The Importance of Memory in Personal Identity

John Locke asked the following simple question. Suppose you woke up one morning and looked into the mirror and saw not your face but someone else's. It seems to me there is something going on there which is right that bodily continuity has to be an aspect of person's identity. But John Locke didn't put so much weight on the body. Indeed, in fact, when we ask ourselves how our human being is not like a pile of pebbles, we end up thinking as Locke thought, a human being is centrally a psychological subject.