1. Artificial and Mechanical Intelligence, Center for Robotics and Intelligent Systems, Istituto Italiano di Tecnologia, Genoa, Italy
2. Florida Institute for Human and Machine Cognition, Pensacola, FL, USA
3. Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Champaign, IL, USA
4. Department of Information Technology and Human Factors, CNRS-AIST Joint Robotics Laboratory (JRL), IRL; National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan
5. Department of Applied Electronics, Faculty of Advanced Engineering, Tokyo University of Science, Tokyo, Japan
6. Inria, Loria, CNRS, Université de Lorraine, Nancy, France