As we have seen before, the Observer is the observer of both Experience and the Experiencer. In outer life, experience usually arises from interaction with the world through the senses. In the inner life, which is the particular focus of meditation, experience arises from stored impressions, what we call samsakaras. And the experiencer interacts with experience whether coming from outside, or as in meditation from those stored impressions.
Taking as usual our focus on the inner life, and therefore in meditation, and accepting that the experiencer is likely to react to any impression that arises, let us look more closely at the nature of experience. In instruction in meditation we do not usually find the instruction 'observe, be aware of, your experience'. Usually instruction is, 'become aware of your thoughts'. And it must have occurred to everyone at some stage, well what is thought then. And you might even have found yourself thinking when something outside of what you take to be thought arises, I should be being aware of my thoughts, not this.