Did you yawn after reading that title, or when you just think about the act of yawning? Scientists propose that yawning increases arousal and alertness whilst also helping to cool the brain and to relieve ear pressure. Listen until the end as we discuss why yawning is contagious and why some people (read: not Zhao Yong) are usually immune to it.
TLDR: Drowsiness and boredom are the most common stimulus for yawning where scientists propose that yawning increases arousal and alertness
Links:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3678674/
https://link.springer.com/article/10.3758/BF03334587
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Credit for theme music: Fresh Time by Roa https://soundcloud.com/roa_music1031
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