- Scientists have long debated the reason we yawn, but a recent study shows that bigger yawns are associated with bigger brains!
- In the study, scientists watched 29 YouTube videos of various mammals yawning (such as mice, humans, foxes, elephants and hedgehogs) and discovered that small-brained animals with fewer neurons in the cortex (outer layer of the brain) had shorter yawns than large-brained animals with more of these neurons.
- Furthermore, it was found that primates had longer yawns than non- primates.
- Humans had the longest average yawn at 6 seconds, which was similar to the yawns of African Elephants, which have a brain with a similar weight and number of cortical neurons.
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