The "sediment" of a deeply traumatic experience can take a lifetime to dissolve ... or it might never fully dissolve. Which means that it is present -- if unconsciously -- all that time.
No question about it. I was talking about the result of purification. If you remove the ignorance, then it will dissolve with time.
This sounds like living in pure nonjudgmental awareness, letting "what is" simply be. And, yes, in this state you are not thrown hither and thither by knots. But these knots still exist, still arise. They just flow unimpeded "in one ear and out the other." I'm talking about unravelling the knots, which is, I think, quite different.
In pure nonjudgmental awareness, those knows dissolve at arising. And because of relearning process, they are weakened until gone.
Unraveling knots can happen simply through being mindful of you emotions. Actually, most of thoughts that arise is triggered by a emotion caused by a knot. If you can notice it, you can "shift back the tape" and look for the cause of a thought or feeling. You can also try to analyse your present mind state, or directly take care of those knots you are aware of. By going to the roots, it may appear that the knot is inconsistent, based on misunderstanding of the past event which you can now correct. This way you can catch only those big fishes, or spend few lifetimes to catch them all.
Again, I'm inquiring into whether meditation/mindfulness can wipe it from the brain entirely, for good.
Once more, yes it can wipe it entirely. It is done through knowing the empty nature of those knots (and not only). For the whole life you were afraid of a snakes at night. Through shedding some light at the spot it appeared that it was only a shadow. In the same way, you can wipe out the knots. Knots are based on presumption that we know something to be true. In the moment you see that your conclusions were wrong, knots are removed. Good example is a knot made of view. We hold onto it, thinking it's true. But when we are proven wrong, we let go of that view. Now, codependent existence of everything in the universe, proves that we are always missing truth, because to fully know one thing we would have to know everything. Because it is impossible, we agreed upon simplifications. In our world truth is just an agreement. Socrates was not a stupid guy by saying "I know that I know nothing". If you know nothing, the "true base" of every knot is questioned, and dissolves having no true justification.
Say what you think about me here.