I read somewhere that "most children are probably born as SJs, and then alter as they age". This seems to be just another wild hypothesis, but I entertained the thought nonetheless.
Let's say that children are indeed born with a default of 50/50 on the I/E scale, a preference for S, default of 50/50 on T/F scale, and a preference for J. I'll be the first to point out that since the senses and motor skills are developing that babies would obviously seem to be favoring the "S", but that doesn't mean nothing is happening cognitively. Also, some babies (myself included) preferred a schedule for feeding/sleeping and went on a cycle, whereas some do not.
Anyway, let's say that Nature puts them at that preset default level of "personality". Temperament, as some say. This says that everything else must be affected by Nurture, and I would like to know:
As an SJ, how much of your personality do you think was affected externally, and how much of it were you simply born with, due to genetics?
There is a lot of data out there that I am too lazy to compile that suggests that genetics make up about 60% of one's temperament/personality. I tend to agree with that, seeing how the older I get, the more I'm told I have my grandfather's mannerisms. (He is deceased, so I highly doubt that I am doing the unconscious "monkey see, monkey do" thing.)
I will attempt to briefly break down some of the facets of my own personality, in attempt to get my meaning across.
I tend to think that I was born this way. As a child, I was given frequent attention (source: mother) and almost never left alone. However, I am told I would (on an every day basis) play alone in my bedroom for hours on end, building something or working on something (I was a lego maniac). When I learned how to read, I began doing a lot of that, as well.
I personally tend to think that someone's level of I/E is at least 90% genetic. I read an interesting theory that our brains are hard-wired to need a certain amount of external stimulation, and that introverted brains require significantly less and do not like over-stimulation. The opposite applies as well.
I've been studying Piaget's theory of cognitive development and how some people can "get stuck" at concrete operation, or rather, being only able to work with 'reals'. A while ago, I thought I could have been an INTJ, and then more correctly figured out that I'm just using a great deal of Ne.
Now I have an idea that perhaps, rather than using the letters or functions, I'm simply using more of what Piaget called the formal operation, or rather, being able to work with abstracts and imaginary things. The format in which I work with these abstracts would be Ne.
This one, for me at least, is pretty easy to figure out. However, I tend to think that this is mostly Nurture, for me. Both of my parents favor T, and I spend a great deal of time with them. My mom is still emotional, as are most women, but she is significantly less emotional than other women her age, I've noticed. My dad, well, he's just incredibly smart.
Another note I'll add is the Te "putting in order" thing. My mom is the professional neat-freak and has to have everything in its place, and so am I. I hypothesize that I "get this from her". (Both genetically and from observation.)
Preference for using Te is slightly higher on my cognitive functions test score, just above (and just a hair above) the Si score. I would even go as far as to say that I use TeSiNeFi, but I'm an introvert. So....I'm an introvert that is built like an ESTJ then? Who knows.
All I can say is my dad and sister do not share the same inclinations that my mother and I do, as far as order/cleanliness/conventional way of doing things goes.
So, what do you think? Comments, questions, concerns, opinions?