“…Second, concerning emotion nonverbal behavior, we adopted a micro-analysis of behavioral units in multiple expressive systems (i.e., face, gaze, posture, and voice; Ciceri and Balzarotti 2008). Considering the multiplicity of emotional signals that characterize human spontaneous interactions, we expected that a wide range of nonverbal signals used to express blended emotional responses-e.g., frustration, boredom, amusement, etc.would be extremely relevant, whereas stereotyped patterns and prototypical full-face expression of few basic emotions would appear less often within our dataset (Kaiser and Wehrle 2001).…”