I think you are just making up what you think the 'soul' and 'unity' ought to be, but there is no real reason to accept your idea of what it is.
Well, it's not my definition. It was originally Plato's, then the church's, then Descartes, etc. I'm not sure how to make sense of a non-unitary immaterial "substance", "thing", whatever. What would that mean?
Really? I think when one is speaking about metaphysics, pretty much anything is possible and nothing can be rules out, which makes it rather difficult to make claims that something as vague as 'unity' is completely different from something we perceive as a unity.
Well, the definition of a soul was always that it was a unity, a single immaterial substance that constituted what we are. Of course, we could always try to come up with a different definition, but I don't know how a non-unitary immaterial "thing" could make any sense.
The same is true for messing with your telly. There really is no necessarily discernable difference between the brain as a receiver of the soul and the brain as the producer of the mind. It is just what one choses to believe.
But if the brain is the receiver of the soul, it must do it somehow. One proposal has been the wacko QM solution that has the microtubules picking up the collapsing wave function of the universe serving as the soul. If that were the case, then removing large parts of the nondomiant frontal cortex should have more effect on the "soul" than pinpoint damage to the upper brainstem. The one is almost imperceptible, the other causes deep coma. If the soul is, as has been previously defined by others, a unity, then it seems as though any damage to the brain should cause perturbation of the entire soul-brain process. Having a localized tuner for the audio component of a TV signal makes sense. Having a localized tuner for audition created through an immaterial unity doesn't. There is also the issue of not only long-term memory, but also procedural memory. The brain can't simply be a tuner or receiver. It also does things. It acts. How does it do that as a tuner? And how does it remember how to brush my teeth? TVs do not act in that fashion.
You can't assign probabilities to metaphysical concepts, because they cannot be clearly defined. If you disagree, tell me which is more likely: that Golliboggelotz exists or that Golliboggelotz does not exist?
Sure we can. We do it all the time. We think it is more likely that our TVs work by high-def signals hitting a receiver and translating the images into something pleasing, at least when Tammy Fay Baker isn't on. I don't think it likely that there are pixies acting out
24 inside a box in my house. Different metaphysical possibilities have differering degrees of evidence supporting or not supporting them. I cannot prove that pixies do not act out
24 or
The Daily Show inside that box, so I cannot completely rule out different metaphysical propositions, but I can surely assign probablities to them.
That does not provide us with evidence against a receiver concept. My television set also uses a whole heck of a lot of energy.
That wasn't my point. The point was that we know what happens when we turn off the ion channels -- brain activity stops and the "mind" stops. And we are able to model thinking that uses a similar paradigm in our computers -- the yes/no or 1/0 model that our brains use, although nervous tissue is much more complicted. The issue is not that you can also turn off a TV and get no signal, but that those metabolically active cells that are supposed to be just dumb receivers are modelled by other supposedly dumb silicon bits that can do some amazing things, like add and subtract. When they are not metaboliclly active, the cells are still there. They should still be able to receive a signal, but they don't.
We also know that if we stimulate certain nerve cells we can recreate activities that are supposedly the result of the "mind". We can stimulate neurons that generate memories, that produce movement, etc. We can't do that with a TV set. A TV set can receive its input and translate it. A brain can accept what would otherwise be random stimulation and produce recognizable activity. The best you could get with a TV set with random stimualtion would be a non-informative flicker. Not the same as with a brain.
Claiming that there is no need to suggest such an entity is taking a philosophical stance. It is not a philosophical justification for taking that stance. Saying that you do not see the need to suggest Golliboggelotz exists does not convince someone who does see that need.
That's not what I'm claiming. We can assign probablities to different philosophical stances based on the available evidence. That does not provide definitive proof, no argument there. We do not add unecessary baggage onto explanations but prefer to be the most parsimonious that we can be.
Problems that only arise when you take a pragmatic deductive-nomological stance on philosophy, which is of course a very useful stance to take if you don't wish to worry too much about the hard problems philosophers have created for themselves. But it is a belief nonetheless.
Since your stance seems to be that you just can't tell the difference anyway (everything is possible in metaphysics), I'm not sure what the point of this last bit is.