It's only when you're told that you're going to be working on this problem, and then you start procrastinating, but the task is still active in the back of your mind, that you start to incubate.
Es solo al saber que vas a trabajar en este problema, y luego uno empieza a procrastinar, pero la tarea sigue siendo activa en la parte posterior de su mente, se empieza a incubar.