Role specialization enables superior task performance by human dyads than individuals. - Asuka Takai; Qiushi Fu; Yuzuru Doibata; Giuseppe Lisi; Toshiki Tsuchiya; Keivan Mojtahedi; Toshinori Yoshioka; Mitsuo Kawato; Jun Morimoto; Marco Santello (Int. J. Robotics Res., 2026)