i have noticed that people on these forums(and in mbti function descriptions) put way too much weight on Si's recalling the past factor and leave out the fundamentals of Si(as jung described it) out completely. so i decided that i should clarify Si to you guys.
first of all, even tho Si is totally dependent on object and objective stimuli, its still very much a subjective perception. would be fair to say that its a totally subjective perception of objective stimuli.
jung used nice example about this in his book; "If, for instance, several painters were to paint the same landscape, each trying to reproduce it faithfully, each painting will be different from others, not merely of differences in ability, but chiefly because of different ways of seeing; indeed, in some of the paintings there will be a distinct psychic difference in mood and the treatment of color and form".
now ofc the same thing happens with all types, but Si is ruled by this sort of subjective perception of objective stimuli.
naturally the subjective perception can be totally in line with the objective stimuli. that doesent happen because the Si user is perceiving the objective stimuli as it is, but because the objective stimuli happens to match with the subjective impression of the stimuli.
now when it comes to recalling past events and comparing it to past moment. its not the objective factors that Si is comparing the events to, its the subjective perception/impressions of the past event that Si compares the subjective perception/impression of the current even to. so its not about comparing to what happened to whats happening in its pure form, its the subjective perceptions/impressions that are being compared.
while Se is being guided by the intensity of the objective stimuli, Si is guided by the intensity of the subjective impressions of the objective stimuli, not the intensity of the objective stimuli.
feel free to use this on that type wiki thing