Abstract

Hylomorphism provides an explanation of material composition: the material parts, the Xs, will compose a whole, a Y, belonging to a given natural kind, when those parts are characterized by a substantial form. While there are a number of those who hold that each human person is identical with a human animal – ‘animalists’ – most of these are not hylomorphists. One could worry that hylomorphism contributes little unique to debates about personal identity, collapsing into either a form of property dualism or substance dualism. What I aim to do is apply a robust and classical hylomorphic account of persons (derived from Thomas Aquinas) to two contemporary problems, illustrating the way in which hylomorphic metaphysics can offer elegant solutions to tricky situations posed against animalists. Specifically, I will propose that hylomorphic animalism can help provide principled resolutions to worries that seem to undermine animalist intuitions which are raised by ‘brain transplant’ or ‘remnant person’ scenarios. Hylomorphism can capture the advantages of ‘hybrid’ animalist responses without the cost of denying a singular, biological criterion of personal identity. Further, hylomorphism provides a distinctive upshot for Christian theologians and the moral positions that they want to affirm by rendering morally anodyne apparent epistemic difficulties in identifying personal identity over time.