Effect of repetitive motion intervention on self-avatar on the sense of self-individuality

In recent years, the human Digital Twin has been discussed as new technology. When we discuss a world in which one’s self-avatar autonomously performs social activities in cyberspace, the questions arise whether or not the behavior of the avatars feels like one’s own, and whether or not we can approve of the self-avatars’ social activities on behalf of ourselves. We define such feeling as the sense of self-individuality. In this study, we focused on the situation in which self-avatars perform presentations on behalf of ourselves to investigate the effect of the modification experience on the presentation motions by self-avatars on the sense of self-individuality. We conducted VR-based experiments in which the motion modification intervention was performed on self-avatars over eight weeks by 24 experiment participants. As a result, we found that the sense of self-individuality was improved as the number of modifications and interventions increased. However, we found that the intensity of motion modification did not correlate with the improvement of the sense of self-individuality in this experiment condition. We also found that the sense of self-individuality was reduced when others intervened in the motion. From these results, we clarified that the experience of motion modification on self-avatars is significant when designing the behavior of avatars acting on behalf of ourselves in human Digital Twin. Further investigation is required to clarify the effect of the long-term intervention on behavior to distinguish between the mere exposure effect.