 Such criticisms become difficult to evaluate given Davidson’s a priori procedure for establishing the token-identity thesis. He can respond that we already know, a priori, that any particular mental event must instantiate some physical property if it causally interacts with any mental or physical event, given the cause-law and anomalism principles. Questions about how this physical property, whatever it is, relates to properties currently invoked in neuroscience come later and are necessarily secondary to this monistic conclusion. And there is no guarantee (indeed, it is quite unlikely) that neuroscientific properties currently in vogue are candidates for strict-law properties. As we have just seen  (5.1),  Davidson eventually came to explicitly associate the physical properties that cover mental events with broad descriptions covering large space-time regions. Further, it would confuse epistemology with metaphysics to insist that, because we can only establish which physical property some mental token event instantiates by leaning on some type-correlations between other mental and physical properties, token-identity claims presuppose type-identity. How we discover the particular physical properties is one thing; whether there can be psychophysical laws is quite another, and not settled by the method of discovery.