How it works
Researchers have studied links with attention, empathy, group behavior, and temperature regulation, but no single explanation accounts for every result.
What people often miss
Contagious yawning is different from spontaneous yawning caused by tiredness or changes in alertness. Susceptibility varies among people and species.
Why this question comes up
The effect can occur from a picture or written word, showing how expectation influences bodily responses.
Key points
- Seeing, hearing, reading about, or even thinking about yawning can trigger a yawn in some people through social and brain responses that are not fully understood.
- Researchers have studied links with attention, empathy, group behavior, and temperature regulation, but no single explanation accounts for every result.
- Contagious yawning is different from spontaneous yawning caused by tiredness or changes in alertness. Susceptibility varies among people and species.
Bottom line
Seeing, hearing, reading about, or even thinking about yawning can trigger a yawn in some people through social and brain responses that are not fully understood.
Source and verification
This Answer was checked against National Institutes of Health. Follow the source for the full official explanation and any later updates.