I'm not really sure how you came up with that conclusion, and I'd appreciate if you could explain a bit further. ^^
the way the brain works is that decisions are made either emotionally or with our reasoning. the emotional decision making is based off of trial and error: when we are anticipating something, the brain releases small amounts of dopamine, then when we do something right, the brain rewards itself with a larger amount of dopamine; when we do something wrong, it cuts off the dopamine. i usually like to think of it like this: when i'm playing chess and i make a move that ends up being great for me, i feel great. its almost a rush. if it ends up being bad for me in some unforseen way, i feel stupid and defeated, because my brain is punishing itself. in this way, the brain learns to avoid such behaviors that will cause it to cut off dopamine. we don't have to consciously think about this process, its happening "behind the scenes".
the rational decision making is a slower, conscious type of thought process, using logic and reason. we have to think through the cause and effects, the line of clues leading up to some conclusion. its the difference between the parent that lets their kid stick the fork in the toaster and the parent that tells their kid the reasons why its a bad idea: in the former the kid will learn, through his emotional center, that its a bad idea. in the latter the kid will know
why its a bad idea, but won't intuitively know that it is the way they will with the former.
of course, one interesting thing about the human brain is that it can rationalize the decisions we make with our emotional decision making center, but thats a different thread on its own.
well, with that all said and done, the theory that i've conconcted is that introverted thinking (Ti) and introverted feeling (Fi) are both centered in the rational part of the brain. one has to lose the notion that F = emotional. these are both 'logic' oriented functions, as they both take conscious thought and reasoning to make conclusions, they simply use different lines of reasoning. to be fair, both functions could be said to be 'feeling' as both of them are just as subjective as the other, one is simply using logic that focuses on a detached perspective while the other uses a logic focused on internal values.
the fact that we predominantly use the slower reasoning function could account for our perceived indecisiveness and procrastination.
on the other hand, extroverted thinking (Te) and extroverted feeling (Fe) are emotional decision making processes, happening in the unconscious part of the brain. this is why INTP's don't have to consciously 'chameleon' the way they do using Fe. this is why an INTJ is much faster at decision making then an INTP: because they don't have to sit around and think about it using their reasoning center, they
do first and rationalize afterwards (and the shadow Fi could account for their stubborness for their own ideals). this is why 'J' people do things off of hunches and intuition; they can know something without having to have spent a lot of time thinking about it. as the wikipedia article says, they receive higher rewards for doing things, which tells me that the emotional decision making center is more active, which is why 'J' people are often thought to be much more goal oriented, as they are seeking that dopamine reward for getting things done. Te and Fe are simply two different ways of emotional decision making.
i suppose this brings me to why i want to know the neurological functions of perceiving. my hypothesis (i hesitate to call it a theory) is that the Ne brain has more
executive function connections in the brain that connect to the parts that hold and create ideas, while Si is perhaps more well connected to memory (particularly emotional memory) areas. Ni is perhaps connected to memories in a different way. i've read before that Ni is often responsible for epiphany's, which leads me to believe that it has some connection to information already in the brain and has a way of putting it together 'behind the scenes'. Se executive functions could be connected to the process of compiling and sorting through sensory information.
thats all purely speculative, of course, which is why i'm interested in other peoples theories about the neurological functions of our perceiving functions (Ne, Ni, Se, Si).
