| | I appreciate most what Bill has had to say on this. I'd like to add my own perspective, which I think is similar to his...
What we call "matter" never occurs apart from some entity, however nondescript the shape or tiny the size. So, it makes the most sense to regard matter not as a kind of thing or entity that does things (as we might say "the causal efficacy of matter"), but as a (complex) attribute of an entity, by virtue of which the entity can (i.e., has the capacity to) do certain things. In other words, in general, matter is the capacity of an entity to act in some way.
This is the original Aristotelian sense of the term "matter" and "material," and it is less misleading than the modern materialist notion that turns matter into an entity, rather than an attribute/capacity of entities. We usually use the terms referring strictly to physical attributes/capacities, but Aristotle used it more generally.
And, so far as we know, there are no entities that are not also material in their attributes/capacities. So, it makes sense to refer to all entities as "material entities." (There are no other kind, except metaphorically, as we might refer to an idea -- an action and stored content in the brain -- as an "immaterial entity.")
Since life is based on the structure and function of the DNA molecule, "life" too never occurs apart from some entity, viz., a material entity. Life is a (complex) attribute of a material entity, by virtue of which it can do certain things. So, life is a form of matter (in the general sense); i.e., the attribute life is a special category of the attribute matter.
Similarly, since consciousness (as we have so far discovered it) is based on the structure and function of nerve cells, "consciousness" too never occurs apart from some entity, viz., a living entity. Consciousness is a (complex) attribute of a living entity, by virtue of which it can do certain things. So, consciousness is a form of life; i.e., the attribute consciousness is a special category of the attribute life.
Thus (to fill out the syllogism), consciousness, like life, is based on the structure and function of the DNA molecule, so "consciousness" too never occurs apart from a material entity. Consciousness is a (complex) attribute of a material entity, by virtue of which it can do certain things. So, consciousness is a form of matter (in the general sense); i.e., the attribute consciousness is a special category of the attribute matter.
This does not "reduce" consciousness to matter, or conscious entities to material entities, any more than an analysis of water as being composed of oxygen and hydrogen atoms, which are in turn composed of certain numbers of electrons, protons, and neutrons reduces water to subatomic particles. The functions and capacities (attributes/actions) are hierarchical and developed that way, whether through strictly chemical or biological or psychological processes. And no level of the hierarchy is "less real" or "more real" than the others.
Yet, just as we cannot say that matter has "causal efficacy," nor can we say that consciousness has "causal efficacy." Efficacy is power or capacity, and what has power or capacity are entities. The power/capacity that entities have are their attributes, so rather than saying that matter or consciousness have causal efficacy (which suggests a Cartesian world of two substances duking it out through some mysterious form of causal interaction), we should be saying that matter and consciousness are the causal efficacies (powers) of certain entities to do certain things, by virtue of those powers/attributes.
Naturally this has various implications for the mind-body problem (which is only a problem if you view consciousness and matter as different kinds of stuff somehow interacting) and ultimately the problem of free will. But I'll stop at this point, in case people want to explore this point a bit before developing it further.
REB
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