I know this is not the case with every infp, but I have seen many tendencies to neurotic behaviour and thinking in people who test as infp’s, and I wonder what came first.
Do those people test as infp because they are neurotic, or are infps more inclined to be neurotic?

I can see a tendency that dominant feelers might focus too much on problems, and having a hard time to find solutions because of their inferior thinking. Especially Introverted Feelers tend to have difficulties, as they are not so ready to inform others of their troubles, and therefore are less inclined to gains outside insight into those problems.

However, I have also seen people gain infp-like qualities whenever they are blue, so to say. People familiar with suffering are usually more empathetic then happy people. If your comfort zone has been disturbed, you are likely more contemplative.

So I guess the question is what of our behaviour are our inherent qualities, and what are simply reactions to experience?

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and water are the imperialistic invader that must be fought by all means neccesary.
Drink it.

To answer this little bit: I have both read and observed, that when people are under stress, or meloncholic, some features can invert (p -> j) for instance. And this can result in a verity of behaviors including neurosis, and contemplative moods amongst those that normally don't have them.

Though in all honesty, I have some neuosies of my own, whch display whether I am stressed or not.

As to the actual question, it's rather much harder to answer, peoples behavior develops for all sorts of reasons, and especially early in life, it is rather hard to tell the two apart, as they may be results of native quallities that only express when certain things AREN'T happening in your life. Or they could be non-native traits that desplay as above.

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If only this were fiction ...

I don't know about others, but I've been labeled as bipolar (so much so that I collect disability for it). I've noticed that during times of great stress I will suffer from psychosis. This basically means that I misinterpret everything that I hear, not so much what I see. This happens whether I'm taking medication or not...This results in a childlike world of wonder as everything I see and hear has a different meaning than what other people interpret. For me, I have narrowed it down to a massive shift in reference, in case your wondering, this appears (more a feeling) to be a shift to the left hand side-if that makes any sense. I can't speak for other INFP's or other types (and I'm sure it's not just limited to our type) but I feel that introverted types live in a different world and think differently than other types, therefore I'm led to believe that people of our type are more susceptible to this than other types...Of course, I'm a nutbag-so what do I know. Yes, I am always this candid. Btw neurosis is longer used as a term for a type of mental illness, although when it was, the Dsm 3 stated that neurosis did not involve delusional thinking nor hallucinations, both of which I suffer from from time to time. Sorry for the unrelated ramble.
Edit: Trying to get this badge to work!
http://redeyedjedi1969.mypersonality.info

Might be a 'switching between brain-hemispheres' thing, as the two hemispheres apparently have very different world-views (as a result of evolving to deal with different environmental requirements, so the theory goes).

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Of wet and of wildness? Let them be left,
O let them be left, wildness and wet;
Long live the weeds and the wilderness yet. - Gerard Manley Hopkins

Did you want it as a signature? I can probably flex my admin powers to make that happen.

i don't think its a case of one causing the other so much as both having a common cause in the underlying personality. these tests are just ways of conceptualizing personality, and their constructs are only models. i think the construct "INFP" has a lot of overlap with the construct "neurosis", such that people with certain traits/behaviors tend to score highly on both measures. does that make sense?

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Isn't it pretty to think so?

Keep in mind that you are getting the definition from a group of men based off of an era where anything emotional was considered "neurotic." Being emotional from the 1700's till about the late 1990's was consdiered a big "no-no." This is also the same era where people were straped down in chairs and dunked in ice water to cure "emotionalism."

I feel that the universe is too complex a place to think that having deep feeling is a bad thing. That which is logical is NOT always right and that which is emotional is NOT always wrong.

Now onto your question...

Our experiences do have some basis of how we are shaped but I feel that it is our emotions and not logic nor anything else that defines who we are. In short I think that emotions have far more merit than logic in many ways and make life more interesting.

In short our emotions not our logic mold us and make us who we are. It is how we feel about things that guide us. If anything I think that the world needs more emotion (esp love) rather than logic.