Abstract

Scholastic philosophers in the thirteenth and fourteenth centuries advanced original and sophisticated accounts of the nature of cognition and mental representation. This dissertation analyzes some of the debates of that period, beginning with Thomas Aquinas and going on to consider a number of his most penetrating critics: Henry of Ghent , Peter John Olivi , William Ockham , and William Crathorn . The study begins with some of the theoretical foundations of scholastic theories of cognition, such as the nature of cognition, the link between cognition and immateriality, and the sense in which mental representation rests on a similarity between our ideas and the external world. Debate over these issues led later scholastics to give increasing attention to epistemology and the threat of skepticism. Henry of Ghent's epistemological focus led him to formulate an interesting and original argument for the Augustinian theory of divine illumination. Other scholastics--in particular Olivi and Ockham--were similarly concerned that the standard Aristotelian theory of cognition, as formulated by Aquinas, would lead to skepticism. Their response was to reject a central feature of Aquinas's account: that our knowledge of the external world is mediated by internal impressions . Olivi and Ockham eliminate such intermediaries entirely. For them our knowledge of the external world is throughly direct, and they reject the distinction, which I argue is central to Aquinas's account, between acts of cognition and internal objects for those acts. I conclude that the work of Olivi and Ockham is significant primarily because it challenges the picture of mind that comes so naturally to us: that the mind is a repository of images and ideas that are the inner objects of our perceptions and thoughts. ;The dissertation's second volume contains translations of the central texts