There’s nothing new under the sun, so the first thing I’d like to know is which philosopher I’m accidentally plagiarizing with these ideas. Other comments and criticisms are welcome, too.
Materialism and Dualism as I see them, and as they were originally conceived, are both quite dead. The universe is not composed of little indestructible spheres colliding with each other. There are forces and waves and currents and laws and all sorts of weird things going on which transcend the limitations of ‘materialism’ so called, though of course the definition of materialism has been expanded and loosened over the years to try to keep up with all the new discoveries.
This expansion of definition has vicariously destroyed substance dualism, as well. Were an angel to land in Times Square and begin performing miracles, the mere fact that it can be seen, heard, and perform actions upon the world around it would be sufficient to render it ‘material’- scientists would propose the existence of an ‘a-particle’ with a few qualities based on the angel’s nature and activities, and that would be that.
All materialism really says, now, is that everything is connected through the same set of physical laws- all the strange forces, particles, waves and so on in the universe are unified through the fact that they act on each other in regular ways that math can describe. That’s the beginning and end of materialism- the ‘substance’ of it is gone, all that’s left is the idea of a unified process.
Causative Dualism, as I'm calling it then, is my proposal that there is, in fact, more than one such process. We can call all the laws of physics that describe how things move and react with each other 'physical causation'. There is another process, I would claim, which is closely related to questions of free will and such, which I will call here 'volitional causation'.
One important note about volitional causation is that it is non-deterministic, while still being appropriately called 'process', and even causative. This is a tough idea to understand for people that are used to thinking in terms of causative monism (materialism), which is most of us. But loosely, the idea here is that there is a connection between "P desires X" and "P acts to acquire X" which is non-random and understandable without being deterministic. If one asks "What other alternative is there between random and determined?" the answer is that volition IS the alternative. The only way to understand volition is to simply reflect on one's only experience of acting with respect to one's desires- the non-determined, non-random nature of volition is there to be seen. It resists description because
1.) The only words we have to describe it are either synonymous, or else borrowed from deterministic vernacular and thus wrong.
2.) For the same reason that the precise nature of deterministic causation resists description- whatever that reason may be, we are stuck with an intuition that there is a difference between ‘cause’ and ‘constant conjunction’, but that intuition cannot be made explicit, only directly understood. Material and Volitional causation are alike in this respect.
Causative Dualism has it’s biggest impact in how we imagine brain/mind interaction. This is best shown with a diagram, which I’m not net-savvy enough here to reproduce, but I think I can describe the diagram well enough for any reader to imagine.
Picture a string of numbers - 1, 2 3, 4, 5, 6 … on as far as you need. Call this a series of brain events.
Picture, above it, a string of letters- A, B, C, D, E… and so on. Call this be a series of mental events appropriately related to the brain events.
Now imagine arrows connecting the letters to the numbers (and to each other) according to what causes what.
Ordinary materialism (when it bothers to acknowledge mental events at all) follows this pattern: 1 causes 2 and A, 2 causes 3 and B, 3 causes 4 and C, etc.
If you draw this out, you’ll have a string of causes going through the numbers, and vertical lines shooting up to the letters. The mental events cause nothing, they are merely caused in addition to the physical events- this is epiphenominalism.
Supervenience and Property Dualism are a little different. In this case, you have a set up like this: 1 and A cause 2 and B. 2 and B cause 3 and C. 3 and C cause 4 and D.
IF you draw it out, you’ll have a string of causes running through the brain events, another running through the mental events, and criss-crosses connecting each sort of event to the next one in the series of the opposite line. The idea here is that EITHER the brain events and the mental events are two descriptions of the same phenomenon, or that the brain events and the mental events are different, but must always be considered together- they always exist together, and always cause the next pair in the chain together.
Here’s where Causative Dualism is different from Property Dualism. In Causative Dualism, the chain goes like this- 1 causes A. A causes B. B causes 2. 2 causes 3. 3 causes C, C causes D, D causes 4.
Draw it out, and you have a single line that threads up and down through the brain and mental events, looking rather like the edge of a castle wall.
As you can see (I hope), this means that some mental events are purely caused by other mental events - through the process of volitional causation- while at the same time, every mental event still has a physical event in the chain that it corresponds to- either causing it, or caused by it. With this system, no mental event need go without physical representation, but that representation need not be causative.
One of the benefits of this system is that it frees mental life from very specific embodiment. That is- we can easily see how there can be meat minds and machine minds and energy minds and…I dunno, ghost minds or whatever, because volitional causation has it’s own identity independent of how matter works. We already sense this to be true anyway- if there is a volitional rule that goes something like “I want it so I try to get it”, we can see the sensibleness of that rule without adding “because my brain is made of meat”. If there’s angels or true A.I. robots, we would expect them to try and get the things they want.
At the same time, causative dualism doesn't force us to propose some kind of stuff that we can't perceive or understand. There need not be any such thing as mental substance- since all we're talking about are a unique set of rules of causation, these rules can play out in the medium of meat as easily as some other medium.
Lastly, interaction between different sets of rules is much easier to understand than interaction between different types of substances. It’s a classic problem of dualism that it seems to make no sense that purely mental stuff could act on a physical world without being in some way physical itself. Laws don’t have this problem- consider the statement,
“If it doesn’t rain, I will be the short stop in tomorrow’s baseball game”.
The laws that govern whether or not it will rain are completely different than the laws of baseball- nobody writing a book about baseball would include a section on climatology- and yet, it is perfectly reasonable to us that the outcome of a system operating on one set of laws can impact a system operating on another.