Thinking about this further.
I do think my hypothesis that types that have ego functions in the same dichotomy, such as F/T, share preferences for particular regions of the brain corresponds to Model A's theory of dimensionalities. For example, EII and IEI share function dimensionalities and all the NF types have dimensionalities that are close to each other presumably because their amygdalas and right ventral hemispheric networks operate with roughly the same levels of sophistication.
I think this hypothesis still begs the question: if an IEI and EII have the same dimensionalities, what parts of the brain govern what's valued and conscious? What differentiates an IEI and an EII, neurologically speaking?
It's probably easy to sort out the consciousness aspect since it probably boils down to whichever neural pathways possess the strongest relationship to each other. It's a matter of general circuitry.
But what determines what functions are valued or unvalued? What does "valued" even mean, neurologically speaking?
Anyway, here's a study about intuition's relationship to the right hemisphere. Factor this in with what I posted about introverts and extraverts and you get an explanation for Ne and Ni.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3218761/
If you want to make socionics scientific, look for articles like this and do the math. You could probably patch it together. I expect you'll wind up with a messier theory than Model A, since "scientific socionics" is an oxymoron. By Gulenko's admission, part of the practice of socionics consists of art, as opposed to science. But yeah, if you view socionics as a hypothesis, then test it through research, you could find what parts of the hypothesis fit. New neurological research emerges every day.
Yeah, the question of what's valued will be tricky, though. I don't even know if the neurological community has an analogous term for what's "valued"; if they don't, they won't even be attempting to research it. If they don't, data revealed about such a thing is likely to be revealed accidentally. I also figure that, in reality, it's probably a catch all for general aspects of neurological makeup.