Are Emotions Contagious?
Mirror neurons fire in the brain when an act is both performed and observed. In a study where participants were shown faces for a mere 30 milliseconds, their faces activated the muscles to mimic that facial expressions even before they could recognize the expression.
Key Facts In This Video
Humans mimic each other's facial expressions, postures, and elements of speech without realizing it. (0:18)
Human brains have "mirror neurons", neurons that fire when an action is performed and when it is observed. (0:46)
Some neuroscientists believe mirror neuron theory has been over-generalized. (2:34)