Progress is possible by proceeding without an
ideal or supposed slash potentially mythical final set of scientific explanations (that a distant future or an advanced extraterrestrial civilization might offer).
Which is to say, brain correlates are nevertheless useful. Chinese alchemists had no idea how gunpowder explosions worked at a micro-level, but they knew that the recipe of ingredients (saltpeter, charcoal and sulfur) could in practical context be treated as the necessary provenance of such. And again, the data patterns and processing of machines -- even if regarded as minus corresponding experiences -- yields potent results and incremental ascension to desired robot behaviors.
Historically, we need to inspect how these "mind-body problems" came about to begin with. For instance, the view that it was the
dictums of Galileo and Locke that stripped phenomenal properties from matter or the "objective stuff" of that era:
Galileo thinks that shape, position, motion, contact, and number are in the objects [also with respect to future updates like mass and charge], while “tastes, odors, colors, and so on ...reside only in consciousness.” Shape etc. are called primary qualities. Color etc. are called secondary qualities. How best to draw the distinction is controversial...
Galileo's design argument for secondary qualities. (1) Experience has the features God designed it to have. (2) God doesn't care if experience is accurate [it's a representation]; he just wants us to react properly; pain is to make us pull back, foul-smellingness is so we won't eat. (3) Properties prominent in our experiences are not there in the object, unless also prominent in science. The red we see in the tomato is like the pain we feel in our foot. It is presented as in the tomato because that is where action needs to be taken.
Galileo's relativity argument for secondary qualities. (1) How an object looks (e.g.) is relative to one's sensory equipment; other creatures do or could see different colors. (2) These other creatures' experience is no less correct. (3) So there are no objective colors in the world; there are just color-experiences. --Galileo, Descartes, Berkeley, Locke, Kant ... Reason, Relativism, and Reality
The elements of another sub-category of representation -- writing systems -- likewise vary from culture to culture in terms of symbols and syntax. Relativity or lack of consensus across a spectrum of different parties and agencies is hardly something alien to the domain of matter. Not sufficient justification for exiling phenomenal qualities.
And obviously that banishment also occurring due to an archaic conflation of experience with the supernatural -- God and the lesser minds It mediates representations of a material world to -- has no place in today's natural methodological approach. Thus, the continued separation of primary and secondary properties (one abiding in matter, the other not) is arguably groundless -- nothing more than unthinking tradition or lack of critical analysis being applied to the momentum of an outdated habit.
"Russellian materialism" and/or its affiliates and spin-offs, would thereby simply be restoring the original situation prior to these religious accommodating dichotomies of the past. Attacking the source of a "hard problem" rather than treating the symptoms.
The rival category of thought, where the displaying residents of consciousness are a radical novelty or new level brutely emerging without precursors, is just dualism in disguise. Since this supposed parallel "field" or "dimension" (who knows what such babble is precisely waving at) cannot even be publicly detected by instruments, that is conjured by the operations of a biological or technological substrate.
And at some point the asymmetrical ludicrousness of how we could be aware of the various manifestations of consciousness if they have no reciprocal effect (lack causal contribution to neural activity) will become apparent to even those who ignore the extended consequences or inconsistencies of their conceptions. Epiphenomenalism is just another brand of dualism.
Minus that latter baggage of the past, the only road for science (with respect to any serious attempt to deeply address the exhibited affairs of experience rather than flitting superficially about on that territory) is to eventually grant that matter does not consist of just extrinsic relationships, but has an intrinsic, non-abstract manner of existence that is exploited by cognitive systems to produce the complex experiences associated with a brain (whether the manipulated building blocks are qualia or yet more primitive presentations).
If you or another proposal-maker believe it is figuratively helpful to conceive of the manifestations of consciousness as abiding in some "space" of their own, then the latter could be incorporated in that "internal" character of matter, so to be construed as harmoniously causal with the "external" character. Again, the two sides of the same coin metaphor, rather than being distinct spheres of introduced (artificial) dualism schemes and the potency problems that usually arise for one of those in naturalism's conceptual preferences.