Behavioral contagion
（重定向自Behavior contagion）
Behavioral contagion is a type of social influence. It refers to the propensity for certain behavior exhibited by one person to be copied by others who are either in the vicinity of the original actor, or who have been exposed to media coverage describing the behavior of the original actor. It was originally used by Gustave Le Bon (1895) to explain undesirable aspects of behavior of people in crowds.