Simon Beck

There are two currently popular but quite different ways of answering the question of what constitutes personal identity: the one is usually called the psychological continuity theory (or Psychological View) and the other the narrative theory.1 Despite their differences, they do both claim to be providing an account—the correct account—of what makes someone the same person over time. Marya Schechtman has presented an important argument in this journal (Schechtman 2005) for a version of the narrative view (the ‘Self-Understanding View’) over the psychological one, an argument which has received an overwhelmingly positive response from commentators (Gillett 2005; Heinemaa 2005; Phillips 2006). I wish to argue that..

In his New Essays on Human Understanding, Leibniz presents a sharp attack on Locke's theory of personal identity, Matching Locke's thought-experiments with those of his own, Leibniz seeks to show that our identity cannot rest on matters of consciousness alone-being the same person is rather a matter of the continued existence of an immaterial substance. I draw attention to some contemporary thinkers who-while eschewing the immaterial substances-are sympathetic to the kind of argument Leibniz offered. This leads to a dilemma: on the face of things. we cannot be sympathetic to both Leibniz and Locke. I investigate a theory which would resolve this dilemma-giving up something which each held dear, but not everything, The resultant theory leans unpopularly more towards the side of Leibniz than Locke but can point to the authority of no less than David Wiggins. In the end, though, I argue that there is another solution to the dilemma - a solution which claims that Leibniz and Locke are arguing at cross-purposes, and that their arguments are best seen as answers to different questions. This solution still requires the giving-up of widely-held beliefs but involves significantly less cost than the alternatives.

The thought-experiment presented by Bernard Williams in 'The self and the future' continues to draw the attention of writers in the debate about personal identity. While few of them agree on what implications it has for the debate, almost all agree that those implications are significant ones. Some have even claimed that it has consequences not only for personal identity, but also concerning the viability of thought-experiment as a method. This paper surveys what these consequences might be at both levels - as a substantive contribution to the debate on identity, and as to what it shows about the usefulness of thought-experiments. It argues ultimately that thought-experiments like Williams's do provide a useful philosophical tool as long as we temper our expectations of them, and that it offers some support to a view of personal identity but one which is at odds with Williams's own view.