每个人都打着哈欠。许多其他脊椎动物也是如此，包括蛇，狗，猫，鲨鱼和黑猩猩。虽然打哈欠是具有感染力的，但不是每个人都打哈欠。大约60-70％的人打哈欠，如果他们看到另一个人在现实生活中或在照片中打哈欠，甚至阅读打哈欠。传染性的打哈欠也发生在动物身上，但它不一定与人类一样。科学家提出了许多关于我们捕捉哈欠的理论。可能最流行的传染性打哈欠理论是，打哈欠是非语言交流的一种形式。打哈欠表明你已经适应了一个人的情绪。科学证据来自于康涅狄格大学2010年的一项研究，该研究得出的结论是，在孩子大约四岁时，当移情技能发展时，打哈欠不会变得具有传染性。在这项研究中，患有自闭症的儿童可能会减少同情心的发展，但与同龄人相比，打哈欠的次数较少。 2015年的一项研究涉及成年人的传染性打哈欠。在这项研究中，大学生接受了性格测试，并被要求观看面部的视频剪辑，其中包括打哈欠。结果表明，同情心较低的学生不太可能抓住哈欠。其他研究已经确定了减少的传染性打哈欠和精神分裂症之间的相关性，这是与减少同理心相关的另一个条件。传染性打哈欠与年龄的关系.然而，打哈欠和同理心之间的联系尚无定论。在PLOS ONE期刊上发表的杜克人类基因组变异中心的研究试图找出导致传染性打哈欠的因素。在这项研究中，328名健康志愿者接受了一项调查，其中包括嗜睡，能量水平和同理心的测量。调查参与者观看了一段人们打呵欠的视频，并计算了他们在观看时打了多少次。虽然大多数人打呵欠，但不是每个人都这样做。在328名参与者中，222人至少打了一次哈欠。多次重复视频测试表明，给定的人是否具有传染性打哈欠是一种稳定的特征。杜克大学的研究发现，移情，时间，智力和传染性打哈欠之间没有相关性，但年龄与打哈欠之间存在统计相关性。年龄较大的参与者不太可能打哈欠。然而，由于与年龄相关的打哈欠仅占反应的8％，研究人员打算寻找传染性打哈欠的遗传基础。
Every person yawns. So do many other vertebrate animals, including snakes, dogs, cats, sharks, and chimpanzees. While yawning is contagious, not everyone catches a yawn. Around 60-70% of people yawn if they see another person yawn in real life or in a photo or even read about yawning. Contagious yawning also occurs in animals, but it doesn’t necessarily work the same way as in people. Scientists have proposed many theories for why we catch yawns. Probably the most popular theory of contagious yawning is that yawning serves as a form of nonverbal communication. Catching a yawn shows you’re attuned to a person’s emotions. Scientific evidence comes from a 2010 study at the University of Connecticut, which concluded yawning does not become contagious until a child is about four years old, when empathy skills develop. In the study, children with autism, who may have impaired empathy development, caught yawns less often than their peers. A 2015 study addressed contagious yawning in adults. In this study, college students were given personality tests and asked to view video clips of faces, which included yawning. The results indicated students with lower empathy were less likely to catch yawns. Other studies have identified a correlation between diminished contagious yawning and schizophrenia, another condition linked to reduced empathy. Relationship Between Contagious Yawning and Age. However, the link between yawning and empathy is inconclusive. Research at the Duke Center for Human Genome Variation, published in the journal PLOS ONE, sought to define the factors that contribute to contagious yawning. In the study, 328 healthy volunteers were given a survey that included measures of sleepiness, energy levels, and empathy. Survey participants watched a video of people yawning and counted how many times they yawned while watching it. While most people yawned, not everyone did. Of the 328 participants, 222 yawned at least once. Repeating the video test multiple times revealed that whether or not a given person yawns contagiously is a stable trait. The Duke study found no correlation between empathy, time of day, or intelligence and contagious yawning, yet there was a statistical correlation between age and yawning. Older participants were less likely to yawn. However, because age-related yawning only accounted for 8% of the responses, the investigators intend to look for a genetic basis for contagious yawning.