  If such a weakening seems to amount to epiphenomenalism, you might look for an inheritance solution on which mental properties are efficacious in the same sense that their physical realizers are (compare the “homogeneity assumption” in Crane 1995). How can this be done without violating No Overdetermination? Well, suppose that a mental property is, in spite of being distinct from its physical realizer, immanent in this realizer; M, that is, is somehow nothing over and above P. In that case, any causal work done by P is, in a straightforward way, inherited by M. Overdetermination is avoided because M’s work is included in P’s.