“…In recent years, researchers have shown that it is possible to automatically detect complex social phenomena, often using predominantly or only nonverbal behavior; from dominance [15,20,21,26,39,43], functional roles [12,28,54], deception [7,40], cohesion [24], attraction [29,30,41,49], interest [16,36,48,52], influence [38,44], rapport [19,46], to friendship [53].…”