This is a really great defininer between INFP and INFJ. INFJ/INFP seems to be the most common divide that is occured here, and many many people become "stuck" on which side they want to take. As you refrenced this can be caused by dominant tertiary loops. INF's very very often (regardless of if they are INFP or INFJ) tend to show borderline J/P scores on either side. I believe this is largely due to NF idealism. Many INFJ's and INFP's want to be both of these types at the same time. The NF idealism will see that there are great points to either side, and they will convince themselves that they exibit both sides in similar ways, and therefore they can not sort out their type. This likely will sound harsher then it is, but I think this has a parallel to narcissim. While not ill-intended, the INF will want to see themselves as an absolute ideal and will find any reason they can to be both types, and convince themselves of such. This largely has to do with Ni and Fi.



INF's like to pride themselves on understand people, understanding their motivations of people, and being able to "see within" them. INFJ's and INFP's can both be extremely adept at doing this, although they do so in very different ways, and can come to wildly different conclusions. INF's often want to be the best of the best in this remark, and will see parts of Fi and Ni which are good at doing this. I can see a true INFJ seeing signs in Fi in saying "They get that 'uh oh' reaction and get someone intrinsic motivation". They will say that they do that. However if they are true INFJ that is really their Fe speaking through their Ni. Ni will see a pattern to this behavior, and Fe will take the time to consider their interactions with others, and their behavior. If this is Fi speaking, it would be much faster and much "cleaner".



I really do think this is a good definier. However, I am disinclined to say this will sort this out for every INFJ/INFP border-walker out there. This isn't the failure of the author, but the failure of NF idealism. Sorting out ones type takes time, and sometimes some very unpleasent relfection into the bad nature of the individual, and I think that the inferior Te/Se talk does help this.

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