Why Do We Yawn? Защо се прозяваме?

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Използвайте следните думи: important, snakes, actually, research, yawn, stranger, cold, to, literally, overall, click, similar, overheating, perform, socially, likely, Babies, video, computer, with, temperature, development, develop, humans, less.

Almost all animals with a spine ______. Penguins do it as a mating ritual, ______ do it to realign their jaws after a meal and guinea pigs do it to display anger. So, why exactly do ______  yawn? And is yawning ______  contagious?
If you haven't already checked out our YAWN-O-METER video, ______ here, or use the link in the description, to see how long you can last before yawning. If you're anything like us, you may have even yawned at the title of this ______.
The truth is, the first time you yawned was likely as a fetus. ______ begin to yawn during the second trimester, and though the reason why is still unknown, it may have to do ______  proper brain ______. In adults, yawns were commonly thought to draw more oxygen into the lungs making you feel less tired, but new ______ states that this may not be the case.
Scientists now believe that yawning has developed as a way of physiologically cooling your brain.
Much like a ______, your brain works best at a certain temperature, and tries to avoid "______". And it turns out yawning increases your heart rate, blood flow and the use of muscles in your face which are all essential to cooling the brain. On top of that, deeply inhaling cold air can alter the ______ of the blood in our head.
But why is your brain hot in the first place?
Well, both exhaustion and sleep deprivation are known to increase ______ brain temperature, which explains why yawning occurs more in these states. Researchers have even found participants who place warm packs on their head yawn 41% of the time while watching others yawn, as opposed to 9% of the time with a ______ pack on their head. So if your head is already cold, you'll yawn ______.
But what about contagious or social yawning?
Humans, primates and even dogs find yawning contagious, and it's most ______ linked to empathy. Contagious yawning begins in children around the age of 4-5, and this is when empathetic behaviour, along with the ability to identify emotions, begins to ______. In fact, children with empathy-related disorders, such as autism, yawn less in response to videos of people yawning compared ______ other children. Research also suggests that you are more likely to copy the yawn of someone ______ or genetically close to you. Even dogs are more likely to copy the yawns of their owner as opposed to the yawn of a ______.
Finally, mirror neurons also play a role. In our brain, mirror neurons fire when we ______ a specific action, view someone else doing the action or even just hear someone talk about the action. They are ______ brain cells that are used for learning, self-awareness and relating to others. When we view someone else yawn, the mirror neurons in our brain become activated in a ______ way, and as a result we copy the yawn.
So although yawning may occur in people who are ______ "hot headed", contagious yawning allows us to be cool with the people around us.
If you haven't already checked out our Yawn-O-Meter, go try it out and let us know in the comments how long you were able to last. And subscribe for more weekly science videos!

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