The physicalist wants to claim that when you zoom-in on the world and un-mix the convoluted causal structures, then you will find that everything is grounded in more fundamental events or structures describable and predictable by physics, and you will find no additional stuff behaving according to different principles. — Apustimelogist
I well aware of physicalist claims, and that is a good description of it.
One of Charles Pinter's central arguments in Mind and the Cosmic Order is that science explains the world by decomposing it into simples—the smallest, causally interacting constituents: particles, fields, molecules, neurons. (This can be traced back to atoms and atomism, although the idea of a physical atom has since been displaced.) This method has delivered enormous explanatory power , but it also commits us to a very specific kind of explanation: one where wholes are derivative, and the only truly fundamental realities are the constituents and their interactions.
Charles Pinter highlights fundamental issue with this attitude. Organisms don’t perceive the world in terms of simples. The human and animal sensorium (the manifold of sensory impressions which constitute 'things' for animals and humans) works in terms of gestalts—unified, meaningful wholes: faces, trajectories, melodies, intentions, beings, and so on. These are not assembled bottom-up from atomic sensory “bits”; rather, they are the primary mode in which the world is disclosed to a subject. When we identify something, we identify a gestalt, not an assembly of simples. This is a basic fact of cognition.
A gestalt has properties that no list of constituent parts captures: unity, salience, meaning, intentional relevance. A melody is not found in the individual notes; a face is not found in the luminosity patches; a perceived threat is not found in isolated pixels or shapes. These features belong to the organization of the whole, not to the micro-level items. They, more than atomic simples, are the basic constituents of the 'life-world', the world of lived meaning. And Pinter demonstrates this is so, not just for humans, but even for insects.
The tension is this:
* Science’s ontology is formulated in terms of simples.
* Mind and perception operate in terms of gestalts.
(Hence you can see why I'm not appealing to 'non-physical substances'.)
A physicalist can say that gestalts somehow “emerge” from simples, but the challenge is to show how the features distinctive of gestalts—coherence, meaningfulness, aboutness—follow as a matter of explanation from the properties of the physical parts. Simply asserting neural correlates doesn’t do the philosophical work, because correlates explain when something occurs, not why its distinctive features exist at all.
The point is that the reductive strategy that works for chemistry or planetary motion is not obviously suited to phenomena whose defining characteristics are holistic, structured, and inherently perspectival. If explanation bottoms out in simples, yet consciousness and cognition are inherently gestalt-like, then either:
* the reductive framework is incomplete, or
* gestalts possess explanatory features not captured by simples, or
* a richer conception of nature is needed, in which organization, form, and perspective are not treated as secondary or derivative
This isn’t an argument against physics. It’s an argument that a scientific metaphysics based solely on simples faces a structural mismatch with the phenomena of mind, whose basic units are wholes rather than parts.
So while it may be true that 'we don't know the intrinsic nature of anything' that is far from the only problem with physicalism. As an explanatory paradigm, it methodically excludes the basis of meaning in cognition.
All description and explanation occurs in some kind of context where there are limitations or constraints, ultimately shaped by how brains process and use information. — Apustimelogist
Here, you're committing the 'mereological fallacy'. This is central to an infliuential book, The Philosophical Foundations of Neurosciences, Hacker and Bennett (philosopher and neuroscientist, respectively):
In Chap 3 of Part I - “The Mereological Fallacy in Neuroscience” - Bennett and Hacker set out a critical framework that is the pivot of the book. They argue that for some neuroscientists, the brain does all manner of things: it believes (Crick); interprets (Edelman); knows (Blakemore); poses questions to itself (Young); makes decisions (Damasio); contains symbols (Gregory) and represents information (Marr). Implicit in these assertions is a philosophical mistake, insofar as it unreasonably inflates the conception of the 'brain' by assigning to it powers and activities that are normally reserved for sentient beings. It is the degree to which these assertions depart from the norms of linguistic practice that sends up a red flag. The reason for objection is this: it is one thing to suggest on empirical grounds correlations between a subjective, complex whole (say, the activity of deciding and some particular physical part of that capacity, say, neural firings) but there is considerable objection to concluding that the part just is the whole. These claims are not false; rather, they are devoid of sense.
Wittgenstein remarked that it is only of a human being that it makes sense to say “it has sensations; it sees, is blind; hears, is deaf; is conscious or unconscious.” (Philosophical Investigations, § 281). The question whether brains think “is a philosophical question, not a scientific one” (p. 71). To attribute such capacities to brains is to commit what Bennett and Hacker identify as “the mereological fallacy”, that is, the fallacy of attributing to parts of an animal attributes that are properties of the whole being. Moreover, merely replacing the mind by the brain leaves intact the misguided Cartesian conception of the relationship between the mind and behavior, merely replacing the ethereal by grey glutinous matter.
You see, I think your approach is undermined by this reductionism, the conviction that basic physical level is the only real one, to the extent that you can't even consider any alternative. You simply assume that philosophy must defer to physics, as if that can't even be in question.
Pinter, Charles C.
Mind and the Cosmic Order: How the Mind Creates the Features & Structure of All Things, and Why This Insight Transforms Physics. Cham (Switzerland): Springer, 2020