1. Sony Computer Science Laboratories, Inc., Japan and Embodied Cognitive Science Unit, Okinawa Institute of Science and Technology Graduate University, Japan
2. Sony Computer Science Laboratories, Inc., Japan
3. Embodied Cognitive Science Unit, Okinawa Institute of Science and Technology Graduate University, Japan
4. RIKEN Center for Brain Science, Japan
5. Sony Computer Science Laboratories, Inc., Japan and University of Maryland, USA
6. Sony Computer Science Laboratories, Inc., Japan and Okinawa Institute of Science and Technology Graduate University, Japan