The default mode network is involved in self-referential processing, which means thinking about ourselves. When we're worried about what somebody's thinking about us or we're ruminating or we're planning in the future, we're most likely to be activating this network of brain regions. We can simply rest and being aware; Excitement on the other hand requires something to happen to us or requires us to procure something that we want. But if I can get out of that into the curious, what is my experience like? It changes everything. Absolutely.