Well, one reason why ENTP's talk so much is because when an idea occurs to me from within (which might be Ni), I just HAVE to throw it out to 'the panel' (the world in general), to bounce it off things and see what it hits and what comes of it, so my Ne can then feast on the results. Then again it might not be Ni, because often it's something someone just said or something I looked at that made me suddenly think "Wow, what if...?" and again, I have to throw the thought outward, to watch it bounce like a game of pinball. Or if you like, kinda like I'm playing football, and I'm like the referee and the balls are ideas, I can just sit there and hold onto them, or I can plant it on the ground and let the teams kick it about and DO something with it. I've GOT to put it out on the line, I HAVE to see what will be made of it.
This someties causes friction for ENxP's because when we see someone else expressing an idea we assume they're doing the same thing, and start kicking it about, only belatedly realising that they just wanted to sit and hug the 'ball', or have everyone say what a nice ball it is LOL
I like to put things out into the field to test them, so to speak, to sorta plough, sow, grow and reap in super fast motion. My first instinct with anything is to throw it out and see what springs up; to bounce it and see what comes back. I think maybe Ni's first instinct is to turn it inward, mull it over within yourself and see what you can make of it.
I just basically exist in a state of constant data gathering without even knowing it or doing it consciously most of the time. If I ever make a movement or say a word, it's usually been decided on after having considered dozens of external factors in a split second that I was only barely aware that I took in, but I did take them in, completely. I kinda think that's why all the best drivers I've known have been ENxP - having to concentrate on so much at once and just react instinctively to it all at high speeds, it's kinda what we're born to do.
In a way we're doing the same thing - you're juggling lots of variables in your mind as you make your decisions. We're both doing it, but whilst you're doing it with what you already know, I'm doing it with stuff that's coming in right now, and what
will come in, in a second, a minute, an hour or a year's time. I've learned as I've got older that I have to sometimes slow myself down and let Ti apply the brakes a little bit, because otherwise I forget to reference info that's currently coming in with stuff I already know, to reference it with prior experience, and I fail to take something into account because nothing in the external environment 'triggered' me into remembering it, or gave me the cue to 'use' it.
EDIT
Nightning said:
Whereas Ni for me likes creating models. Using the boat example, Ne floats in its little boat and goes wherever thoughts take it. Ni is a boat with an anchor... tied by a stretchy cord but nonetheless tied down to one idea.
Yes, this has been the main bone of contention that's caused friction between me and INxJ's all my life and especially when I've worked with them. It's quite simple - they're fixated on the idea and what they think it is/should be, based on the presumption that they alone must do it out of the materials they already have and their own ingenuity, but whilst I'm similarly enthralled by the idea, I'm more fixated on what it
could be - and I refuse to accept that there isn't more equipment 'out there' that I could use to make this model, or that I can't somehow get my hands on it.
Imagine the INxJ is sitting at a Lego table with a pile of bricks, wanting to make a lighthouse, but all the bricks are one shape and the lighthouse needs to be round. I immediately accept that a round shape can't be built with those bricks, so I go out in search of other kinds of bricks, while the INxJ sits doggedly trying to make a round tower out of rectangular bricks - it might be done if there were enough of them, but there aren't and I recognise that and accept it. I come back, pile a load of differently shaped bricks on the table and say, now we can get started. The INxJ gets mad and says while they've been working hard on the project I've just been wandering around aimlessly, and curses at me for all the 'mess' I've just made on the table. Eventually I calm them down by saying 'Just STFU and watch' and showing them how some of the bricks I've found can combine with the ones already there to make a perfectly round tower.
Now if it's INFJ, they usually think that I think they're stupid, take it personally, accuse me of taking over the project and all kinds of other weird stuff. If they're INTJ, they pretend not to be impressed with what I did and say it could've been better, and insist that it could still have been done their way.
I think that somewhere in this common interaction between those of us with dominant Ne and Ni, lies the key to the difference between the functions.
I'm sure you've had similar experiences - I'd love to hear how they come across from your point of view - probably quite different to how I see it!