1 Human Robotics Group, Department of Physics, Systems Engineering and Signal Theory, University of Alicante, Alicante, Spain.
2 Intelligent Behaviour Control Unit, CBS-Toyota Collaboration Center, RIKEN, Nagoya, Japan.
3 Instituto Cajal, Spanish National Research Council (CSIC), Madrid, Spain.
4 Bionic and Rehabilitation Engineering Group, Department of Electrical Engineering and Automation, Aalto University, Espoo, Finland.
5 Neuromuscular Physiology and Neural Interfacing Group, Department Artificial Intelligence in Biomedical Engineering, Friedrich-Alexander Universität, Erlangen-Nürnberg, Erlangen, Germany.