“…A wealth of research confirms that the dynamics of head orientation and gaze contain critical information that determines in many ways a perceiver's behavior and the course a communication takes. Social gaze is a disambiguating cue in referential communication ( Hanna & Brennan, 2007 ); informs social bonding, trust building, and rapport ( Wolf, Launay, & Dunbar, 2016 ); moderates the perception of facial expressions of emotion ( Adams Jr & Kleck, 2005 ); provides signals to negotiate turn taking ( Duncan, 1972 ); affects the efficiency of both verbal and nonverbal communication between social partners in many other ways (e.g., Goldman, 1980 ); and elicits direct and immediate, inescapable affective responses ( Hietanen, 2018 ). Kleinke (1986) , in a very comprehensive review, provides many more examples that illustrate the richness of mutual gaze behavior and the various functions it serves in communication and social interaction.…”