IEEE transactions on neural systems and rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society | 13 Dec 2012
L Vaisman, L Dipietro and H Krebs
Following two decades of design and clinical research on robot-mediated therapy for the shoulder and elbow, therapeutic robotic devices for other joints are being proposed: several research groups including ours have designed robots for the wrist, either to be used as stand-alone devices or in conjunction with shoulder and elbow devices. However, in contrast with robots for the shoulder and elbow which were able to take advantage of descriptive kinematic models developed in neuroscience for the past 30 years, design of wrist robots controllers cannot rely on similar prior-art: wrist movement kinematics has been largely unexplored. This study aimed at examining speed profiles of fast, visuallyevoked, visually-guided, target-directed human wrist pointing movements. Thirteen hundred ninety-eight (1398) trials were recorded from seven unimpaired subjects who performed centerout flexion/extension and abduction/adduction wrist movements and fitted with nineteen models previously proposed for describing reaching speed profiles. A nonlinear, least-squares optimization procedure extracted parameters sets that minimized error between experimental and reconstructed data. Models performances were compared based on their ability to reconstruct experimental data. Results suggest that the support-bounded lognormal is the best model for speed profiles of fast, wrist pointing movements. Applications include design of control algorithms for therapeutic wrist robots and quantitative metrics of motor recovery.
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