The present dissertation concerns cognitive psychology—theories about the nature and mechanism of perception and thought—during the High Middle Ages (1250–1350). Many of the issues at the heart of philosophy of mind today—intentionality, mental representation, the active/passive nature of perception—were also the subject of intense investigation during this period. I provide an analysis of these debates with a special focus on Durand of St.-Pourçain, a contemporary of John Duns Scotus and William of Ockham. Durand was widely recognized as a leading philosopher (...) until the advent of the early modern period, yet his views have been largely neglected in the last century. The aim of my dissertation, then, is to provide a new understanding of Durand’s cognitive psychology and to establish a better picture of developments in cognitive psychology during the period. -/- Most philosophers in the High Middle Ages held, in one form or another, the thesis that most forms of cognition (thought, perception) involve the reception of the form of the object into the mind. Such forms in the mind explain what a given episode of cognition is about, its content. According to what has been called the conformality theory of content, the content of our mental states is fixed by this form in the mind. Durand rejects this thesis, and one of the primary theses that I pursue is that Durand replaces the conformality theory of content with a causal theory of content, according to which the content of our mental states is fixed by its cause. When I think about Felix and not Graycat, this is to be explained not by the fact that I have in my mind the form of Felix and not Graycat, but rather by the fact that Felix and not Graycat caused my thought. -/- This is both a controversial interpretation and, indeed, a controversial theory. It is a controversial interpretation because Durand seems to reject the thesis that objects are the causes of our mental states. In the first half of the present dissertation, I argue that Durand does not reject this thesis but he rejects another nearby thesis: that objects as causes give to us ‘forms’. On Durand’s view, an object causes a mental state even though it does not give to us a new ‘form’. In the second half of the dissertation I defend Durand’s causal theory of content against salient objections to it. (shrink)

This paper argues that three characteristic modern positions concerning intentionality – namely, (1) that intentionality is ‘the mark of the mental’; (2) that intentionality concerns a specific type of objects having intentional inexistence; and (3) that intentionality somehow defies logic – are just three ‘modern myths’ that medieval philosophers, from whom the modern notion supposedly originated, would definitely reject.

"This book does nothing less than to set new standards in combining philosophical with political theology.

This project is guided and motivated by the question concerning the nature of the phantasm as that which mediates between sensation and intellection in John Duns Scotus' account of cognition. Scotus embraces Aristotle's claim that the intellect cannot think without the phantasm. The phantasm is in a corporeal organ, yet the immaterial intellect must act with it to produce an intelligible species. In this project I examine the critical elements of Scotus' cognitive theory in order to understand the nature of (...) the phantasm. In the first chapter I discuss key elements of Aristotle's metaphysics and give a close, textual reading of De Anima guided by his claim that the relationship of the body and soul is highly specific. I then focus on his claim in De Anima 2.12 that sensation involves the reception of the sensible form without the matter. In the second chapter, I discuss Scotus' key theological notions that guide and inform his cognitive project. The beatific vision requires the presence of the divine essence in its own existence to the intellect. As the highest cognitive experience, the beatific vision is definitive of all cognitive experience making the presence of the object to the cognitive faculty of central importance. The discussion of the incarnation shows that the world is sacralized and thus, is a worthy object of cognitive attention in itself. In the third chapter, I discuss Scotus' understanding of the body-soul relationship focusing on his notion of person to both secure the unity of the human being and to ground the mediation between sensation and intellection. In the fourth chapter, I first discuss Aquinas' claim that sensation requires a spiritual change. While Scotus's account is in many respects the same as Aquinas', Scotus does not maintain that sensation is primarily passive and is thus, able to account for cognitive attention by way of his understanding of the unity of the sense organ, immanent actions, and sensation as intuitive cognition. What emerges in this discussion is Scotus' particular understanding of an intentio by which the nature of the phantasm can be understood. (shrink)

In Summa Theologiae I.76.1 Aquinas presents an argument for the hylomorphic union of body and soul that he attributes to Aristotle. Aquinas builds on Aristotle’s original argument, however, offering his own short but powerful line of reasoning in support of one of the main premises. This additional argument involves an appeal to the principle that nothing acts except insofar as it is in act. This principle has roots in the thought of Aristotle, but is not explicitly used by him. It (...) is, however, fundamental for Aquinas and pervasive throughout his work. In this paper I examine the principle and its implications for Aquinas’ version of the argument. Furthermore, I argue that the principle is foundational to Aquinas’ criticisms of Averroes’ account of the intellective soul and that its inclusion renders Aquinas’ version of the argument incompatible with Averroes’ view. (shrink)

Resumen: La “visión escotópica” desarrollada por Aristóteles en De Anima II 7 es la primera formulación sistemática de este fenómeno clave para las actuales neurociencias. En la teoría aristotélica surge una aparente contradicción entre el “compromiso ontológico” de la oscuridad como privación y el “realismo gnoseológico” que considera visible esa misma oscuridad. Tomás de Aquino en su Sententia libri De Anima propone una interpretación que establece la relación analógica entre luz y oscuridad a través del color. Esta estrategia permite disolver (...) cualquier contrariedad y establecer una percepción visual de la oscuridad en sentido realista.: The “scotopic vision” developed by Aristotle in De Anima II 7 is the first systematic formulation of this key phenomenon for current neurosciences. In this theory an apparent contradiction arises between the “ontological commitment” of darkness as deprivation and the “gnoseological realism” that considers that same darkness visible. Tomás de Aquino in his Sententia libri De Anima proposes an interpretation that establishes the analogical relationship between light and darkness through color. This strategy allows to dissolve any annoyance and establish a visual perception of darkness in a realistic. (shrink)