Thanks first of all for giving a very nice answer, one that i was expecting for a while now ( no offense to the others on this site )
so let me get this straight... Ni functions by coming up with conclusions based on the patterns it notices during life and believing them and/or acting on them, whether they make sense logically or not is not important to Ni.
So my dad may have noticed that people who wanted to have nice cars didnt get them until their later years. So my dad noticed this pattern and came up with his story ... but if that is true then it doesn't seem to me as though Ni is difficult in explaining, what i mean is ... my dad could have just said that he noticed a pattern, but me being a Dominant thinker would have said that it may or may not be true but my dad because he is intuitive would still believe what he believed because it seems too true to ignore? ( his intuition is strongly suggesting that it is true )
First thing to note is that Ni does not draw conclusions, it simply provides information, drawing conclusions is the job of his Fe and/or Ti. And no, it is not neccesarily something as litteral as "He saw it happen before", you are confusing it with your own worldview (Si). A Pattern can occur in more ways than simply the same thing happening twice, Ni could apply a pattern in something that has absolutely nothing to do with an old man and his car, which is why it seems like it can be contradictory and paradoxical. What you saw happen contained two things, literal information (A symbol if you will) and interpretive information.
Logic is not important to Ni for the same reason it is not important to Si. When you see something happen, it does not matter if you don't understand how it happened, you can still be certain that it did indeed happen. Well Ni is similar.
The only difference is that it notes how certain patterns work in the world and then when it sees these patterns occur again (Not necessarily by repeating the exact same event), they can be certain that they are seeing the same pattern they saw before and can interpret it.
The literal information was: The old man is driving a Ferrari
The Interpretive information was: The old man in the Ferrari's is symbolic of a natural pattern of the elderly wanting to feel young again by engaging in various activities.
Don't try to understand exactly what your dad was thinking and seeing, because you have no idea how he came to that conclusion, maybe it was simple, maybe it was complex, who knows. Either way, Ni is not something easy to explain to people, and they sometimes avoid it because they are not confident that they will give their explanation any justice, especially if their Ti is not very well developed.
You would not jump to such a conclusion simply because you are a dominant thinker, it is because 1.) Your Ne is higher than your Si, and 2.) Your Si is not one of your comfortable functions, so you don't have as much confidence in making such an absolute statement (but that does not mean we are incapable of it, we do it all of the time in many other contexts.) You might see Si dominants or Si Auxiliaries make similar statements. Actually, you might also see INTPs with very well developed Si make similar statements.
if that is all true then the question is whether or not intuition is an acceptable way in making decisions giving the idea that it may be wrong..
and if it is possible could it be developed in a way somehow to become more right then wrong in its judgments. ( I believe this is possible, but the question is how )
Again, Ni does not make decisions, but if you are asking if it is an acceptable source to base decisions off of, then my answer is "Hell yes."
Everything could be wrong, even empirical evidence can be wrong if it is not being interpreted correctly. Since you are an INTP, you are looking at this from the perspective that you hold: we should be afraid that we are not right. An Ni dominant is going to be the most confident and comfortable with their Ni, so that fear of being wrong is probably not really something that they are going to have. However, we are actually not so different.
An INTP will analyze information and take in as many observations and principals as possible. What this does is expand our Si worldview of how something works until we are comfortable with drawing a conclusion on it. Well consider this: what if you are already familiar with exactly how something works (Ie: it already exists in your Si worldview), are you going to feel like you need to spend time analyzing it all over again, or are you just going to draw a quick conclusion?
Well this is similar to the perspective of the Ni dominant, they already have an idea of what is happening.
True, they have potential for error, but they also have the potential to see things that are light years beyond anyone else in that Ni of theirs. Being confident in their worldview is not something that makes them weaker. However, it is most optimal when they develop their Fe, Ti and their Se, which allows them to see a much more realistic picture in their Ni, and then make logical and practical sense of it.
OK. you also made a kind of comparison between Si and Ni.
So from what i can understand Ni is having to deal with patterns that it notices and the person that notices them gets a kind of impression from them relating to the past and future
Si is remembering experiences based on the 5 senses and using them as a reference.
I think im starting to get it, but Si and Ni seem similar in a way. Any ideas on how they are and aren't?
from the picture im starting to draw here....
Si is a collection of remembered history of experiences ( 5 senses )
Ni is a collection of remembered history of patterns ( 6th sense )
am i right here?
Don't relate Si to the senses because that will mess with your understanding.
MBTI kind of screwed up by calling it "Sensing" because both of the sensing functions (Se and Si) are perceptions that take in literal information, which does include the 5 senses, but it is not exclusive to it.
To put it simply, Si is a recall of literal information that was collected in the past, either by the senses, your information you read and thought about, etc.
Ni is a future oriented worldview model based on patterns and abstractions of the universal truths of natural law.
For more information, check out the Ni section of my thread:
http://www.intpforum.com/showthread.php?t=6582