摘要：成吉思汗...

小清新

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

一 | 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.”。

樊振东确认缺席2026年英国世乒赛，暂离国乒的决定，让这份宝贵的世乒赛参赛名额迎来新归属，小将温瑞博成为热门候选。这一名额绝非简单的人员递补，更不是赛场之外的照顾式馈赠，而是国乒男队发展进程中，一次至关重要的机遇分配，承载着队伍梯队建设的关键期待。樊振东的暂时缺位，也意味着国乒男队正式步入新老交替的关键阶段，队伍无法再依赖过往的核心阵容，必须打破固有的格局，直面新生代接班的现实课题。世乒赛作为乒坛顶级赛事，其参赛名额是实力的直接认证，更是检验选手抗压能力、竞技水准的核心舞台，唯有经得起大赛考验的选手，才能扛起国乒延续辉煌的重任。温瑞博作为国乒后备力量，此前一直缺少顶级大赛的历练，此次迎来难得的参赛契机，没有任何退路可言。