The instruction to notice what is happening sounds like it should require no skill at all. In practice most mental activity proceeds without any accompanying awareness that it is occurring, and closing that gap is the actual work.
Awareness is not automatic accompaniment
Thinking, judging, planning and remembering happen continuously, and almost none of it comes with a simultaneous registration that it is happening.
A person absorbed in a train of thought is not aware of thinking; they are aware of the content, with the process itself invisible from inside.
Noticing therefore requires a second thing to occur alongside the first, and that additional layer is what has to be established through repetition.
The moment of return is the only trainable point
You cannot notice that attention has wandered while it is wandering, because the noticing is what ends the wandering.
The event available to practice is the transition itself, the moment of recognising that attention has been elsewhere, and that moment can become more frequent with repetition.
Sessions that feel like continuous distraction contain many of these transitions, which is why they are better practice than they feel like at the time.
Distraction is not experienced as distraction
While attention is captured, the captured state feels like the natural and complete situation, with no sense of anything missing.
Thoughts are experienced from inside as reports on reality rather than as events, which is precisely why they can absorb attention so completely.
Recognising a thought as a thought rather than as an accurate description of the situation is a substantial shift, and it is what the practice is aiming at.
Naming supports the registration
Many instructions include a light label — planning, remembering, hearing — applied to whatever was found when attention returned.
The label creates a small gap between the experience and the person having it, which makes the event easier to register as an event rather than as reality.
The labels are deliberately coarse, because refining them turns into an absorbing analytical task and reproduces the problem the practice is addressing.
Why the capacity matters outside practice
Reactions run through the same automatic route: the response is underway before there is any awareness that a response is being made.
What practitioners report changing is not the absence of reactions but their arriving with a small margin in which something else becomes possible.
That margin is the whole practical claim of the practice, and it is considerably more modest and more useful than the states usually advertised alongside it.