  We propose a conformity-driven reproductive ability in which an individual
$i$ is more (less) likely to imitate a neighbor $j$'s strategy if $j$'s
strategy is majority (minority) in $i$'s neighborhood. The results on the
evolutionary spatial prisoner's dilemma game show that, compared to homogeneous
reproductive ability, conformity-driven reproductive ability can greatly
enhance cooperation. This finding is robust with respect to different types of
network structures (including square lattice and scale-free network) and to
different ways of strategy updating (including synchronous and asynchronous
strategy updating).
