Research call this phenomena "emotional contagion". This is a natural process that pre-wired our brain via "mirror-neurons" that allow us to sense and reflect other people's emotions. (Blume. 2007). As stated in the Chameleon Effect, we have a natural tendency to imitate another person's speech inflections and physical expressions (Bargh and Chartand, 1999).
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Psychopath: Book one
Science FictionThis is book one in my 101 series, full of psychological facts. read to find out more.