This study investigates the influence of a robot’s speech rate. In human communication, slow speech is considered boring, speech at normal speed is perceived as credible, and fast speech is perceived as competent. To seek the appropriate speech rate for robots, we test whether these tendencies are replicated in human-robot interaction by conducting an experiment with four rates of speech: fast, normal, moderately slow, and slow. Our experimental results reveal a rather surprising trend. Participants prefer normal and moderately slow speech to fast speech. A robot that provides normal or moderately slow speech is perceived as competent. We further study how context affects this perception. In a situation where the robot and participants talk while walking, we found that slow speech was the most comprehensible. In addition, slow speech is subjectively perceived as good as moderately slow and normal speech. Keywords: Human-robot interaction; speech rate
2024. Examining the Effects of Communication Features of Educational Robots on Students’ Cognitive Load, Attitudes, and Learning Performance. Journal of Educational Computing Research 62:4 ► pp. 984 ff.
2016. An Architecture for Telenoid Robot as Empathic Conversational Android Companion for Elderly People. In Intelligent Autonomous Systems 13 [Advances in Intelligent Systems and Computing, 302], ► pp. 939 ff.
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