The bigger the yawn, the bigger the brain, scientists find
 

The bigger the yawn, the bigger the brain, scientists find
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While every STAT story aims to stimulate your cortex, if this one falls short and makes you yawn, you can thank us anyway — at least if a study published Tuesday is right.

If you have a big brain, you can credit yawning for promoting brain growth and activity, the researchers found. And if you have a small brain, you can blame the fact that you don’t yawn long e**ugh.

By “you,” psychologist Andrew Gallup of the State University of New York at Oneonta and his colleagues mean “your species.” In the paper in Biology Letters, they report that the average duration of yawns in 109 individuals from 19 species — from humans, African elephants, and walruses to mice, and rabbits, and capuchin monkeys — predicts a species’ brain weight and its number of cortical neurons. Read more...

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