Well, first, don't equate physicalism or materialism with being a Dennettian. Dennett and that ilk (the Churchlands, for example) are often considered eliminative materialists. Not all materialists are eliminative materialists.
I think that consciousness, and all mental phenomena in general, are physical/material, and no, i don't at all think that consciousness, qualia, etc. are an illusion. (Not to mention that the very idea of an illusion obtaining while not involving consciousness is incoherent.)
Re "explanations," are you talking about verbal (or lets say mathematical etc.) accounts of phenomena? — Terrapin Station
I’m taking a step back from your last post to me.
This isn’t so much to convince as it is an attempt to help you understand why physicalism can be incoherent to certain people, myself included.
Matter—hence, physical stuff—is commonly understood to be devoid of agency. By “agency” I intend the term’s commonly understood meaning of “ability to act on one’s own volition”. Metaphysically speaking, agency is neither randomness nor determinism. A billiard ball hit by another is, for example, therefore commonly understood to not have agency in how it behaves; it doesn’t decide where to go on account of its own volition but, instead, acts in deterministic manners. (By comparison, when humans and other animals are hit they will exhibit agency in their behaviors.) Matter, then, is commonly understood to be inanimate at all times—for it is devoid of agency.
If, on the other hand, one ascribes agency to matter, I then fail to see any metaphysical difference between the physicalism thus defined and the metaphysical position of animism—the latter being somewhat similar to panpsychism, an anima mundi, and so forth. But then, tmk, this would no longer be physicalism as it’s universally understood.
To sum up: Since physicalism proposes that everything is matter, and since matter is understood be devoid of agency, physicalism then upholds the complete absence of agency in the universe.
If physicalism is true, then all our awareness of agency—both personal and as it pertains to others—can only be considered an epiphenomenal illusion resulting from agency-devoid matter; more specifically, from agency-devoid brains.
Yet awareness is of itself inextricably converged with what we deem to be agency. It’s why we term living beings animate rather than inanimate—or a living brain animate and a dead brain inanimate.
As some in fact do argue, if everything is agency-devoid matter, then awareness itself can only be an illusion of animate being produced by inanimate matter—and would in truth not actually exist. This is argued not on grounds of what one is aware of but as an entailment of causal reasoning wherein the premise is that no agency can exist.
Top-down causation, after all, is a succinct means of addressing the agency of the whole over its parts. In this case, awareness’s agency over the structures of its brain; e.g., think in a certain way and one’s synapses will simultaneously, and in due measure, strengthen and become reinforced or decay and eventually vanish—this, obviously, within limits. Compliment this with awareness being itself resultant from bottom-up causation of neural interactions resulting in mind, and one does obtain a rough picture of awareness’s identity to its physical “substrata” of brain, for lack of better terms. Yet, because physicalism precludes the presence of agency, this very bottom-up + top-down approach to brain-mind relations would contradict the position of physicalism—for the bottom-up + top-down approach entails the presence of agency, i.e. of animate being, this rather than of strictly inanimate matter.
I venture that most would agree that it is awareness which ascribes truth values to all these conceptualizations and inferences. In other words, it is awareness that deems one conceptualization to be true and another one false. The faculty of so judging what is true and what is false being itself entwined with the agency of awareness.
Now, if the presence of awareness is an epistemic certainty, and if awareness entails agency (which—while intuitively true—is not that easy to philosophically evidence), this to me indicates that physicalism as just addressed is an erroneous conceptualization of reality.
So the issue here is not one of whether or not the earth beneath our feet is solid/material/physical on account of us perceiving it to so be, but one of how agency (or at least the illusion of agency) can come about if everything were to be agency-devoid matter, this as physicalism upholds.
Otherwise, without the presence of agency, one is for example left with the reality that all animate beings are actually inanimate.