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一般认为，人们应该多晒太阳。但一项最新的研究表明，阳光可能会降低脑力，从而使人更难做出正确的判断。
Those who want to set up the office in the garden as temperatures soar should think twice or put a hat on. A new study shows that sunshine could reduce brain power， making it harder to make the right judgments.
Working in hot temperatures is already known to cause sunstroke， a rise in body temperature， which can cause physical exhaustion. But now scientists say exposure of the head to the sun for long also affects the brain’s ability to function properly.
A study by university teams in Denmark and Greece said workers could be damaging their brains by working in hot， sunny conditions. Eight healthy， active males aged between 27 and 41 took part in the research.
The brain function test consisted of four different computer based maths and logic tasks that relied on precise calculations. Four heat lamps were positioned to radiate（輻射） either on the lower body or the back， side and top of their heads.
Professor Lars Nybo， of the department of nutrition， exercise and sports at the University of Copenhagen said that this study provides evidence that direct exposure to sunlight especially to the head impairs motor and cognitive（认知的） performance. The decline in motor and cognitive performance was observed at 38.5 ℃. Researchers said those exposed to sunlight for long periods should cover their heads.
Professor Andtreas Flouis， of the FAME Laboratory in Greece， said that it is of great importance that people working or undertaking daily activities outside should protect their head against sunlight.
Dips in mental performance caused by sunshine could also mean drivers are more likely to make mistakes on the road， he suggested. The findings appear in the journal Scientific Reports.
How does direct exposure to sunlight especially to the head harm a person’s brain power？
Those who want to set up the office in the garden as temperatures soar should think twice or put a hat on. A new study shows that sunshine could reduce brain power， making it harder to make the right judgments.
Working in hot temperatures is already known to cause sunstroke， a rise in body temperature， which can cause physical exhaustion. But now scientists say exposure of the head to the sun for long also affects the brain’s ability to function properly.
A study by university teams in Denmark and Greece said workers could be damaging their brains by working in hot， sunny conditions. Eight healthy， active males aged between 27 and 41 took part in the research.
The brain function test consisted of four different computer based maths and logic tasks that relied on precise calculations. Four heat lamps were positioned to radiate（輻射） either on the lower body or the back， side and top of their heads.
Professor Lars Nybo， of the department of nutrition， exercise and sports at the University of Copenhagen said that this study provides evidence that direct exposure to sunlight especially to the head impairs motor and cognitive（认知的） performance. The decline in motor and cognitive performance was observed at 38.5 ℃. Researchers said those exposed to sunlight for long periods should cover their heads.
Professor Andtreas Flouis， of the FAME Laboratory in Greece， said that it is of great importance that people working or undertaking daily activities outside should protect their head against sunlight.
Dips in mental performance caused by sunshine could also mean drivers are more likely to make mistakes on the road， he suggested. The findings appear in the journal Scientific Reports.
How does direct exposure to sunlight especially to the head harm a person’s brain power？