Separated interactive behaviors promote cooperation in the spatial prisoner’s dilemma game Deming Mao, Xiaoyu Li, Dejun Mu, Dujuan Liu and Chen Chu Eur. Phys. J. B, 94 7 (2021) 148 Published online: 21 July 2021 DOI: 10.1140/epjb/s10051-021-00118-7