Originally Posted by Pietro
I'm not sure how new you are to GTD, but the thoughts may be lingering after they have been captured because you have not fully developed the habit of revisiting them during weekly review. The key in GTD is to capture intentions to act in a trusted system. You may not have demonstrated to yourself that the system is trustworthy. The cure for this is to keep working the system until you fully trust that intentions placed into it will not be lost.
If that is not the case, then I would suggest you try these other strategies in the order indicated.
1. When the captured thought re-intrudes, then mentally note it, release it, and return your attention to what you were doing. Try it repeatedly before trying anything else.
2. Do a "pattern break" by getting up from where you are and performing an active task of some kind. This could be a short walk, getting something you need from the supply closet, or whatever. The important points are that you are physically active, and that you physically remove yourself from the place where you are having the thought.
3. Take some time to think the thought intensely. Think it through and articulate it fully in writing. (You don't need to create a finished document. Mind mapping or speed writing would work perfectly well.) Anything you produce may be saved as project material or discarded at your option.
Hope these help.