  This reply, however, seems to overlook the original motivation,  which was to find a somewhat closer relation between identity and our practical concerns than this. While biological continuity may  track the patterns of ethical concerns, it doesn't provide any real  explanation for them. It may be rational for me to  anticipate only the experiences of my biological continuers, for  instance, but it won't be in virtue of my biological  continuity with them that it's rational to do so; rather, it seems  rational only in virtue of the psychological relations they are  expected to bear to me. And so one might be tempted to reject the  Biological Criterion of identity because of this poor explanatory fit with our practical concerns.