Preliminary Exploration of Agent-Human Emotional Contagion via Static Expressions

In social psychology, emotional contagion describes the widely observed phenomenon of one person’s emotions mimicking surrounding people’s emotions [13]. While it has been observed in humanhuman interactions, no known studies have examined its existence in agent-human interactions. As virtual characters make their way into high-risk, high-impact applications such as psychotherapy and military training with increasing frequency, the emotional impact of the agents’ expressions must be accurately understood to avoid undesirable repercussions. In this paper, we perform a battery of experiments to explore the existence of agent-human emotional contagion. The first study is a between-subjects design, wherein subjects were shown an image of a character’s face with either a neutral or happy expression. Findings indicate that even a still image induces a very strong increase in self-reported happiness between Neutral and Happy conditions with all characters tested and, to our knowledge, is the first ever study explicitly showing emotional contagion from a virtual agent to a human. We also examine the effects of participant gender, participant ethnicity, character attractiveness, and perceived character happiness and find that only perceived character happiness has a substantial impact on emotional contagion. In a second study, we examine the effect of a virtual character’s presence in a strategic situation by presenting subjects with a modernized Stag Hunt game. Our experiments show that the contagion effect is substantially dampened and does not cause a consistent impact on behavior. A third study explores the impact of the strategic decision within the Stag Hunt and conducts the same experiment using a description of the same strategic situation with the decision already made. We find that the emotional impact returns again, particularly for women, implying that the contagion effect is substantially lessened in the presence of a strategic decision.

[1]  U. Dimberg,et al.  Gender differences in facial reactions to facial expressions , 1990, Biological Psychology.

[2]  Jonathan Gratch,et al.  The effect of expression of anger and happiness in computer agents on negotiations with humans , 2011, AAMAS.

[3]  Albert A. Rizzo,et al.  Development of a VR therapy application for Iraq war military personnel with PTSD. , 2005, Studies in health technology and informatics.

[4]  Lars-Olov Lundqvist,et al.  Factor structure of the Greek version of the Emotional Contagion Scale and its measurement invariance across gender and cultural groups , 2008 .

[5]  Giuseppe Riva,et al.  Virtual Reality in Psychotherapy: Review , 2005, Cyberpsychology Behav. Soc. Netw..

[6]  Tibor Bosse,et al.  A Multi-agent Model for Emotion Contagion Spirals Integrated within a Supporting Ambient Agent Model , 2009, PRIMA.

[7]  Owe Svensson,et al.  Gender differences in facial imitation and verbally reported emotional contagion from spontaneous to emotionally regulated processing levels. , 2008, Scandinavian journal of psychology.

[8]  Deborah A. Small,et al.  The Face of Need: Facial Emotion Expression on Charity Advertisements , 2009 .

[9]  S. Bem.  The measurement of psychological androgyny. , 1974, Journal of consulting and clinical psychology.

[10]  J. Cacioppo,et al.  Emotional Contagion , 1993 .

[11]  Ning Wang,et al.  Rapport and facial expression , 2009, 2009 3rd International Conference on Affective Computing and Intelligent Interaction and Workshops.

[12]  M. Schweitzer,et al.  Feeling and believing: the influence of emotion on trust. , 2003, Journal of personality and social psychology.

[13]  Sigal G. Barsade.  The Ripple Effect: Emotional Contagion and its Influence on Group Behavior , 2002 .

[14]  U. Hess,et al.  Facial mimicry and emotional contagion to dynamic emotional facial expressions and their influence on decoding accuracy. , 2001, International journal of psychophysiology : official journal of the International Organization of Psychophysiology.

[15]  Nicole C. Krämer,et al.  It's in Their Eyes: A Study on Female and Male Virtual Humans' Gaze , 2011, IVA.

[16]  Funda Durupinar.  From audiences to mobs: Crowd simulation with psychological factors (Kitlelerden güruhlara: Psikolojik faktörlerle kalabalık simülasyonu) , 2010 .

[17]  Timothy D. Wilson,et al.  A model of dual attitudes. , 2000, Psychological review.

[18]  Ana Paiva,et al.  A Generic Emotional Contagion Computational Model , 2011, ACII.

[19]  Stacy Marsella,et al.  Virtual Rapport , 2006, IVA.

[20]  David A. Lishner,et al.  Rapid Emotional Contagion and Expressive Congruence Under Strong Test Conditions , 2008 .

[21]  Stefan Kopp,et al.  Media Equation Revisited: Do Users Show Polite Reactions towards an Embodied Agent? , 2009, IVA.

[22]  E. Hatfield,et al.  Emotional Contagion , 1995 .

[23]  N. Stockert,et al.  Perceived similarity and emotional contagion , 1994 .

[24]  M. Erb,et al.  Are emotions contagious? Evoked emotions while viewing emotionally expressive faces: quality, quantity, time course and gender differences , 2001, Psychiatry Research.

[25]  A. Kring,et al.  Sex differences in emotion: expression, experience, and physiology. , 1998, Journal of personality and social psychology.

[26]  Pierre Philippot,et al.  Facial Reactions to Emotional Facial Expressions: Affect or Cognition? , 1998 .

[27]  Alicia A. Grandey,et al.  Emotion regulation in the workplace: a new way to conceptualize emotional labor. , 2000, Journal of occupational health psychology.

[28]  Milind Tambe,et al.  Empirical Evaluation of Computational Emotional Contagion Models , 2011, IVA.

[29]  J. Cohn,et al.  All Smiles are Not Created Equal: Morphology and Timing of Smiles Perceived as Amused, Polite, and Embarrassed/Nervous , 2009, Journal of nonverbal behavior.

[30]  R. Doherty.  The Emotional Contagion Scale: A Measure of Individual Differences , 1997 .

[31]  S. Pugh,et al.  Service with a Smile: Emotional Contagion in the Service Encounter , 2001 .