What is Proactive Human-Robot Interaction? - A review of a progressive field and its definitions

During the last 15 years, an increasing amount of works have investigated proactive robotic behavior in relation to Human-Robot Interaction (HRI). The works engage with a variety of research topics and technical challenges. In this paper a review of the related literature identified through a structured block search is performed. Variations in the corpus are investigated, and a definition of Proactive HRI is provided. Furthermore, a taxonomy is proposed based on the corpus and exemplified through specific works. Finally, a selection of noteworthy observations is discussed.