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.”。
二 | 马新陆路关卡的交通预料在来临9月份，预料将非常繁忙，图为新山关卡。（取自BSI面子书）（新加坡讯）这个月国庆日长周末期间，兀兰和大士关卡的通关人次突破54万，再创新高。有鉴于9月学校假期将在这个周末开始，新加坡移民与关卡局表示，这个周五到下周日，两个关卡的交通预料将非常繁忙。《8视界新闻网》报导，移民与关卡局说，由于车龙从大马回堵到新加坡，在国庆日长周末期间开车出行的公众需要花长达3个小时的时间才能通关。当局建议公共可以考虑乘搭跨境巴士出行。移民与关卡局也提醒出行者预留额外的等候时间，并恳请他们同移民与关卡局人员合作，遵守交通规则，不要随意改换车道。
三 | 当局会毫不犹豫地采取行动，对付不配合指示、在关卡违法的出行者。
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