According to a study published by a team led by a psychologist Andrew Gallup from New York State University in a scientific journal "Biology Letters", the length of mammals and the size of the brain are correlated.The larger the brain size, the longer the yawns, and the shorter the smaller the size.
According to Gallop's research, yawning has a function to cool the brain that has become too hot.The chin stretches and the blood flow to the brain increases, and the deep breathing is replaced by the warm blood in the brain and the newly sent cold blood from the heart, causing heat exchange with the outside air.So the larger the size of the brain, the higher the blood flow, so the yawns will naturally become longer, and if the brain with a higher density neuron will make a longer yawning.
Gallap found the yawning scene from a YouTube video to test this idea.Targets include human, African elephants, walrus, rats, rabbits, lions, horses, horses, gorillas, dogs, cats, 109 individuals.As a result, the average duration of yawning is 0 rats..8 seconds, human beings 6.5 seconds, camel is unexpectedly long 4.In 8 seconds, the dog tested several as a result 2.4 seconds.Cats that tend to be compared with dogs 1.It was 97 seconds.
Galop seems to think that long and powerful yawning has a physiological effect, and that every time he yawns, he promotes brain growth and has brain activity.If this is true, even if yawning comes out during the meeting, it may be possible to say "brain activity!"...。
If you hear that the size of the brain is large and complicated, the longer the yawning yawning, the length of the yawnings of the people around you will start to worry about it.Personally, what about a pattern where short yawning comes out many times?I am worried.
Image by Lapina / ShutterStockSource: Scientific American
(Junjun)