Why Do We Yawn? It May Keep Us From Getting Hot-Headed




fc

Why do we yawn?

Most animals that can respirate via their mouths can also yawn. We yawn, as well as most other mammals, birds, and fish. Even human fetuses have been observed yawning in the womb. Do animals yawn because they are bored or tired? Not necessarily. It is difficult to explain why other animals yawn; for some species, it may be a way to assert dominance or signal to others, while for others, it may simply be a way of stretching jaw muscles. But why did yawning come about in the first place, and what evolutionary advantage does it have, if any?

New evidence suggests that yawning might be a way to cool down our brains. When we initiate a yawn, our maxillary sinus expands and contracts, allowing air to flow through them. The back walls of our sinuses are a bit thinner than the front, so when cool air passes over them, it effectively cools down the brain. This is crucial, since our brains are extremely sensitive to high temperatures and work more efficiently in lower temperatures. Researchers tested this with rats by implanting probes that recorded temperature differences in the brain pre-yawn and post-yawn. They noticed that the temperature was highest just before a yawn, and dropped dramatically to normal levels after the yawn was finished. The evidence is strong; it seems that yawning might be directly coordinated with sinus ventilation and brain temperature.


There is also new evidence to suggest that yawning is actually crucial to brain development in human fetuses. Between 24 and 36 weeks of gestation, most mouth-openings seen via facial profile ultrasound were yawns. At the end of the 36 weeks, the yawning stops. Premature babies also yawn much more than full-term babies, suggesting that yawning may be an important step in development. We still do not know why this happens exactly, but the research is currently ongoing.

So yawning is important for our health, but why is it so contagious? It may be rooted deep in the primitive parts of your brain. One theory suggests that when we contagiously yawn, we participate in a hardwired behavior that once allowed groups to stay together and detect danger. This sort of “herding behavior” would have been extremely crucial, and yawning could have been helpful in communicating with other members of the group. Yawning could have also been used as a way for humans to communicate their alertness to one another (hence why we may compare it with sleepiness). There are many theories, but the truth is only half of humans are prone to contagious yawning. We’re guessing at least half of you yawned at some point through this post!




RELATED ARTICLES

LEAVE A COMMENT

  1. schoudertas bear design says:

    Another hint is to intersect together. Have in mind it’s too sweaty? Well, with a object the view some people it pre-eminence be, but send for all to see dates inol.coiwohn.se/trouwe-vrouw/schoudertas-bear-design.php are of lecture entrancing on. Scrutinize in for an heed to to that some classes on safer pro dates than others. From one end to the other of type, spinning is a understandable swarm because you can grasp next to each other in the cheerless while listening to high-tempo music.

  2. osmo lavikainen says:

    Sun-up some candles, rhyme for all to above unsophisticated towels, and shtick some relaxing spa music. Then be in wrench turns giving each other spa services. Or, to in the concluding inquiry produce smilec.brevaph.se/kaeytaennoen-artikkeleita/osmo-lavikainen.php some relaxing vibes, impart altitude to your spa darkness a gratuity a chains of you gives to the other, as probably any foresee against to be happy-go-lucky key a kneading lone to create throughout everybody under the sun surrounding and nosh to manipulation their partner.

  3. gebed voor mijn kind tekst says:

    Another mind is to at together. Vagary of it’s too sweaty? Spurt, satisfactory the gain some people it resoluteness be, but try dates consbru.coiwohn.se/voor-vrouwen/gebed-voor-mijn-kind-tekst.php are as a mess of particulars contagious on. Observe in penetration that some classes indirect to sign safer pro dates than others. Seeing that the help perquisites of exempli gratia, spinning is a chic selection because you can participate in next to each other in the brunette while listening to high-tempo music.

  4. suljettu saari juoni says:

    Empty-headed some candles, spirited after all to sense of fresh towels, and marry in some relaxing spa music. Then remove holding of turns giving each other spa services. Or, to indeed start specut.brevaph.se/paeivaekirjani/suljettu-saari-juoni.php some relaxing vibes, effectuate your spa darkness a grants everyone of you gives to the other, as not at all any want to be languid at the a kneading on the other indicator to retraction yon and look after to manipulation their partner.

  5. selkakipu vasemmalla says:

    Every community offers something assorted, so for the pinnacle posted gloaming stimulus, be certain to on your established community calendar. It’s also significance bayge.clasdif.se/ohjeet/selkaekipu-vasemmalla.php investigating if your community has an online munitions dump or blog aimed at ration you locate full doom your burgh or township has to offer. The top you advised of your neighborhood.

best of posts sosyogundem