Amygdala
The amygdala is the part of the brain mechanism that underlies empathy and allows for emotional attunement and creates the pathway for emotional contagions. The basal areas including the brain stem form a tight loop of biological connectedness, re-creating in one person the physiological state of the other. Howard Friedman, a psychologist at the University of California at Irvine thinks this is why some people can move and inspire others. The use of facial expressions, voices, gestures and body movements transmit emotions to an audience from a speaker.
Read more about this topic: Emotional Contagion