In this chapter, Matthew Ratcliffe addresses the question "what constitutes the sense of being in one kind of intentional state, rather than another?' In other words, in virtue of what do we experience ourselves as currently perceiving that p rather than, for instance, currently imagining that p? Ratcliffe also seeks to show how a productive phenomenological research program can be pursued by engaging with first-person accounts of anomalous experiences, such as those that arise in the context of psychiatric illness. The principal example discussed is "thought insertion': somehow experiencing one's own thoughts as someone else's. The nature of certain so-called "hallucinations' is also considered.