Abstract. In this paper, we propose to enact interaction by "extreme" motion involving multiple body parts and thereby maximize the whole body experience. By detecting the relative movements among multiple body parts, rather than an extended motion of just a single body part, the extreme motion can be contained within the personal space (not to disturb others around). Such a scheme was tested on a simple mobile game and compared to interfaces that were based on conventional touch interface and absolute motion detection. Experimental results showed that while incorporating extreme "relative" motion resulted in higher level of excitement and user experience by involving more body parts, the control performance significantly suffered (due to the head movements).

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