is now when your brain processes the signals from the surroundings or when the signals actually take place
Discussion
It is not so clear to me. Everything we perceive comes from the past, sound is not instantaneous, neither is light (although very fast π€£).
We really 'feel' the past.
the point of processing those signals makes the most sense to me, if you were to put something in the middle of an axis from a person's point of view
also agree with your last sentence