  One possibility is that truthmakers for psychological truths include irreducibly mental properties. This is not the only possibility, however. Another is that psychological assertions are made true by physical states and properties, states and properties answering to predicates belonging to physics and chemistry. A view of this kind (which is close to Davidson’s as spelled out in §5 and to the identity solutions discussed in §6.5) would endeavor to resolve the problem of mental causation, not by tinkering with the causal concept, but by rejecting the idea that mental and physical properties are distinct kinds of property. All parties agree that mental predicates and descriptions differ from physical predicates and descriptions. Application conditions for mental terms and physical terms diverge in ways that preclude definitional reduction of the one to the other. Perhaps it is a mistake, however, to move from this linguistic fact to a substantive ontological thesis: mental and physical predicates designate properties belonging to distinct families of properties.