根据第三段第二句 "The volunteers looked at videos of other people yawning.”以及倒数第二句“The volunteers were videoed as they yawned or tried not to yawn.”两句可知,参与研究的 志愿者们既要看打哈欠的视频,又会被拍 摄自己做出的反应。故D项正确。
Yawning is something that most people do several times every day, without evening thinking about it. It is most commonly done before falling asleep and when you wake up and so is usually considered as a sign of being tired. But why do we really yawn and what does it mean?
Some think we yawn because we feel bored. Others believe yawning has something to do with breathing(呼吸). When there is too much carbon dioxide(二氧化碳) in our bodies, our bodies will tell the brains(大脑) to breathe deeply. That causes a big yawn. In 2007, scientists said people ...
they saw others yawning want to yawn when they see other people yawning. The researchers said people actually yawn more when they try to stop D. they had a strong urge to yawn yawning. The researchers also found that some people have a 9. What did all the volunteers do in the much ...
While all of this is still being researched,scientistshave discovered some reasons why people yawn. They have also done work to figure out if the reflex is contagious, as it is widely believed to be. 1– It Cools Your Brain Thermal images show that yawning might help tocool the human brai...
fearsome canine teeth. Guinea pigs do the same thing. Penguins yawn in their mating rituals. Snakes yawn to realign their jaws after swallowing a large meal. In many animal species, it would seem that there is a straightforward reason for yawning. The same cannot be said for people, though...
Fortunately, some of their issues are partly resolved and by now, for example, most experimental studies do use a non-yawn stimulus as a control condition to compare yawning rates. Additionally, Campbell and de Waal (2010) noticed that there are large between-study differences in the number ...
Why do people get headaches? Why do old dogs sleep so much? Why did humans evolve? Why do people talk in their sleep? Why does crying make you tired? Why do people die? Why do humans need to stretch? Why do you yawn when you wake up?
Why do dogs yawn? Why do dogs flap their ears? Why do dogs sniff everything? Why do dogs pee on themselves? Why do dogs jump up on people? Why do dogs live short lives? Why don't dogs sweat? Why do dogs bite? Why do dogs shake off when wet?
other times you sneeze a few times in a row. Some people sneeze loudly while others sneeze very quietly. It's not clear why sneezes are so different between people, but scientists believe it has to do with the individual and how their body responds to stimuli. For those who are sensitive...