Abstract

The purpose of this paper is to examine the replicability, generalizability, and efficacy of the optimal rate of mimicry in human-robot interactions reported by Y. Shinohara et al. (HAI'16, 2016). That study showed that a mimicry rate of about 83% was optimal to increase the likability of an upper-body humanoid Nao robot. To replicate the findings regarding the optimal rate of mimicry, and to examine these generalizability of the results, in study 1 we conducted experiments using the same method with two kinds of humanoid robots: a whole-body humanoid Nao robot and a whole-body humanoid Nao robot with randomly changing eye color between white to red. In study 2, we investigated whether increased likability triggered by mimicry also enhances helping behaviors from a human participant. Our study results confirmed the earlier findings from Shinohara et al. reinforcing the finding about the optimal rate of mimicry in human-robot interaction. Furthermore, we could demonstrated that mimicry can lead to helping behavior from the human participant which could have important implications for establishing cooperative interactions between humans and robots.

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