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Issue No. 03 - Third Quarter (2012 vol. 5)
ISSN: 1939-1412
pp: 231-239
Lorenzo Masia , Istituto Italiano di Tecnologia, Genoa
Valentina Squeri , Istituto Italiano di Tecnologia, Genoa
Etienne Burdet , Imperial College London, London
Giulio Sandini , Istituto Italiano di Tecnologia, Genoa
Pietro Morasso , Istituto Italiano di Tecnologia, Genoa
We investigated how the control of a compliant object is realized by the redundancy of wrist anatomy. Subjects had to balance a one degree-of-freedom inverted pendulum using elastic linkages controlled by wrist flexion/extension (FE) and forearm pronation/supination (PS). Haptic feedback of the interaction forces between the pendulum and the wrist was provided by a robotic interface. By tuning the mechanical properties of the virtual pendulum and the stiffness of the elastic linkages it was possible to study various dynamical regimes of the simulated object. Twenty subjects (divided in two groups) were tested in four days performing the same task but with different presentation order. The stabilization strategy adopted by the subjects was characterized by primarily using the PS DoF when the pendulum was linked to stiff springs and characterized by a relatively fast dynamic response; in contrast, the stabilization task was shared by both DoFs in case of lower spring stiffness and slower dynamics of the virtual object.
Wrist, Torque, Springs, Haptic interfaces, Iron, Oscillators, Damping, exoskeleton wrist haptic device., Redundant wrist control, unstable dynamics

P. Morasso, E. Burdet, G. Sandini, L. Masia and V. Squeri, "Wrist Coordination in a Kinematically Redundant Stabilization Task," in IEEE Transactions on Haptics, vol. 5, no. , pp. 231-239, 2012.
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