With a see-saw, one side exerts force while the other side relaxes. They take turns. I think that is the concept that was being described. It is a question as to whether we support single threading or multi-threading.
I don't know the answer but it seemed like an interesting perspective.
I've also read that certain functions can only talk to certain functions - something to do with brain circuitry.
Why do you think two functions can operate simultaneously?
Do you think that more than two can run at the same time?
i think we need a cognitive neuroscientist in the thread...
i seem to remember from neuropsych class that with conscious thought, the mind has to switch back and forth, like a computer. we can multitask, and we can do it quick enough that it seems like both are going at once, but in reality, you lose a bit of efficiency in the time it takes to switch between the tasks - if the tasks use the same brain processes, that is.
but thinking about data input and memory storage, external processes and internal processes would occur in different places, so i would think they could be happening at the same time? i would also imagine one goes subconscious while the other is conscious. i think Ni is stereotypically subconscious - that "eureka!" moment, for example, breaking the surface seemingly out of nowhere. and Fi - when you have a strong value, you generally know right away when something clashes with it. you don't really need to actively think about it. and when you get the suspicion someone's lying, it's more of a general feeling that arises.
this would be interesting to think about in terms of combinations... if it were accurate, then would an ENFP have NeFi and TeSi as their typical patterns, or use NeSi and TeFi too? would they be more likely to use NeSi than TeFi? hmmm
this is all just thinking off the top of my head, tear it apart as you please lol