The exact causes of contagious yawning are still debated, but two leading hypotheses are the nonconscious mimicry hypothesis ...
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Does yawning mean our brains aren’t getting enough oxygen?One theory is that by moving the muscles in the face and neck, yawning stimulates the carotid arteries in the neck, increasing blood flow to the brain and waking it up. Additionally, a 2012 study ...
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