there's emotional contagion that takes place in human populations.
在人类群体中,就有着情感的传染。
this is called emotional contagion -- the psychological phenomenon where people 「catch」 feelings from one another like they would a cold.
这也被称为情感感染,这是一种心理现象,人们会像得感冒一样被他人的情绪感染。
zhang, q. y. (2014). the mechanism of emotional contagion and its modulation model: a teaching-activities-oriented research (unpublished doctorial dissertation). shanghai normal university.
emotional contagion describes the fact that we 「catch」 good moods and bad moods from each other (unfortunately, bad moods are more contagious than good moods).