1. Department of Systems Medicine, Centre of Space Biomedicine, University of Rome Tor Vergata, Rome, Italy
2. Research Centre E. Piaggio and Department of Information Engineering, University of Pisa, Pisa, Italy
3. Laboratory of Neuromotor Physiology, Fondazione Santa Lucia IRCCS, Rome, Italy
4. Department of Applied Cognitive Psychology, University of Ulm, Ulm, Germany