Abstract

Trust is fundamental for successful human interactions. As robots become increasingly active in human society, it is essential to determine what characteristics of robots influence trust in human–robot interaction, in order to design robots with which people feel comfortable interacting. Many interactions are vocal by nature, yet the vocal correlates of trust behaviours have received relatively little attention to date. Here we examine the existing evidence about dimensions of vocal variation that influence trust: voice naturalness, gender, accent, prosody and interaction context. Furthermore, we argue that robot voices should be designed with specific robot appearance, function and task performance in mind, to avoid inducing unrealistic expectations of robot performance in human users.

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