Neil Messer brings together a range of theoretical and practical questions raised by current research on the human brain: questions about both the `ethics of neuroscience' and the `neuroscience of ethics'. While some of these are familiar to theologians, others have been more or less ignored hitherto, and the field of neuroethics as a whole has received little theological attention. Drawing on both theological ethics and the science-and-theology field, Messer discusses cognitive-scientific and neuroscientific studies of religion, arguing that they do not give grounds to dismiss theological perspectives on the human self. He examines a representative range of topics across the whole field of neuroethics, including consciousness, the self and the value of human life; the neuroscience of morality; determinism, freewill and moral responsibility; and the ethics of cognitive enhancement.