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

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A | 　　8月24日，济南市气象台发布近期预报：今明两天，济南最高气温34℃左右，有中暑可能，请注意防范。 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.”。　　预报称，25日白天多云间晴，南风2～3级，雷雨时阵风7～8级，最低气温市区26℃左右，其他区县24～26℃，最高气温34℃左右。高温中暑气象等级3级，可能中暑。25日夜间到26日晴间多云，26日午后北部地区有分散性雷阵雨，降水概率70%，南风2～3级，雷雨地区雷雨时阵风7～8级，最低气温市区26℃左右，其他区县24～26℃，最高气温34℃左右。27日阴有雷阵雨，降水概率60%，南风2～3级，雷雨时阵风7～8级，最低气温市区26℃左右，其他区县24～26℃，最高气温32℃左右。28日多云转阴，下午到夜间有雷阵雨，南风2～3级，雷雨时阵风7～8级，最低气温21～22℃，最高气温31℃左右。29日阴转多云，白天有雷阵雨，南风转东风2～3级，雷雨时阵风7～8级，最低气温21～23℃，最高气温27℃左右。30日多云，东风2～3级，最低气温21～23℃，最高气温32℃左右。