Robots at arm’s length: unveiling the dynamics of interpersonal distance preferences in human-robot interactions

Abstract

In social interactions, interpersonal distance is a vital factor influencing relationships, providing protection, and regulating arousal. Despite the intuitive nature of adopting specific distances, little is known about comfortable interpersonal distances with social robots. In our online study with 66 participants using a Go/No-Go task, we investigated perceptions of individuals standing face-to-face with a robot at different distances. In line with the negativity bias hypothesis, participants exhibited a preference for greater distances, as reflected in longer reaction times. Furthermore, the human-likeness of the robots moderated the link between distance and arousal. Finally, the most human-like robot was less liked and evoked higher arousal. These findings have implications for designing social robots and optimizing interactions, particularly in educational or medical contexts.