History
In 1993 psychologists Elaine Hatfield, John Cacioppo and Richard Rapson gathered evidence that people automatically mimic others' expressions, tone and posture and end up sharing their feelings, and named it emotional contagion. Newborns crying when they hear other babies cry had been noted long before, and nineteenth-century students of crowd psychology described emotions sweeping through crowds.
Mechanism and research
When someone smiles, the corners of our mouth twitch upward too; the facial-feedback account holds that those muscle movements signal the brain and help generate the feeling itself. In 2008 Fowler and Christakis followed about 5,000 people for 20 years and reported that having a happy friend nearby raised one's own chances of happiness. In 2014 Facebook published an experiment that tweaked the emotional tone of news feeds for roughly 690,000 users; the effect was small, but manipulating moods without consent sparked an ethics outcry.
Everyday effects and coping
One irritable manager can sour a whole team, and call-centre staff who absorb angry customers all day are prone to emotional labor and burnout; caregivers may develop compassion fatigue. Naming which feelings are yours and which are someone else's, stepping back briefly and slowing your breathing all help—skills at the heart of emotional intelligence.
FAQ
- Is emotional contagion the same as empathy?
- Contagion is automatic catching of a feeling; empathy is a more deliberate understanding that keeps your own feelings distinct.
- Can emotions spread through social media?
- Yes—studies such as the 2014 Facebook experiment found small but measurable effects.
Sources reviewed: 2026-10-26
References
- Hatfield, E., Cacioppo, J. T., & Rapson, R. L. (1993). Emotional contagion. Current Directions in Psychological Science, 2(3), 96–100.
- Kramer, A. D. I., Guillory, J. E., & Hancock, J. T. (2014). Experimental evidence of massive-scale emotional contagion through social networks. PNAS, 111(24), 8788–8790.
- Fowler, J. H., & Christakis, N. A. (2008). Dynamic spread of happiness in a large social network. BMJ, 337, a2338.