Abstract

This paper puts forth two reasons to hold that at least some mental entities are not physical entities. First argument: Some mental entities (namely, pains and other qualia) cannot possibly differ from how they seem to be, and since this cannot possibly be true of any non-mental entity, it follows that some mental entities are not physical. Second argument: It is necessarily on theoretical grounds, as opposed to strictly experiential grounds, that mental entities are identified with physical entities. Water is legitimately believed to consist of microparticles of a certain kind because there is independent reason to believe that entities relevantly similar to such particles, supposing them to exist, are relevantly similar to water, so far as the latter can be directly observed. It is not, nor could it possibly be, on the basis of some directly observed concomitance between molecule-activity and water-activity that we believe the former to constitute the latter. It obviously isn't on the basis of any directly observed concomitance between brain-activity and mental-activity that the former is believed to mediate the latter. At the same time, there cannot possibly be any other legitimate basis for that belief. The reason for this is that nothing relevantly similar to mental activity can possibly be observed to accompany anything relevantly similar to brain activity. And the reason for the latter fact is that, even if brain-activity and mental-activity occur in the same physical space, they occur in different data-spaces: when you experience a pain, it is not given to you as occurring in the same spatial manifold as the falling of a stone or any other physical event. In general, mental events, whether or not they in fact have spatial coordinates, cannot possibly be observed (experienced) as having such coordinates, and for this reason they cannot be observed as having the same coordinates as brain-events. Thus, there can be no reason to grant the existence of the concomitances whose existence is needed to legitimate the bridge principles on the basis of which the mental could legitimately be identified with the physical. Note on the second argument: This argument doesn't show that the mental is non-physical; it shows only that there cannot possibly be any justification for the belief that the mental to be physical or, at any rate, that, if there is such a justification, it isn't comparable to the justification for the belief that water consists of molecules.