 It is important to note that there is no guarantee of any correspondence between first-person and third-person memory markers. Many factors which might plausibly be held to shape the rememberer’s subjective judgements about whether he is remembering or merely imagining—such as the vividness of an apparent memory—are such that they do not track the objective boundary between memory and imagination. And many factors which might plausibly be held to track that boundary—such as the existence of a causal connection between an apparent memory of an event and the subject’s original experience of it—are such that they are inaccessible to the rememberer and therefore ineligible to serve as first-person markers. Criticisms of proposed memory markers that disregard the distinction between first-person and third-person markers may miss their target. Bernecker (2008), for example, objects to the source monitoring framework in psychology (Johnson (1997); see below), along with similar earlier approaches in philosophy (Smith 2013), on the ground that the markers identified by the framework discriminate between memory and imagination only imperfectly. If these approaches are understood as pertaining to third-person markers, then Bernecker’s criticism is telling. If, however, they are understood as pertaining to first-person markers, then it is not: since subjects’ judgements about whether they are remembering or imagining are sometimes mistaken, an account of first-person memory markers should not identify markers that discriminate perfectly between memory and imagination.