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Emotional contagion is a form of social contagion involving the spontaneous spread of emotions and related behaviors. Such emotional convergence can happen from one person to another, or in a larger group. Emotions can be shared across individuals in many different ways both implicitly or explicitly. For instance, conscious reasoning, analysis and imagination have all been found to contribute to the phenomenon. The behaviour has been found in humans, other primates, dogs, and chickens. 

Emotional contagion is important to personal relationships because it fosters emotional synchrony between individuals. A broader definition of the phenomenon suggested by Schoenewolf is "a process in which a person or group influences the emotions or behavior of another person or group through the conscious or unconscious induction of emotion states and behavioral attitudes". One view developed by Elaine Hatfield, et al., is that this can be done through automatic mimicry and synchronization of one's expressions, vocalizations, postures and movements with those of another person. When people unconsciously mirror their companions' expressions of emotion, they come to feel reflections of those companions' emotions.

Etymology