People have a tendency to express and feel emotions that are similar to and influenced by the emotions of others—to automatically mimic and synchronize facial expressions, vocalizations, postures, and movements with those of another and, consequently, to converge emotionally. This phenomenon, known as emotional contagion, can be observed among mobs, in the workplace, in the classroom, and even at home. What physiological and psychological mechanisms may contribute to making moods contagious? Discuss
Source: The Free Dictionary