An Experimental Study on Balancing Tasks of Human Subjects in Cooperation With Invisible Artificial Partners

This paper studies coupled balancing tasks based on coupled inverted pendula (CIP) framework. We experimentally investigate the cooperative balancing task on a virtual CIP model, performed by a pair of an invisible artificial controller and a human subject, where experimental participants were not allowed to watch the movement of the artificial partner during experiments. The experimental result on Lyapunov exponents implies that the human subject seems to try to make the artificial controller neutrally stable as well as the visible case in our previous study. Therefore, the result implies that the visual feedback from the balancing state of the artificial partner may not be related to the dynamical property of human.