Aristotle initiated the systematic investigation of perception, the emotions, memory, desire and action, developing his own account of these phenomena and their interconnection. The aim of this book is to gain a philosophical understanding of his views and to examine how far they withstand critical scrutiny. Aristotle's account, it is argued, constitutes a philosophically live alternative to conventional post-Cartesian thinking about psychological phenomena and their place in a material world. It offers a way to dissolve, rather than solve, the mind-body problem we have inherited.