focusing on one main idea- moment to moment you are shifting focus to different "facets" of that idea.
each moment you could perceive many things consciously while recording many more "subconsciously" as well as consciously?
creating memories/ forgetting facts/ recalling emotions/ and all that jazz
i am sure you could focus on no-thing, one thing
not sure how many different ideas you could simultaneously perceive moment b y moment by moment
and i'm also not sure how long "each moment" lasts.
guess you must focus continually for some period of time.
and as with any ability, you could more than likely take this as far as you are willing to go. refer to previous post
just gotta practice, right sleepingwraith/?