This is what researchers call when we mimic the expressions and the emotions of the people around us.
The phrase "misery loves company" is a widely-used term and it seems that there is truth behind the phrase. Emotional contagion happens because of the mirror neuron system. Our neurons fire up when we behave in certain ways and is a probable explanation for how we experience empathy towards others.
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Emotional contagion is a phenomenon that occurs when a person or groups emotions and behaviours affect the emotions and behaviours of some other person or group. This can be negative or positive.
We often mimic or imitate the emotional expressions (smiles and frowns) of other people without even realizing it. Mimicry and copying the body language, voice or facial expressions of other people is natural among social creatures, due to 'mirror neurons’ in the cerebral cortex region of the brain.
It is generally considered a positive emotion and is a vital social, emotional and cognitive function. It is a communal activity that encourages bonding, reduces any possible conflict, and eases stress and anxiety. Laughter can be classified in different types: