Originally posted by dadudemon
No, you're right: neuroimaging is strictly correlational as we cannot measure the exact data firing on every individual neuron and then accurately piece that back together and paint a proper picture of the region that activated. We can make very strong conclusions based off of those correlations, however.
not exactly... the reason fMRI is "correlational" is because it measures BOLD response (blood oxygen level) rather than direct neuronal firing, not simply because it doesn't take into account every possible piece of the puzzle. I think this might be better defined as "indirect" or "inferrential", because it is really only correlational in the way that you letting go of a ball is correlated to it falling.
Something like EEG isn't correlational at all, as you are measuring the actual summation of neuronal activity, rather than the system that feeds that activity (blood oxygen), however, it is notoriously unable to determine location or these "specific parts" as you are saying. That is an issue with what is called "spatial resolution" though.
Basically, even if you had the ability to image individual neurons and their connections in fMRI, it would still be "correlational [😠]", because you are measuring the blood/oxygen that is supplying that neuron, not the neuron directly.
Again, I think "indirect" is a better description
Originally posted by dadudemon
Anyway, I think your suggestion of different subconscious systems makes what you said, make sense. One study measured near primal reactions in an indirect way. What you spoke about in the other post was subconscious motivations for certain actions. While not entirely mutually exclusive, it makes sense that they would be different systems. I would like to refer to these as "background processes" that propagate out, via triggers, into the conscious. The system that prompts some, subconsciously, to wake up and take a piss is not the same system that heightens a person's awareness to violence and makes them have more aggressive thoughts. Different "subconscious" systems, for sure.
motivations are difficult too. Notice, I haven't said we could throw louchner in a fmri and determine why he did this (unless there is some unprobable thing like a tumor). Those things would be only really amenible to the indirect measures I was talking about in the other thread.
Like, the Libet studies, that show rediness to action before motivation, never actually measure this sort of "abstract motivational whatever", but rather measure parts of the mind unrelated to consciousness, to see whether they precede or follow conscious awareness of an item.
I think I'm even going to change my answer there... its not exactly that they are different "subconsciousnesses", but that we define so much as "subconscious" that it can't help but include things like abstract meaning and basic motor readiness. Yet another reason why the term is useless...
Originally posted by dadudemon
So, really, it's a symphony of subconscious systems operating as "background processes" until specific triggers or conditions are met to process those systems in conscious thought.
no...
it is a single system where only a very small percentage of activity is made available for explicit awareness. There are some ideas and interesting results, but there is still no way to identify what is "conscious" and what is "subconscious" processing, in fact, as I said above, that is likely an irrelevant distinction.
argh, and here is where stuff gets all confusing, and why I hate these labels anyways, but think of it like this, what is "subconscious" and what is "autonomic"? is your heart rate part of "subconscious processing"? normally not, but if your heart rate is elevated, and you don't have an immediatly available response, the simple fact can lead you to become anxious or whatever. Basically, your brain says "oh, the heart is racing, there must be a reason, I can't think of one, but there must be, I must be anxious!" (ok, not exactly, but a lot of this is nearly impossible to describe in jargon, let alone layman...). In this instance, the heartrate caused the anxiety, so is the heart part of your subconscious mind?
Alright, at the risk of just rambling now, let me try and use an example I like:
In a vaccum, a rock and a feather will fall at the same speed (gravity is a constant, no drag). I know this as a fact, explicity. However, if I ever were to see someone perform this experiment, it would be very counter-intuitive to my implicit mind. It goes against everything that this "subconscious" mind knows. Now, I know for a fact that they will fall at the same speed, but I can't actually use that information to change the way my mind reacts to the actual event. Similarily, knowing that the rotating snakes in that illusion are actually stationary makes me no more able to surpress the perceptual experience.
It tends to be called "bottom up" in the stuff I do, whereas the explicit is "top down", and if you want, I can get into why I don't like those terms either. Long story short, almost all connections and pathways in the brain are two-way: information flows top down, top-up, down up, down down, laterally, laterally down than up two steps then down then laterally again to come down so it is lateral to where it began... etc