potentially toxic byproducts in the prefrontal cortex part of the human brain, which then affects a person’s behavior.,“Influential theories suggested that fatigue is a sort of illusion cooked up by the brain to make us stop whatever we are doing and turn to a more gratifying activity,” Mathias Pessiglione of Pitié-Salpêtrière University in Paris, said as quoted in a news release by Cell Press. “But our findings show that cognitive work results in a true functional alteration—accumulation of noxious substances—so fatigue would indeed be a signal that makes us stop working but for a different purpose: to preserve the integrity of brain functioning.”,During the course of their research, the team employed magnetic resonance spectroscopy to monitor the brain chemistry of two groups of people during a workday, with one group performing easy cognitive tasks while the other engaged in more complex mental activities.,Only the latter group ended up exhibiting signs of fatigue, as well as a tendency to favor “options proposing rewards at short delay with little effort,” as the news release put it.,AmericasChild Survives After 7 Minutes Without Blood Flow to Brain During Surgery, US Cardiologist Reveals11 August, 16:41 GMT,Furthermore, members of that group had higher levels of glutamate in the synapses of the prefrontal cortex, leading the researchers to suggest that the accumulation of glutamate “makes further activation of the prefrontal cortex more costly,” and thus a mentally exhaustive workday makes cognitive control more difficult.,Unfortunately, there seems to be no fancy way to deal with this problem other than the tried and tested method that is probably as old as history itself.,“I would employ good old recipes: rest and sleep!” Pessiglione remarked. “There is good evidence that glutamate is eliminated from synapses during sleep.”。　　世界最大直径水下盾构隧道、国内首条穿黄单洞双层盾构隧道——济南黄岗路黄河隧道于8月25日上午正式通车。这条隧道南起蓝翔中路，北接G309互通立交，全长约5755米，单洞双层布置，设计时速60公里。从“摆渡船”到5分钟穿黄，济南黄岗路黄河隧道通车首日获市民点赞　　通车后，济南主城区与新旧动能转换起步区之间的跨黄通勤时间从约40分钟压缩至5分钟，将有效缓解现有跨黄通道的交通压力，让市民从“绕行过黄河”变为“直通过黄河”，有力促进济南拥河发展，加快新旧动能转换起步区建设。值得一提的是，济南牌照(鲁A、鲁S)9座及以下小型客车可免费通行该隧道。

B | 从“摆渡船”到5分钟穿黄，济南黄岗路黄河隧道通车首日获市民点赞　　“我记得20世纪70年代初的时候穿越黄河靠的还是摆渡船，当时还有个铁路大桥，公路基本上没有。如今穿黄已经实现了四桥三隧，非常方便。”一位市民寻访团的市民代表告诉记者。据悉，由济南城市建设集团负责建设的“四桥四隧”工程已完成“四桥三隧”建设任务，济南航天大道黄河隧道(Ⅰ期)目前已双线贯通，跨黄通道正加速成网。从“摆渡船”到5分钟穿黄，济南黄岗路黄河隧道通车首日获市民点赞　　另一位市民代表马女士告诉新黄河记者：“我们作为第一辆车剪彩进入隧道后，看到路面非常平整、宽阔，车辆行驶起来非常平稳，也就用了4分多钟就穿越了隧道。记得在我小时候，需要乘坐公交车穿越黄河老桥绕行，如今真是方便多了。对于济南籍的小客车还是免费的，非常好。” 从“摆渡船”到5分钟穿黄，济南黄岗路黄河隧道通车首日获市民点赞　　向南，是济南主城区的繁华。