Unfortunately the difficulty I'm having here is that Johnston does not agree with Zizek precisely on the points we're discussing, namely the status of the Real as material/ideal, and the way free choice works. For instance Zizek has a Schellingian free act, while Johnston a Sartrean one. I'm assuming you haven't figured out yet which of those you agree with but I guess you generally accept their Heideggerian overall frame. In any case I have shown the problems with both of them.
I believe I already demonstrated precisely THAT point, that the brain's material and determining power over the subject as a whole are limited, that genetic AND external determinism are precisely not-All with regards to the subject.
I must have missed that, because all you did was claim that others have demonstrated it "scientifically". Again, if it's just a fact, there is no need for axioms. Clearly the facts don't demonstrate that the material structure of the subject is non-all. Before you run to the field of science for help again, stay within the domain of philosophy to logically prove the first axiom (non-all status of the onto-genetic base of the subject). I'm not against speculative philosophy, I'm against the bad philosophy of those whom Lenin named as 'degenerate chatterboxes who call themselves philosophers, flea-cracking university lecturers'. Frederic Jameson use of Badiou's more polite concept of 'anti-philosophy' is also appropriate.
You are only able to think the Real as Real, and not as also imaginary and symbolic. The Real of the body and the brain IS conflicted, leading it to this previously stated not-All.
No, you brought up the brain, so I'm just talking about the Real there. Of course zizek's application of the Real is not limited to this field only.
The claim that the Real of the body "IS" conflicted is exactly what no Lacanian/Schellingian manages to prove.
However as Symbolic Real, we re-encounter the notion that the Big Other of the socio-symbolic Real is simply inexistent.
Give an argument for your claims or do you think posting Lacan's word is enough? The fact that you "don't see a problem" with it or think it's "clear", is not an argument for TM.
Dark matter is an interesting METAPHOR for the Real, in that its existence is only deducible by its very absence. I don't think anyone here established a DIRECT correspondence between the Real and dark matter.
Good, but you are still being obtuse; nobody deduced the existence of dark matter by its very absence, they couldn't explain certain observations so they created the idea of dark matter. It could well turn out to have the same value as the idea of ether.



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I believe I already demonstrated precisely THAT point, that the brain's material and determining power over the subject as a whole are limited, that genetic AND external determinism are precisely not-All with regards to the subject.
You are only able to think the Real as Real, and not as also imaginary and symbolic. The Real of the body and the brain IS conflicted, leading it to this previously stated not-All.
However as Symbolic Real, we re-encounter the notion that the Big Other of the socio-symbolic Real is simply inexistent.
Nature as a whole is a mid-point between contingency and necessity.
Dark matter is an interesting METAPHOR for the Real, in that its existence is only deducible by its very absence. I don't think anyone here established a DIRECT correspondence between the Real and dark matter. The Real is the always existing gap in the realm of knowledge. Man is constitutively unable to know all. There are singular questions which have been around since the beginning of time which science will simply not be able to answer. But THIS isn't the point of our discussion.