This paper comes from Chalmers' website. He addresses the form of (Realist) Idealism that I have been exploring. Below I'll post some extracts mainly focused on problems with the approach and my responses to them. (My comments will be in brackets and blue.)
Idealism and the Mind-Body Problem
"When I was in graduate school, I recall hearing “One starts as a materialist, then one becomes a dualist, then a panpsychist, and one ends up as an idealist” ...
Idealist views like these are naturally understood as a sort of realism about the physical world, rather than a sort of anti-realism. The physical world really exists out there, independently of our observations; it just has a surprising nature. Indeed, views of this sort are highly congenial to epistemological structural realism, which says roughly that science reveals the structure of the physical world but not its intrinsic nature. So we can think of them as versions of realist idealism. Realist idealism may sound like an oxymoron, but this is only because we tend to associate idealism with the narrow anti-realist variety and ignore the broad variety. Correspondingly, the widespread view that idealism has been refuted or defeated is best understood as a view about anti-realist idealism.5 Certainly the most familiar objections to idealism are largely objections to anti-realist idealism. Realist idealism has not been subject to the same sort of searching assessment as anti-realist idealism. ...
From certain angles realist idealism can even be seen as a sort of naturalistic view (naturalistic idealism, perhaps?), on which idealism is put forward as a sort of scientific hypothesis to explain our experiences. ...
I will argue that all of these views face significant challenges, but that micro-idealism and especially cosmic idealism have some promise as an approach to these issues. ...
[Cosmic idealism, as Chalmers refers to it, is the approach that I have been exploring in the past year or two.]
Cosmic idealism is the thesis that all concrete facts are grounded in facts about the mental states of a single cosmic entity, such as the universe as a whole or perhaps a god ...
The sort of cosmopsychism that satisfies these constraints is constitutive Russellian cosmopsychism. To understand this view, start with a basic “priority monist” view (Schaffer 2010) on which the universe as a whole is fundamental, and on which it has fundamental cosmophysical properties: perhaps distributional properties concerning the distribution of matter in spacetime, perhaps wave function properties, or perhaps something else. Russellian cosmopsychism (in its experience-involving version) says that cosmoexperiential properties realize cosmophysical properties, by having their structure and playing their causal roles. In effect, cosmoexperiential properties are the causal basis of cosmophysical dispositions. Constitutive cosmopsychism holds that these cosmoexperiential properties collectively constitute (or ground) the macroexperiences of macrosubjects such as ourselves.
In effect, constitutive Russellian cosmopsychism is a view on which the world as a whole consists in the interplay of complex physics-structured experiential states in the mind of a cosmic subject. Russellian cosmopsychism gives cosmic experiences the structure and the causal role of physical states, while constitutive cosmopsychism allows macroexperiences to inherit a causal role from cosmic experiences. Cosmic idealism is certainly a form of constitutive cosmopsychism: if all facts are grounded in truths about mental states of the cosmic subject, then facts about macroexperiences are so grounded. Cosmic idealism does not entail Russellian cosmopsychism, but the most natural realist version of cosmic idealism is Russellian: the Russellian strategy seems by far the best way for cosmic mental states to ground states of the physical world.
What are the cosmic experiences like? We need not take a stand here. To start with analogs of familiar human experiences, the basic cosmic experiences might be perceptual: perhaps the cosmos undergoes a series of quasi-visual experiences roughly mirroring the evolution of the universe. They might be cognitive: perhaps the cosmos has a stream of conscious thought that mirrors the universe’s physical dynamics. They might be imaginative: perhaps the cosmos is in effect imagining states with the structure of the universe. Or perhaps most likely, these states may be quite unlike any human experience, with a distinctive phenomenology of their own that realizes the universe-level structure and dynamics of physics.
[Although I think Chalmers handles this well here, this issue comes up again later. What are cosmic experiences like? Perhaps they may be unlike human experiences. Perhaps? May? Do we think the experiences of a bat are anything like human experiences? There is no perhaps nor may. If states of the universe are indeed experiential states, we can rest assured they are nothing like experiental states of humans.
On this view, physics-structured states of the universe just are experiental states; therefore, there is an isomorphism between physics-structured states and experiential states; therefore, the experiential states of humans and the universe will be as similar and as different as their physical structure. (I personally find this to be quite intuitive.)]
What about the more general challenges for micro-idealism: holism and the combination problem? Holism is of course no problem for cosmic idealism, and it serves as one of the major motivators for moving from micro-idealism to cosmic idealism in the first place. Independently of idealism: if there are no fundamental physical micro-entities, this motivates a move to holistic physical entities such as the universe as a whole with holistic physical properties. In an idealist context, we need only combine this independently motivated move with the claim that these holistic physical properties are realized by mental properties. An analog of the combination problem, by contrast, is a significant issue for cosmic idealism and for related versions of cosmopsychism. This is the problem of how cosmic experiences can constitute the ordinary macroexperiences of subjects like us. In earlier work I called this the “decomposition problem”. Albahari (this volume) objects that this label makes it sound like the universe is decomposing, and recommends “decombination problem” instead. However, this awkward neologism is also somewhat misleading in suggesting that the universal mind must be a combination of the macrominds. Instead, I will use the simple label of the “constitution problem” for the issue of how the cosmic mind constitutes macro minds. As a bonus, this label can be used to cover the analogous combination problem for micropsychism (how do micro minds constitute a macromind?), bringing out that there is a unified problem for both views. As with the original combination problem, the constitution problem for cosmopsychism and cosmic idealism has at least three subproblems. The subject constitution problem is that of how a cosmic subject can constitute macrosubjects. The quality constitution problem is that of how cosmic experiential qualities can constitute macroqualities. The structure constitution problem is that of how cosmic experiential structure can constitute macroexperiential structure. All of these problems are serious. The quality and structure constitution problems are very closely related to the corresponding combination problems for panpsychism, and the range of options is similar (the main options discussed by Chalmers 2017 all apply here, with the same strengths and weaknesses), so I will set them aside here. The subject constitution problem is perhaps more distinctive in the cosmic case, and I will focus on it.
The subject constitution problem for cosmic idealism is that of how a cosmic subject can constitute macrosubjects such as ordinary human conscious subjects. It is at least not easy to see how this can happen, and there are arguments that it is impossible.
[This never ceases to confound me. If @smcder can shed any light on this, please do. Many philosophers of mind (including @Pharoah) seem to agrue that Subjects are fundamental. If this is the case, we should be discussing the Mind Body Subject problem, not just the Mind Body problem.]
A final strategy is to deflate subjects of experience or to eliminate them entirely. Views like this are familiar in the Buddhist tradition, which denies the existence of the self and is often understood to deny the existence of subjects as well (at least in ultimate reality). On views of this sort, there are experiences but no subjects that have them; or at least, any bearers of the experiences are very much unlike the primitive persisting entities that we have in mind when we think of subjects. This non-subject-involving view is often combined with a sort of idealism on which conventional reality is grounded in conventional appearances, and in which all this is grounded in cosmic experience at the ultimate level. This picture at least tends to suggest a view on which macroexperience is grounded in non-subject-involving cosmic experience in ultimate reality.
On a non-subject-involving cosmic idealist view, there is cosmic experience but no cosmic subject. It might then be argued that with no subjects there is no subject constitution problem to solve. Of course this does not eliminate the problem entirely.
Presumably experiences still come bundled into relatively unified groups (corresponding to what we thought of as subjects), and we still need to know how a cosmic bundle of experiences could constitute a macro bundle of the sort I seem to have. This problem is by no means straightforward (on the face of it one could run a conceivability argument against it analogous to the one for subjects), but perhaps the problems for it are at least more tractable than the corresponding problems for non-subject-involving views.
One cost is then to make sense of experiences without subjects of experience. I am not sure I can do this, but many theorists have at least tried, and again the view is certainly worth taking seriously.
[This is the approach I favor--a deflationary subject approach--regardless of the combination problem. I do not think "subjects" are fundamental. And this is actually a very important element of this approach which Chalmers fails to address, which I will at the end.
How could experiences come to be macro bundled? While this question is not completely answered of course, the response seems quite straighforward enough for me: organisms/brains persisting in time and space. If experiences, roughly speaking, are isomorphic to the physical structure of the universe, then we would expect to find physical structures that could constitute the macro "bundle" of experiences of our minds. Uh, I submit that human bodies/brains constiute the macro bundle that I seem to have...?
Regarding experiences without subjects of experience: I understand this is radical, but I don't find this hard to grok. I poor analogy is the tree falling in the forest. If no one (a subject) is there to hear it, does it make a sound? If an experience exists in the universe and there is no subject to experience it, is it still an experience?
Remember, the phenomenology of an experience is roughly isomorphic to its physical structure; thus the phenomenology of states of the entire universe need not be ANYTHING like the phenomenology of states of individual humans. That is, what it is like to be a bowl of water need be nothing like what it is like to be a human eating a banana. Or perhaps: if a state of the brain does not "enter" conscious awareness, does it make a sound? For instance, what if you're engrossed ina book and someone calls your name and you don't "hear" them, even though your nervous system absolutely responds physically?
What is the difference between a brain state registering someone calling our name that "enters" consciousness and one that doesn't "enter" consciousness? We have an "experience" with and without a subject of experience. This is very important and something that Chalmers does not address. I'll post a paper that does address this issue.*]
A related issue specific to cosmic idealism is the austerity problem. The issue here is that the cosmic mind in the present picture (whether relational or nonrelational) looks extremely austere, and very much unlike a mind as we normally think of it. Its basic experiential structure and dynamics is very much the structure and dynamics of physics. There seems to be little or no rationality in this structure. There seems to be very little thinking, valuing, or reasoning. It is not really clear why, if there is to be a cosmic mind, it should be as austere as this. The cosmic idealist faces a choice point here. On the first option, the cosmic mind has experiences that are wholly isomorphic to the structure of physics. This is the option taken by pure Russellian cosmopsychism, where the cosmic subject has mental states with structure and dynamics that realize physical dynamics, and has no more mental states and no more structure and dynamics than this. This option faces the austerity problem.
[Again, phenomenology = structure. The mind of the universe and the mind of an individual human will be as similar and as different as the structure of the universe as a whole and the structure of an indivual human. As they have differences in their physical structure we should expect their phenomenology to be vastly different as well.
Just because the mind of the universe on this view would be quite alien from a human mind is not grounds to dismiss the argument. That's like saying because the physical structure of the universe is different from the physical structure of a human, they both can't be physical.]
I conclude that there is significant motivation for cosmic idealism. It shares the general motivations for panpsychism, which are strong, and has some extra motivation in addition. Compared to micro-idealism, it deals much better with the problems of spacetime and of holism, and it at least has some extra promise in dealing with the problem of causation and the all-important constitution problem. Compared to non-idealist forms of panpsychism and panprotopsychism, it has some advantages in simplicity and comprehensibility, while it has both benefits and costs with respect to the constitution problem.
I do not know that the constitution problem can be solved, but there are at least avenues worth exploring. Overall, I think cosmic idealism is the most promising version of idealism, and is about as promising as any version of panpsychism. It should be on the list of the handful of promising approaches to the mind–body problem.
[That's pretty much as ringing of an endorsement as one can get. However, I strongly disagree that the combination/constitution problem is insurmountable for holistic realist cosmic idealism. Chalmers does't address the problems he sees as he refers to his paper on the combination problem--he thinks those problem apply to holistic realist cosmic idealism, I don't however. I'll explain why I don't think it's a problem in the future as it seems to be--in Chalmers thinking--the biggest challenge for this approach, relative to all the other problems that is, haha.]
I do not claim that idealism is plausible. No position on the mind–body problem is plausible. Materialism: implausible. Dualism: implausible. Idealism: implausible. Neutral monism: implausible. None of the above: implausible. But the probabilities of all of these views get a boost from the fact that one of the views must be true. Idealism is not significantly less plausible than its main competitors. So even though idealism is implausible, there is a non-negligible probability that it is true.
*
http://axc.ulb.be/uploads/2016/01/14-casys11.pdf
"Abstract: Here, I explore the idea that consciousness is something that the brain learns to do rather than an intrinsic property of certain neural states and not others. Starting from the idea that neural activity is inherently unconscious, the question thus becomes: How does the brain learn to be conscious? I suggest that consciousness arises as a result of the brain's continuous attempts at predicting not only the consequences of its actions on the world and on other agents, but also the consequences of activity in one cerebral region on activity in other regions. By this account, the brain continuously and unconsciously learns to redescribe its own activity to itself, so developing systems of metarepresentations that characterize and qualify the target first-order representations."
Why are some brain states "conscious" and other brain states non-conscious? Or, framed in the context of holistic realist cosmic idealism, if all states of the universe are conscious states, why are some of our brain states part of subjectve experience and some not? (This is the issue that Chalmers fails to address.) The above paper answers this problem, I believe. Note: the paper is not written in the context of holistic realist cosmic idealism, but plain old materialism. However, we know materialism can't answer the MBP, but the above paper combined with holistic realist cosmic idealism works.
Edit: I understand the above may be confusing. On a materialisy view, the question is: why are some brain states conscious and some brain states non-conscious? We know there is no materialist answer to this question. On the idealist view, the question is flipped: if all states are conscious states, why do some brain states seem to be non-conscious?
This is where the issue of subjects and subjective experience become so important!
On an idealist view, there is a difference between phenomenal consciousness and subjective experience. I've re-written the above abstract in the context of realist idealism:
"Abstract: Here, I explore the idea that
consciousness subjective experience is something that the brain learns to do rather than an intrinsic property of certain neural states and not others. Starting from the idea that neural activity is inherently
unconscious non-subjective, the question thus becomes: How does the brain learn to be
conscious subjectively experiential? I suggest that
consciousness subjective experience arises as a result of the brain's continuous attempts at predicting not only the consequences of its actions on the world and on other agents, but also the consequences of activity in one cerebral region on activity in other regions. By this account, the brain continuously and
unconsciously non-subjectively learns to redescribe its own activity to itself, so developing systems of metarepresentations that characterize and qualify the target first-order representations."
As I've suggested before, I think autopoeises is a wonderful model for how a non-subjective albeit experiential medium can take on a (physical) structure constituting subjectivity.
That is, while we can't see how phenomenal consciousness can emerge from (phsyical) structure, it's easier to see how, given phenomenal consciousness, subjectivity can emerge from (physical) structure.