Abstract: By reviewing Wiener’s original intention to develop cybernetics and the media history of Licklider’s designing of militarized air defense systems, we will discover the hidden ergonomic testing structure of today’s Action Role-playing Games （ARPG） . The prototype of this test structure was the SAGE air defense system and the user graphical interface. During the highly frequent human-machine interaction, each set of negative feedback regulation systems within humans and machines can adapt to each other. This ergonomic testing structure based on the designing concept of turning the user into an extension of the machine, combines the commensurability of computer hardware and the reversibility of the physical body to form a larger feedback loop. ARPGs, advancing with market development, instead, turn out to be an digital media art, in which authors express their aesthetic appeal and value judgement. In order to help players achieve “Game Discipline”, Hidetaka Miyazaki revealed through Bloodborne that the utilitarian design exploits excessively game players’ consciousness.

Key words: ARPG, commensurability, flesh of world, Merleau-Ponty, reversibility