And that's why it's so hard to concentrate sometimes, one memory leads to others and it's almost satiating, forgetting the original thought altogether.
That is why we have such techniques like iam and kriya lt is very difficult to practice them with out rotating energy up and down the spine and maintaining focus in doing it.
However here u are talking about concentration SI. I was referring to the ability to for instance remember a song, the words to it and perhaps the name of it when u just remember the melody. This is just an example but it could apply to many things we do not recall but have vague recollections of them. It is an interesting subject to me: This idea of recollection and memory.