The Open Thread posted at the beginning of the month has gotten really, really big, so I've gone ahead and made another one. Post your new discussions here!
This thread is for the discussion of Less Wrong topics that have not appeared in recent posts. If a discussion gets unwieldy, celebrate by turning it into a top-level post.
This comment is a response to the claim that Gould's separate magesteria idea is not conceptually coherent. While I don't view reality parsed this way, I thought I would make an effort to establish its coherence and self-consistency (and relevance under certain conditions).
In this comment, by dualism, I'll mean the world view of two separate magisteria; one for science and one for faith. There are other, related meanings of dualism but I do not intend them here.
Physical materialism assumes monism -- there is a single, external reality that we have a limited knowledge and awareness of. Awareness and knowledge of this reality come through our senses, by interaction with reality. Dualism is rejected with a straight-forward argument: you cannot have awareness of something without interaction with it. If you interact with it, then it is part of the one reality we were already talking about.
Dualists persist: The empirical reality X that physical materialists recognize is only part of everything that matters. There is also a dual reality -- X', which is in some way independent of (or outside of) X. The rules in X' are different than the rules in X. For example, epistemology (and sometimes even logic) appears to work differently, or less directly.
Some immediate questions in response to dualism are:
(1) If we are located in X, how does interaction with X' work?
(2) Is it actually coherent to think of some component X' being outside of X? Why don't we just have X expand to absorb it?
Relation to the Simulation Hypothesis
An immediate, possibly too-quick answer to the second question is 'yes, dualism is coherent because it is structurally isomorphic to the simulation hypothesis'. If we were in a simulation, X and X' would be a natural way to parse reality. X would be the simulation and X' would be the reality outside the simulation. Clearly, the rules could be different within X compared to within X'. People simulated in X could deduce the existence of X' in a variety ways:
(a) by observing the incompleteness of X (for example, the inexplicable deus ex machina appearance of random numbers)
(b) by observing temporal, spatial or logical inconsistencies in X
(c) Privileged information given to them directly about X', built into the simulation in ways that don't need to be consistent with other rules in X
While dualists aren't claiming that empirical reality is a simulation, by analogy we could consider that (a), (b) or (c) would be cause for deducing X' and having a dualistic world view. I will visit each of these in reverse order.
Re: (c) Privileged information given to them directly about X', built into the simulation in ways that don't need to be consistent with other rules in X
Many (most?) religions are based on elements of divine revelation; special ways that God has of communicating directly to us in some way separate and independent of ordinary empirical experience. Being saved, speaking in tongues, visions, etc. I've heard it argued here on LW that this sort of experience would be the most rational reason for theism; they might be delusional but at least they are basing their beliefs on empirical sense experience. They would be justified in having a dualistic world view if they perceived their visions as distinct from (for example, having different rules than or existing in a different plane than) empirical reality. However, many theists (including myself) do not claim experience of divine revelation.
Re: (b) by observing temporal, spatial or logical inconsistencies in X
I think that in the past, this was a big reason for belief in the spiritual realm. However, the success of the scientific world view has shot this completely out of the water. No one believes that X is inconsistent; while there are 'gaps' in our knowledge, we have limitless faith in science to resolve everything in X that can be resolved, one way or another. Outside X is another matter of course, which brings us to (a). I proceed to (a) with the counter-argument to (b) firmly in hand: reality is explainable and whether we know the rules are not, there are rules for the phenomena in X, and rules for the rules in X and, if not rules, than a necessary logical deduction that can be made.
Re: (a) by observing the incompleteness of X
Can everything in X, in theory, be explained within X? If you believe this, then you have no reason to be dis-satisfied with monism. (It happens that I am a monist.) But what if we could point to just one thing that could not be explained in X? Just one thing that could not even be explained in theory because to do so would result in some contradiction in X? Would that give us cause to deduce X'?
Example 1: True Randomness
There are many processes that are approximated as random. The diffusion of a dye in a liquid, the search path of an amoeba looking for food, the collapse of a symmetric structure to one direction or another. However, all of these processes are considered deterministic -- if we knew all the relevant states of the system and had sufficient computing power we could accurately predict the outcome via simulation; no random numbers needed.
Nevertheless, there are some processes that appear as though they could be truly "random". That is, occurring spontaneously independent of any mechanism determining the outcome. For example, the 'spontaneous' creation of particles in a vacuum, or any other phenomenon described in an advanced physical journal with 'spontaneous' in the title. I think that you are a self-consistent physical materialist, you should deny the possibility of random or spontaneous events. I do: I think there must be a mechanism for everything, whether we have access to knowledge of it or not.
To the best of my knowledge, our understanding of these 'spontaneous' phenomena leaves room for mechanical explanations. Maybe this and that are involved, we just don't know.
Yet quantum mechanics is beginning to reveal ways in which a scientific theory could predict the inconsistency of non-randomness. Bell's theorem is close, proving that information in some cases is exchanged without a local mechanism. Fortunately, there is still room for other interpretations, including non-local mechanisms and many-worlds.
Example 2: Objective Value
Of any kind, including objective morality. This remains an unsolved problem in physical materialism, if you insist upon it, because it's existence seems dependent upon some authority (e.g., a book) that we have no evidence of in X. If a person believes in objective morality a priori, they may be a dualist since they deduce the existence of such an authority, embedded within X, but distinct from X in that it cannot be directly observed or interacted with. (Its existence is only inferred.)
Example 3: Consciousness
Another unsolved problem in physical materialism. I'm not familiar with them, but I understand that some dualists have arguments for why consciousness could not be explained within X.
My Position
It is often logistically difficult to defend a position you don't represent. The reason for this is that criticisms against the position will be directed at you personally, even though you hold you do not hold the position, and then further you might be tempted to continue defending the position with counter-arguments, which further confuses your identity. I am sympathetic to the dualist worldview as coherent and rational, but not globally scientific. I greatly prefer the physical materialist, scientific worldview. I have a very strong faith that everything in X can be explained within X; this faith is so strong that I consider it theistic, and call myself a theist.
This is thorough enough and long enough to merit posting as a top-level, IMO.