 As was mentioned in  §1.2,  Locke characterises a person as “a thinking intelligent Being, that has reason and reflection, and can consider it self as it self, the same thinking thing in different times and places” (1700: II.xxvii.9). On such a view, self-consciousness is essential to personhood. In particular, on Locke’s view it is the capacity to reidentify oneself at different times that is important, a claim which is in keeping with the central role of memory in his account of personal identity (see Ayers 1991: vol. II, chs. 22–25; Thiel 2011: ch. 4; Weinberg 2011; G. Strawson 2011b; Snowdon 2014: ch. 3; entry on  personal identity).  As such, Locke considers the capacity for self-conscious thinking to be a necessary condition of personhood. What is less clear is whether, on this view, self-consciousness is sufficient for personhood. One reason for doubt on this score is that since it is concerned with self-conscious thought the account provides no reason to suppose that creatures that enjoy non-conceptual self-consciousness are persons. A second is that the requirement of being able to reidentify oneself over time is not one that we need consider met by all self-conscious creatures for, we can suppose, it is possible for a self-conscious subject to lack the conceptual sophistication to understand the past and future tense.