Is it necessarily a reference to the past? A remembrance of past details, numbers, experiences?
Don't we all do this to some degree? Or is Si only Si when it is coupled with other functions, thus Fi doms will evoke "feelings from past encounters" or Ti doms will "dissect and analyze the past".
This makes me think that, because functions are only distinguishable when they go hand in hand, that the precise definitions for each are flawed.
It seems like Si is one of the more ambiguous functions...