在17和18世纪,医生们认为哈欠可以增加血液中的氧气、使血压和心率上升、促进血流。
More recently, consensus moved toward the idea that yawning cools down the brain, so when ambient conditions and temperature of the brain itself increase, yawning episodes increase.
近年来,更多人认为哈欠会让大脑冷静,所以当外界条件趋于紧张,大脑温度增加时,打哈欠的频率也会增加。
Despite all these theories, the truth is that scientists do not know the true biological function of a yawn.
虽说有这么多的理论,但真相是,科学家并不知道哈欠真实的生物功能。
What we do know is that yawning occurs in just about every species. It happens when an animal is tired. It can be used as a threat display in some species.
我们只知道,几乎每种动物都会打哈欠。动物疲劳的时候会打哈欠。一些动物用哈欠作为威胁。
Yawning can occur during times of social conflict and stress, something researchers call a displacement behavior.
哈欠还可以在遇到社会冲突和压力时产生。一些研究人员称之为替代行为。
And that wide-open mouth can be contagious, especially in social species such as humans, chimpanzees, bonobos, macaques and wolves.
而且,打哈欠会传染,特别是在社会型动物中,比如人类、黑猩猩、倭黑猩猩、猕猴和狼。
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