 Thus, while preservative forms of content variantism imply that genuine memories are always authentic, such memories are not always true. Authenticity implies truth only where the subject’s original experience itself was accurate with respect to the experienced event. Cases of misperception, again, illustrate the possibility of authenticity without truth. Preservationists who wish to hold that genuine memories are always true must therefore impose this as an additional requirement, above and beyond what is required by the core of their theory. By the same token, while generative forms of content variantism allow that genuine memories are sometimes inauthentic, such memories are not always false. Inauthenticity implies falsity only where the subject’s original experience was both accurate and complete. Cases of boundary extension (discussed above) or field-observer perspective switching (Debus 2007b; McCarroll 2017; Sutton 2010b) illustrate the possibility of inauthenticity without falsity. In cases of perspective switching, the subject perceives an event from one perspective (field perspective) but remembers it from another, perhaps even seeing himself in the scene (observer perspective); while many or most observer memories are inauthentic (since they fail to correspond to the subject’s original experience), they are not necessarily false (since they may correspond to what an observer would have seen). For these reasons, generationists do not hold that genuine memories are always authentic. But those who wish to hold that genuine memories are always true can impose this as an additional requirement