速度与激情8

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.”。

B |     (ECNS) -- China’s annual hydrogen production capacity exceeded 51 million metric tons by the end of 2025, up about 1.4% from a year earlier, while actual output rose 7.3% to more than 39 million metric tons, according to a report released Tuesday by the National Energy Administration.    Annual production capacity for renewable hydrogen already in operation surpassed 250,000 metric tons, more than double the level recorded in 2024. The report said hydrogen applications were continuing to expand across the industrial, transport and energy sectors.    China had about 32,000 fuel-cell vehicles on the road by the end of 2025, with larger-scale deployment being explored along freight corridors and at ports.     Globally, 66 countries and regions had released hydrogen development strategies by the end of 2025, together accounting for more than 90% of global GDP.        (By Helen Mo, intern Yang Hongran)                    。

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