Following an introduction by Margaret Cameron, twelve specially commissioned chapters by an international team of contributors discuss key topics, thinkers and debates, including: mental perception; Avicenna and the intellectual abstraction of intelligibles; Duns Scotus; soul, will, and choice in Islamic and Jewish contexts; perceptual experience; the systematization of the passions; the complexity of the soul and the problem of unity; the phenomenology of immortalitymorality; the self.