Abstract

It is often said that (M) "mind is an emergent property of matter." M is ambiguous, the reason being that, for all x and y, "x is an emergent property of y" has two distinct and mutually opposed meanings, namely: (i) x is a product of y (in the sense in which a chair is the product of the activity of a furniture-maker); and (ii) y is either identical or constitutive of x, but, relative to the information available at a given time t, x-statements are not analytic consequences of y-statements. If M is taken to mean that matter produces mind, then M is false, since biological activity obviously mediates mental activity and is therefore either identical with it or constitutive of it. If M is taken to mean that statements about mind are not analytic consequences of statements about matter, then M, though true with respect to the ontological relationship with between physical objects and the mental objects mediated thereby, says nothing about how statements about the physical bear on statements about the mental. This is a consequence of the fact that it is truths that are explained, not objects. (It is truths about trees, and not the tree per se, that are explained: one explains why the tree is tall, why the tree can't survive if the drought continues, etc.) So supposing that M is taken to mean that, relative to the information available at a given time, psychological truths are not derivable from non-psychological truths, then M is to the effect that, at that time, it isn't known how, or even whether, truths of the first kind bear on those of the second, in which case M is to the effect that it isn't known how to explain the mental in terms of the physical. Thus, depending on how it is disambiguated, M is either false or devoid of content. Further, as Hempel (1965) made clear, if M is taken to mean that, at a given time, statements about the mental cannot be deduced from statements about the physical, then it is ipso facto being left open whether, at some later time, relative to a more comprehensive data-set, statements about the mental are deducible from statements about the physical. A consequence of this, as Hempel stated, is that, if M is disambiguated in the second way, it is not to the effect that statements about the mental are incapable of being deduced from statements about the physical, and is instead to the effect that, at the time M is affirmed, it simply isn't known whether, or therefore how, such a deduction can be carried. And this establishes---what has already been established on independent grounds---that M is devoid of content if interpreted as a thesis concerning the way in which statements about the physical bear on---or, a fortiori, are explanatory of---statements about the mental. Thus, the statement that "mind is an emergent property of matter" is vacuous, so far as it isn't false.