1. Watanabe, T., Okubo, M., Nakashige, M., Danbara, R.: Interactor: speech-driven embodied interactive actor. Int. J. Hum. Comput. Interact. 17, 43–60 (2004)
2. Condon, W.S., Sander, L.W.: Neonate movement is synchronized with adult speech. Science 183, 99–101 (1974)
3. Nagai, H., Watanabe, T., Yamamoto, M.: InterPointer: speech-driven embodied entrainment pointer system. In: Proceedings of the 2005 International Conference on Active Media Technology, pp. 213–218 (2005)
4. Takahashi, K., Takemura, K.: Multi eye-gaze tracking system using head pose direction. IEICE Tech. Rep. 113(196), 63–69 (2013). (in Japanese)
5. Taniguchi, K., Hamakawa, R.: Presentation support system to visualize reactions of the audience. In: IPSJ Interaction 2018, 1B53, pp. 389–394 (2018)