A Study on Social Inclusion of Humanoid Robots: A Novel Embodied Adaptation of the Cyberball Paradigm

As social robots are being built with the aim of employing them in our social environments, it is crucial to understand whether we are inclined to include them in our social ingroups. Social inclusion might depend on various factors. To understand if people have the tendency to treat robots as their in-group members, we adapted a classical social psychology paradigm, namely the "Cyberball game", to a 3-D experimental protocol involving an embodied humanoid robot. In our experiment, participants played the ball-tossing game with the iCub robot and another human confederate. In our version, the human confederate was instructed to exclude the robot from the game. This was done to investigate whether participants would re-include the robot in the game. In addition, we examined if acquired technical knowledge about robots would affect social inclusion. To this aim, participants performed the Cyberball twice, namely before and after a familiarization phase when they were provided with technical knowledge about the mechanics and software related to the functionality of the robot. Results showed that participants socially re-included the robot during the task, equally before and after the familiarization session. The familiarization phase did not affect the frequency of social inclusion, suggesting that humans tend to socially include robots, independent of the knowledge they have about their inner functioning.