I'm not saying they give evidence of persistent selfhood. If anything they provide the individual with a sense of self that can at best only be assumed - and Occam would sort out the rest. But Occam indicates rationality, not proof. i.e. memories enable us to conclude rationally that we are the same person - that our own "I" persists. Whether our own self persists - we have to define clearly what we mean/refer to by "self" as there's possibly some fuzziness about what is being considered. Sure, personality, the way we operate and store our memories etc might change - i.e. what I would see as the clothes our "self" wears. But throughout there is still the sense of "I" or "self".