影视风云路

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

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.”。    为了帮助实现这一目标，来自英国六所大学的小组将在西蒙斯天文台工作，该天文台位于智利阿塔卡马沙漠上方53000米的Cerro Toco。这个天文台有一个巨大的20英尺望远镜，以及三个可以测量宇宙微波背景的小型仪器。宇宙微波背景(CMB)本质上是我们宇宙诞生时留下的热量。但揭开宇宙最初时刻的秘密的探索不会就此停止。英国研究人员还将建造两个额外的望远镜，这应该有助于进一步提高天文台仪器的灵敏度。

B | 宇宙最初的时刻究竟是什么样子还不清楚，尽管随着宇宙的膨胀，它将迅速改变。这就是这项研究如此重要的原因。因为如果我们能够理解那些关键的最初时刻，也许科学家们可以更深入地了解宇宙在开始的那几秒钟之后如何继续形成。

C | 而且，从那里，也许像詹姆斯-韦伯太空望远镜这样的仪器可以比我们以前看得更深，特别是如果我们为这些数据开发出新的模型。最终，理解和重现宇宙最初的那些关键时刻，将是科学家们要克服的一个主要障碍。

D | 但是，如果他们能够做到这一点，它有可能解开关于我们宇宙的更多数据。

E |

Current article:http://8arg0k.yizhougengcuohei.cyou/nva/20260826/608284.html

Published on:00:00:00