“…Furthermore, technologies were developed to prevent hacking and enhance hacking detection in robot communications (Abeykoon & Feng, 2017). Efforts were also made to enhance communication abilities and communication links between robots and the operators when the link becomes low such as inside a building (Nguyen, Farrington, & Pezeshkian, 2004). In addition, abilities to pick up non-verbal cues and respond to natural nonverbal behaviors were researched (Vogeley & Bente, 2010).…”