It should be noted that Ne and Si are the two sides of the same coin and im talking about the coin here, not about one side or another.
And i should give a proper definitions for both S and N.
S is simply defined as perception of what is, a fact.
N is defined as perception via unconscious and seeing where something came from and wher it might be going to/possibility over time. This possibility over time is acquired from comparison between external world and Si(what is inside). These possibilities come in form of instincts, unless the internal counterpart(to the external perception) is seen consciously.
I should also tell you what i mean by object. Object can be other than just physical object, it can be anything you can process, a group of certain people, certain person, certain idea, concept(concrete or abstract) etc.
NeSi is looking for an internal counterpart for external perceptions. This comparison happens more or less unconsciously.
When Ne is preferred over Si, the internal counterpart(memory/internalized fact) is less conscious and the matching comparison results usually on perceiving an instinct or gut feeling about where the perceived object might be going to(its possibility over time). When Si is preferred over Ne, the gut feeling of possibility over time is not perceived as easily, the treshold for seeing the connection between external object and internal counterpart is higher, thus comes to consciousness less often, but when it does, the internal object is seen more clearly. One major difference between the types(np vs sj) is that for sj types clarity of internal counterpart is more of a reguirment for comparison to be taken seriously, while for np types the internal counterpart doesent need to be seen so clearly, since for np the internal counterpart isnt as differentiated(distinguished from others) in the first place, but is more mixed up with others.
This leads to stronger bias towards perceptions(compared to Se users), because external perceptions are modified by 'what is' inside. How this perceptual bias happens reguires bit of explanaining. The perception itself is lacking compared to Se, because S in introverted attitude is removing what is unconsciously seen as irrelevant on the external perception. Ne adds possibility and connection between objects perceived to this partial perception, building an big picture perception with connection between things and possibility over time.
Sj types naturally use their Je function more consciously in order relate to their external world, so even tho they arent adding/seeing possibility of external objects so clearly, it doesent mean that they would relate to external world less consciously, they just do so with judgment more than np types.
I think thats all for now.