Credit: Katsuhiko Sato
Members of the Laboratory of Mathematical and Physical Ethology, Research Institute for Electronic Science, Hokkaido University, to which authors of the paper Katsuhiko Sato (far right, dark blue puffer jacket), Takuya Chiba (front row, green puffer jacket), Yukinori Nishigami (back row, third from left, black jacket) and Toshiyuki Nakagaki (back row, second from left, blue jacket) belong. (Photo: Katsuhiko Sato)