Why do we yawn when others yawn?
Show answer & explanation
Answer: Seeing a yawn triggers an automatic imitation response
Seeing a yawn triggers an automatic imitation response ✓ — Correct! This is the leading explanation: seeing a yawn sets off an automatic urge to imitate, though researchers are still debating the exact brain mechanism behind it.
Yawns release a chemical that spreads through the air — Wrong. No chemical or other physical substance is known to travel through the air and make you yawn; the effect comes from seeing or hearing a yawn.
We yawn because we are just as tired as the yawner — Wrong. People catch yawns even when they are wide awake, so tiredness alone does not explain why yawning spreads from person to person.
More Human Biology questions
- In mice, why can calorie restriction slow some signs of aging while a chronic disease like diabetes speeds up others?
- Why do different tissues in the body age at different rates?
- After a long flight, why is a brief daytime nap safer than sleeping for hours?
- Why can late-afternoon coffee at your destination sabotage first-night jet lag?
- Why can jet lag upset your stomach even after a decent sleep on the plane?
- For a 36-hour overseas trip, why might staying on home sleep hours beat forcing local time?