Let's do a fun example of the perception functions.
Say there is an object covered with a blanket concealing any revealing information about the object. (I have another one of these analogies on another thread with a swimming pool).
Se: Based on the shape of the object protruding through the blanket, I can estimate that it is probably [insert item]. (Objective awareness, looking directly at the facts, what's in front of you, and attempting to reason situations through objective sensory data)
Si: I've seen [insert item]s that possess about the same shape before, and it looks exactly the same as the shape of the object I remember; therefore, I think it is [insert]. (Subjective awareness, remembering and realizing exactly what sensory details mean to you but not to others and using that conclusion to solve situations in the future)
Ne: Hmmm, I could take a guess by the shape of the objects but there is simply so many things that could be under that blanket, for all we know, it could be several objects together to make it look like another object. (Objective Abstraction, seeing all of the possible angles to a situation)
Ni: It's a

[insert item]; don't ask me how I know, because I can't tell you, I just know that it is [insert item] and I have no idea why I think this, it just seems like it is. (Subjective Abstraction, looking beneath the exterior without actually looking beneath it, being tuned in to patterns that seem distant from reality)
Introverted intuition is being able to figure out abstract patterns behind reality based on instinct and interpret what those abstract patterns are in relevance to you to be utilized via a Je function.