Experimental study of empathy and its behavioral indices in human-robot interaction. - Yuichiro Tsuji; Ami Tsukamoto; Takashi Uchida; Yusuke Hattori; Ryosuke Nishida; Chie Fukada; Motoyuki Ozeki; Takashi Omori; Takayuki Nagai; Natsuki Oka (HAI, 2014)