It's easy to be offended when a colleague yawns while you're talking. But that yawn may not mean what you think.
人们很容易会被这样一种行为惹恼:当你说话的时候,你的同事却在打着哈欠。但对于这个哈欠,也可能是你想得太多了。
A growing number of researchers believe the purpose of this little-understood behavior is to cool the brain, says a research review published earlier this year in Frontiers in Neuroscience.
今年早些时候发表在《神经科学前沿》(Frontiers in Neuroscience)上的一项研究综述称,越来越多的研究人员认为,打哈欠这种人们对其还知之甚少的行为,其目的在于为大脑降温。
Changes in climate affect how often people yawn. Researchers in an earlier study conducted outdoor interviews with two groups of people in Tucson, Ariz., one in early summer and one in the winter. People were asked to look at pictures of people yawning and talk about their own yawning behavior.
气候的变化会影响到人们打哈欠的频率。研究人员在之前的一次研究中对亚利桑那州图森市(Tucson)的两组人进行了户外采访,一次是在初夏,另一次是在冬天。研究人员让被访者看了一些人们打哈欠的照片,并谈了谈他们自己的打哈欠行为。
People were nearly twice as likely to yawn when they were surveyed during the winter, when they could inhale cool air to reduce the temperature of the brain, says the study, published in 2011 in Frontiers in Evolutionary Neuroscience. Participants yawned less when surveyed in the early summer, when temperatures outdoors were about the same as the human body.
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