What about the connection between yawning and tiredness? We certainly yawn more when we’re feeling sleepy or sluggish, but why is this? Theories that it helps give the body extra energy are largely discredited, as we don’t yawn when we exercise, a time when we definitely need more get-up-and-go!
Psychologist Catriona Morrison from the University of Leeds says yawning is an ancient reflex. She told the BBC that it may have started in “the days of cavemen when someone had to be on watch all the time - yawning increases cerebral blood flow so can improve alertness.”
What about our friends' contagious yawning? Some think it comes down to empathy. While all vertebrate mammals yawn, only humans and chimpanzees ‘catch’ yawns from others. Studies have shown we yawn more frequently when in the company of close relatives and friends. Could yawning actually help us cement our closest relationships?
If it does, next time you yawn in company, don’t feel too embarrassed. You’re just showing off your people skills.
词汇表 contagious 会传染的
motor 肌肉运动的,运动神经的
cortex (尤指大脑或其他器官的)皮层
involuntary 不由自主的
physiological 生理的
physician 医生(尤指内科医生)
cauldron (通常指架在火上的)大锅
colourful 有趣的,有声有色的
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最新
2019-11-15
2019-11-15
2019-11-15
2019-11-15
2019-11-15
2019-11-15