M. E. Hoque and R. W. Picard, Rich Nonverbal Sensing Technology for Automated Social Skills Training, Computer, vol.47, issue.4, pp.28-35, 2014.

B. K. Wiederhold and S. Bouchard, Social anxiety disorder: Efficacy and virtual humans, Advances in Virtual Reality and Anxiety Disorders, pp.187-209, 2014.

M. Chollet, T. Wörtwein, L. Morency, A. Shapiro, and S. Scherer, Exploring Feedback Strategies to Improve Public Speaking: An Interactive Virtual Audience Framework, Proceedings of UbiComp, pp.1143-1154, 2015.

S. Poeschl and N. Doering, Designing virtual audiences for fear of public speaking training-an observation study on realistic non-verbal behavior, Annual Review of Cybertherapy and Telemedicine: Advanced Technologies in the Behavioral, Social and Neurosciences, ser. Studies in health technology and informatics, vol.181, pp.218-222, 2011.

D. Pertaub, M. Slater, and C. Barker, An experiment on public speaking anxiety in response to three different types of virtual audience, Presence: Teleoperators and virtual environments, vol.11, issue.1, pp.68-78, 2002.

N. Kang, W. Brinkman, M. B. Van-riemsdijk, and M. Neerincx, The design of virtual audiences: Noticeable and recognizable behavioral styles, Computers in Human Behavior, vol.55, pp.680-694, 2016.

M. Chollet, N. Chandrashekhar, A. Shapiro, L. P. Morency, and S. Scherer, Manipulating the Perception of Virtual Audiences Using Crowdsourced Behaviors, International Conference on Intelligent Virtual Agents, pp.164-174, 2016.

M. Ochs, B. Ravenet, and C. Pelachaud, A crowdsourcing toolbox for a user-perception based design of social virtual actors, Computers are Social Actors Workshop, 2013.

A. Mehrabian, Non-verbal communication, 1977.

M. Argyle and R. Ingham, Gaze, mutual gaze, and proximity, Semiotica, vol.6, issue.1, pp.32-49, 1972.

M. L. Knapp, J. A. Hall, and T. G. Horgan, Non-verbal communication in human interaction. Cengage Learning, 2013.

T. Wörtwein, M. Chollet, B. Schauerte, L. P. Morency, R. Stiefelhagen et al., edu) is a post-doctoral researcher at the USC Institute for Creative Technologies. He received his PhD in 2015 from Telecom Paristech. His current research focuses on multimodal interaction techniques enabling social skills training, such as social signal processing to assess users' interpersonal skills, Proceedings of the 2015 ACM on International Conference on Multimodal Interaction, pp.43-50, 2015.

S. Scherer, ) is a Research Assistant Professor and Associate Director of Neural Information Processing at the University of Southern California. He received the degree of Dr.rer.nat. from Ulm University in Germany. His research aims to automatically identify, model, and synthesize individuals' multimodal nonverbal behavior