Assume that you are using priming as a technique to improve your performance in a specific area. Ex: When I am sleepy in the morning I use more alert music to get my mind up to speed. If I want to stay focused I try to visualize a focused person or I try to focus on an object for a few minutes. With these I am trying to used the ideomotor link (as Khaneman calls it) and to increase the concentration power directly or indirectly.
Now let's assume that I want to go back and get out of being focused and staying alert and I expose myself to stimuli that would send me in the opposite direction. Would the initial priming be an obstacle in this direction?
Note: in Kahneman's example imagining yourself smiling will actually improve your mood. Same way, imagining yourself concentrating on something should improve your focus.