The paper presents a preliminary estimation of the extent of dissemination of optical texts, ideas, and issues among the masters connected with the Prague faculty of arts in the late 14th and early 15th century. Investigation of this topic, so far rather neglected, is based chiefly on manuscript research. The paper brings evidence that perspectiva was taught in Prague at least since the 1370s. It suggests that investigation of Prague quodlibetal disputations (ca. 1390s – 1410s) and consideration of perspectivist authorities (...) employed in these texts can also shed some light on the issue. However, the paper is mainly devoted to the question on the mechanism of vision disputed by Bohemian arts master John of Borotín (Iohannes de Borotin, 1378 – after 1458) in the quodlibet organised by John Hus in 1411. It is suggested that the single extant exemplar of the question (preserved in the codex Prague, National Library, X.H.18) probably is Borotín’s autograph. The structure and sources of the question are analysed, with the conclusion being that Borotín proposes a compromise between intromission and extramission influenced by John Peckham’s Perspectiva communis. A critical edition of Borotín’s question is appended to the paper. / / / Please note this article is published with Brepols Publishers as a Gold Open Access article under a Creative Commons CC 4.0: BY-NC license. The article is also freely available on the website of Brepols Publishers under this same license. (shrink)

The Divine Comedy is a poem of Dante Alighieri representing, allegorically, the journey of a soul towards God, in the framework of Dante’s metaphysics of the divine light. However, besides metaphysics, we can find in the poem several passages concerning the natural phenomena. Here we discuss some them, in order to investigate Dante’s knowledge of Physics and, in particular, of Optics.

This paper investigates how later medieval intellectuals dealt with perspectiva – the medieval discipline of optics, which had seen considerable popularity in Latin Europe since the 13th century and was epitomized in several “books of knowledge” of differing scopes, levels of difficulty and intended audience. This paper is focused narrowly on one of these intellectuals – Reimbotus de Castro (fl. 1350s–1380s), who was not only personal physician to the Roman Emperor Charles IV but was also a diligent (...) copyist and abbreviator of many quadrivial and medical texts, and the owner of several codices now kept in the Bibliotheca Palatina. One of these codices, Pal. lat. 1380, includes two optical treatises copied by Reimbot himself. A closer reading of these texts, hitherto unnoticed by historians of medieval science, provides fresh insight into the reception of optical knowledge in the intellectual milieu of Paris in the 1360s, when Reimbot resided here. The first text is Reimbot’s reportatio of lectures on the famous optical textbook Perspectiva communis by John Peckham; the second is Reimbot’s redaction of the unknown optical compendium Perspectiva cum sit una. Finally, this paper addresses the issue of why optics was interesting at all for people at the intersection of the scholarly and courtly communities like Reimbot (and late medieval scholars generally). It is suggested that medieval optics, being useful for astronomical observations, could be considered a sort of auxiliary discipline for astrology and astrological medicine. (shrink)

Is vision merely a state of the beholder’s sensory organ which can be explained as an immediate effect caused by external sensible objects? Or is it rather a successive process in which the observer actively scanning the surrounding environment plays a major part? These two general attitudes towards visual perception were both developed already by ancient thinkers. The former is embraced by natural philosophers (e.g., atomists and Aristotelians) and is often labelled “intromissionist”, based on their assumption that vision is an (...) outcome of the causal influence exerted by an external object upon a sensory organ receiving an entity from the object. The latter attitude to vision as a successive process is rather linked to the “extramissionist” theories of the proponents of geometrical optics (such as Euclid or Ptolemy) who suggest that an entity – a visual ray – is sent forth from the eyes to the object. The present paper focuses on the contributions to this ancient controversy proposed by some 13th-century Latin thinkers. [...]. (shrink)

"Richard Burthogge's Conceptualism and Its Origins in the Medieval Perspectivist Optics" The paper aims to analyse the historical determinants of the conceptualist argument for epistemological idealism made by the seventeenth-century English philosopher Richard Burthogge. The crux of this argument, unprecedented in earlier philosophy, is an attempt to prove the inherent inadequacy of human cognition from the divergence between the general concepts and the extra-mental singulars. At the same time, Burthogge considers the relationship between the universal and the particular (...) to be analogous to the relation between the visual image and the thing. I argue that, as suggested by certain significant aspects of Burthogge’s theory, it was medieval perspectivist optics that had decisively influenced the conception of visual cognition, which provided the basis for this analogy and, consequently, for the conceptualist argument itself. (shrink)

This paper focuses on Paul of Venice’s realist theory of direct knowledge. In the second half of the 13th century human knowledge was standardly viewed as a process of abstraction enabling the human intellect to grasp the essences of corporeal things, regardless of the matter in which they are embodied. This process was achieved thanks to the mediation of mental entities (species intelligibiles) representing the dematerialised objects in the intellect. By the late 13th and early 14th centuries, however, some authors (...) began to regard this account as unsatisfactory. These authors held that assuming the existence of mediating species (considered themselves as objects of knowledge) amounts to thinking that between ourselves and the world there is a barrier preventing us from acquiring knowledge of reality in itself. Paul of Venice is aware of the sceptical accusations made against the theory of species in the 13th and 14th centuries. Nevertheless, he is a firm advocate of the existence of species. He claims that knowledge, despite coming about through species, is not indirect. Quite the contrary: we have immediate access to reality, and the individual objects that constitute it, precisely because our senses (which are purely passive) receive impressions direct from outside, thanks to species. He points out that species are not object of knowledge. They are not known at all during the cognitive process, as they are a mere means (a mechanical means, so to say), not an image nor a representation of anything, and therefore they are no obstacle between ourselves and the world. Thus, we are able to know reality exactly as it is in itself and, under ordinary conditions, our perceptions are practically infallible and cannot produce false knowledge. (shrink)

The encounter of the medieval Muslims with Greek philosophy undeniably shaped the course of their philosophical and theological thought. This encounter led to the complex and contentious issue of ‘philosophy versus theology’. Medieval Muslim thinkers needed to develop a response to the issue of philosophy versus theology. The present article will first highlight the response of the Islamic theologians to their encounter with Greek philosophy in the form of three major trends in medieval Islamic theology: (1) strong (...) opposition to the application of reason and rationalist approach to Islamic doctrines, and strict adherence to the actual text of the Qur’an and the Hadith, (2) the adoption of Greek philosophy, and the application of reason and rationalist approach to explain and defend Islamic religion and (3) acknowledging the significance of reason in exploring the matters related to the natural world but, at the same time, stressing the subordination of reason to revelation. This article will discuss Atharism, Muʿtazilism and Ashʿarism as the representatives of the first, second and third trends, respectively. The response of the medieval Islamic theologians to the issue of philosophy versus theology serves as a context in which medieval Muslim philosophers carried out their philosophy–theology debate. The article will proceed to show that some medieval Muslim philosophers, such as Abu Bakr Al-Razi, subordinated religion or revelation to philosophy or reason. Other medieval Muslim philosophers, such as Al-Ghazali, subordinated philosophy to theology. The third group of medieval Islamic philosophers represented by Alfarabi argued for the reconciliation and harmonious co-existence of philosophy and religion. Contribution: This article highlights the response of medieval Islamic theologians and philosophers to the issue of philosophy versus theology that was caused by their encounter with Greek philosophy. (shrink)

In this chapter, we examine a few potential problems when inquiring into the ethics of medieval Christian and Islamic mystical traditions: First, there are terminological and methodological worries about defining mysticism and doing comparative philosophy in general. Second, assuming that the Divine represents the highest Good in such traditions, and given the apophaticism on the part of many mystics in both religions, there is a question of whether or not such traditions can provide a coherent theory of value. Finally, (...) the antinomian tendencies and emphasis on passivity of some mystics might lead one to wonder whether their prescriptive exhortations can constitute a coherent theory of right action. We tackle each of these concerns in turn and discuss how they might be addressed, in an attempt to show how medieval mysticism, as a fundamentally practical enterprise, deserves more attention from practical and moral philosophy than it has thus far received. (shrink)

In 1989, Cambridge University Press announced the publication of a new, three-volume book series: The Cambridge Translations of Medieval Philosophical Texts. The first volume – edited by Norman Kretzmann and Eleonore Stump, and dedicated to logic and the philosophy of language – contained 15 medieval texts, of which 15 were composed by Christian authors. The second volume in the series, this time focusing on ethics and political philosophy, appeared in 2000. Seventeen of the 17 texts included in this (...) collection – edited by Arthur S McGrade, John Kilcullen and Matthew Kempshall – were authored by Christian writers. Late-medieval Jewish or Islamic texts on ethics or politics? Not in our school. (shrink)

The 13th-15th centuries were witness to lively and broad-ranging debates about the nature of persons. In this paper, I look at how the uses of ‘person’ in logical/grammatical, legal/political, and theological contexts overlap in the works of 13th-15th century contemplatives in the Latin West, such as Hadewijch, Meister Eckhart, and Catherine of Siena. After explicating the key concepts of individuality, dignity, and rationality, I show how these ideas combine with the contemplative use of first- and second-person perspectives, personification, and introspection (...) to yield a concept of 'person' that both prefigures Locke's classic 17th century definition and deeply influences the development of personalism. (shrink)

Solar power is a very important source of renewable energy for many low power systems. Matching the power consumption level with the supply level can make a great difference in the efficiency of power utilization. MoSe2, crystals (photo-electrodes) have been grown via a direct vapour transport technique. This paper presents results of Photo Voltage (VPh) Vs. Photo current (IPh)curves measured for MoSe2 crystals of different Intensity levels between 10, 20,…100W/cm2 in Polychromatic as well as Monochromatic light. We finding the Open (...) circuit Voltage (VOC), Short circuit current(ISC), fill factor and photo conversion efficiency (?) of Mose2 crystals. The Photo conversion efficiency of this MoSe2 crystals are less than 0.1% in Polychromatic light but nearly 1% in Monochromatic light H. S. Patel | S. P. Shukla | Hitesh Parmar "Optical Response of MoSe2 Crystals" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-1 | Issue-3 , April 2017. (shrink)

In this Ph.D. dissertation, completed at the Sorbonne, it is shown that the whole of medieval philosophy was not reduced to a realist stance: in the 13th-14th centuries, an idealist stance emerged and was developed into a full-fledged epistemological idealism, personified in the philosophers Eckhart von Hochheim and Dietrich von Freiberg. This dissertation deviates from most works in the history of philosophy by proposing to see this as a taxonomy.

Deely's chief orientation, in his Medieval Philosophy field days, was to frame the field's thematic concern in light of the gestation of semiotic awareness. He argued that semiotic awareness was expressed fully for the first time in history by Poinsot, although he said that the process of gestation only resulted in a community-binding Way after the arrival of the Semiotics of Peirce. Between Poinsot and Peirce, a period of darkness preceded a full dawn. In this paper, we provide an (...) introductory picture of Deely's understanding of Medieval Philosophy and strive to convey a preview of the angle adopted by the semiotician. (shrink)

My aim in this paper is to advance our understanding of medieval approaches to consciousness by focusing on a particular but, as it seems to me, representative medieval debate. The debate in question is between William Ockham and Walter Chatton over the existence of what these two thinkers refer to as “reflexive intellective intuitive cognition”. Although framed in the technical terminology of late-medieval cognitive psychology, the basic question at issue between them is this: Does the mind (or (...) “intellect”) cognize its own states via higher-order (or “reflexive”) representational states? Their debate is representative both because it highlights the central dialectical issues and alternatives at play in medieval discussions of consciousness generally and because it showcases the two main types of approach to consciousness one finds in the later medieval period, namely, those that explain consciousness in terms of intentionality (typically, higher-order intentionality), and those that understand consciousness as a non-intentional, sui-generis mode of awareness. (shrink)

During the 13th century, several logicians in the Latin medieval tradition showed a special interest in the nature of impossibility, and in the different kinds or ‘degrees’ of impossibility that could be distinguished. This discussion resulted in an analysis of the modal concept with a fineness of grain unprecedented in earlier modal accounts. Of the several divisions of the term ‘impossible’ that were offered, one became particularly relevant in connection with the debate on ars obligatoria and positio impossibilis: the (...) distinction between ‘intelligible’ and ‘unintelligible’ impossibilities. In this article, I consider some 13th-century tracts on obligations that provide an account of the relation between impossibility and intelligibility and discuss the inferential principles that are permissible when we reason from an impossible – but intelligible – premise. I also explore the way in which the 13th-century reflection on this topic survives, in a revised form, in some early 14th-century accounts of positio, namely, those of William of Ockham, Roger Swineshead and Thomas Bradwardine. (shrink)

Since the first discussion of Brentano’s relation to (and account of) medieval philosophy by Spiegelberg in 1936, a fair amount of studies have been dedicated to the topic. And if those studies focused on some systematic issue at all, the beloved topic of intentionality clearly occupied a hegemonic position in the scholarly landscape . The following pages consider the question from the point of view of ontology, and in a twofold perspective: What did Brentano know about medieval ontology (...) and what kind of access did he have to that material (section 1)? What kind of use did Brentano make of medieval material in his own philosophy, and with what kind of results (section 2)? (shrink)

Nineteenth-century optical toys that showcase illusions of motion such as the phenakistoscope, zoetrope, and praxinoscope, have enjoyed active “afterlives” in the twentieth and twenty-first centuries. Contemporary incarnations of the zoetrope are frequently found in the realms of fine art and advertising, and they are often much larger than their nineteenth-century counterparts. This article argues that modern-day optical toys are able to conjure feelings of wonder and spectacle equivalent to their nineteenth-century antecedents because of their adjustment in scale. Exploring a range (...) of contemporary philosophical toys found in arts, entertainment, and advertising contexts, the article discusses various technical adjustments made to successfully “scale up” optical toys, including the replacement of hand-spun mechanisms with larger sources of motion and the use of various means such as architectural features and stroboscopic lights to replace traditional shutter mechanisms such as the zoetrope’s dark slots. Critical consideration of scale as a central feature of these installations reconfigures the relationship between audience and device. Large-scale adaptations of optical toys revise the traditional conception of the user, who is able to tactilely manipulate and interact with the apparatus, instead positing a viewer who has less control over the illusion’s operation and is instead a captive audience surrounded by the animation. It is primarily through their adaptation of scale that contemporary zoetropes successfully elicit wonder as scientific spectacles from their audiences today. (shrink)

Van Eyck: An Optical RevolutionMuseum of Fine Arts, Ghent, Belgium, 1 February–30 April 2020.

With regard to the new directions in the Humanities, here I am going to consider and examine the approach of al-Farabi as a medieval thinker in introducing a new outlook to “language” in difference with the other views. Thereby, I will explore his challenges in the frame of “philosophical humanism” as a term given by Arkoun (1970) and Kraemer (1984) to the humanism of the Islamic philosophers and their circles, mainly in the tenth and eleventh centuries. Al-Farabi’s conception of (...) philosophical humanism, in which philosophy is thick and religion is thin, makes its agony with the other versions of humanism and also orthodox Islam. It means that his introduction of a humanistic understanding of language should be placed in such a multi-level contested environment. According to al-Farabi, language as a universal category has relation with reason that logic should function as its proper instrument. As a result, there is no specific privileged predetermined language, but the position of any language is shaped by its relation with human reason and formal logic that is something human-made. And such a conception means language in human terms. Key Terms: Al-Farabi; Language; Philosophical Humanism; Arabic: Greek . (shrink)

Medieval authors generally agreed that we have the freedom to choose among alternative possibilities. But most medieval authors also thought that there are situations in which one cannot do otherwise, not even will otherwise. They also thought when willing necessarily, the will remains free. The questions, then, are what grounds the necessity or contingency of the will’s acts, and – since freedom is not defined by the ability to choose – what belongs to the essential character of freedom, (...) the ratio libertatis. This article studies medieval theories of freedom without choice from William of Auxerre to William of Ockham and their background in Augustine, Anselm of Canterbury, and Bernard of Clairvaux. (shrink)

Usually thoughts are not in isolation but in varing degrees have interrelations with each other. With regard to this historical fact as a classist want to explore the reception of a few medieval Arabic texts and writers of Socrates available teachings about politics.

Semantic essentialism holds that any scientific term that appears in a well-confirmed scientific theory has a fixed kernel of meaning. Semantic essentialism cannot make sense of the strategies scientists use to argue for their views. Newton's central optical expression "light ray" suggests a context-sensitive view of scientific language. On different occasions, Newton's expression could refer to different things depending on his particular argumentative goals - a visible beam, an irreducibly smallest section of propagating light, or a traveling particle of light. (...) Essentialist views are too crude to account for the richness and subtleties present in actual episodes of scientific debate and theory-change. (shrink)

A set point in the historical time line stands as the medieval period. The medieval period in history was the era in European history – from around the 5th to the 15th century, coming after the fall of the Western Roman Empire, and preceding the start of the early modern era. This historical time period has been long since been the victim of film directors and romantic novelists, which has lead to the common, but false, idea of the (...) medieval period consisting of knights and damsels in distress, wizards and dragons, and castles and battles. Although mainly wrong in most parts and being highly historically inaccurate – some aspects of the dramatic works do play true to the original time period. Certainly within British/English history we have a huge heritage in the medieval world and so it is quite easy to look for how aspects of this period develop through time but still retain relevance for people today. (shrink)

There are two dominant approaches towards understanding medieval Muslim philosophy: Greek ancestry approach and religiopolitical context approach. In the Greek ancestry approach, medieval Muslim philosophy is interpreted in terms of its relation to classical Greek philosophy, particularly to the philosophy of Plato and Aristotle. The religiopolitical context approach, however, views a thorough understanding of the religious and political situation of that time as the key to the proper understanding of medieval Muslim philosophy. Notwithstanding the immense significance of (...) the two approaches for understanding medieval Muslim philosophy, the question on the reason behind medieval Muslim philosophers’ preference for Plato’s Republic over Aristotle’s Politics in political philosophy is not accurately answered. This preference is usually attributed either to the availability or unavailability of the text or to the suitability or unsuitability of the text for Islamic theological views. However, this article shows that neither the availability or unavailability of text nor its suitability or unsuitability for Islamic religious and theological views can appropriately explain medieval Muslim philosophers’ preference for Plato’s Republic over Aristotle’s Politics in their political thought. This article proposes that the key to understand this preference lies in understanding the transmission of Greek philosophy to medieval Muslim philosophers. Contribution: This study highlights the significance of the thorough understanding of the transmission of Greek philosophy to medieval Muslim world as one of the important approaches towards proper understanding of medieval Muslim philosophy, particularly medieval Muslim political philosophy. (shrink)

Self-knowledge is a persistent—and paradoxical—theme in medieval mysticism, which portrays our ultimate goal as union with the divine. Union with God is often taken to involve a cognitive and/or volitional merging that requires the loss of a sense of self as distinct from the divine. Yet affective mysticism—which emphasizes the passion of the incarnate Christ and portrays physical and emotional mystical experiences as inherently valuable—was in fact the dominant tradition in the later Middle Ages. An examination of both the (...) affective and apophatic traditions demonstrates that, in addition to constituting a necessary stage on the path toward union with the divine, self-knowledge in medieval mysticism was seen not just as something to be transcended, but (particularly in the works of female mystics) as a means of overcoming alienation from embodied existence. (shrink)

The claim that Galileo Galilei transformed the spyglass into an astronomical instrument has never been disputed and is considered a historical fact. However, the question what was the procedure which Galileo followed is moot, for he did not disclose his research method. On the traditional view, Galileo was guided by experience, more precisely, systematized experience, which was current among northern Italian artisans and men of science. In other words, it was a trial-and-error procedure—no theory was involved. A scientific analysis of (...) the optical properties of Galileo’s first improved spyglass shows that his procedure could not have been an informed extension of the traditional optics of spectacles. We argue that most likely Galileo realized that the objective and the eyepiece form a system and proceeded accordingly. (shrink)

This paper highlights the corrective and complementary role that historically informed philosophy can play in contemporary discussions. What it takes for an experience to count as genuinely mystical has been the source of significant controversy; most current philosophical definitions of ‘mystical experience’ exclude embodied, non-unitive states -- but, in so doing, they exclude the majority of reported mystical experiences. I use a re- examination of the full range of reported medieval mystical experiences (both in the apophatic tradition, which excludes (...) or denigrates embodied states, and in the affective tradition, which treats such states as fully mystical) to demonstrate how a better understanding of the historical medieval mystic tradition can serve as a valuable complement to ongoing philosophical discussions of religious and mystical experience. (shrink)

It is discerned what light can bring the recent historical reconstructions of maxwellian optics and electromagnetism unification on the following philosophical/methodological questions. I. Why should one believe that Nature is ultimately simple and that unified theories are more likely to be true? II. What does it mean to say that a theory is unified? III. Why theory unification should be an epistemic virtue? To answer the questions posed genesis and development of Maxwellian electrodynamics are elucidated. It is enunciated that (...) the Maxwellian Revolution is a far more complicated phenomenon than it may be seen in the light of Kuhnian and Lakatosian epistemological models. Correspondingly it is maintained that maxwellian electrodynamics was elaborated in the course of the old pre-maxwellian programmes’ reconciliation: the electrodynamics of Ampére-Weber, the wave theory of Young-Fresnel and Faraday’s programme. To compare the different theoretical schemes springing from the different language games James Maxwell had constructed a peculiar neutral language. Initially it had encompassed the incompressible fluid models; eventually – the vortices ones. The three programmes’ encounter engendered the construction of the hybrid theory at first with an irregular set of theoretical schemes. However, step by step, on revealing and gradual eliminating the contradictions between the programmes involved, the hybrid set is “put into order” (Maxwell’s term). A hierarchy of theoretical schemes starting from ingenious crossbreeds (the displacement current) and up to usual hybrids is set up. After the displacement current construction the interpenetration of the pre-maxwellian programmes begins that marks the commencement of theoretical schemes of optics, electricity and magnetism real unification. Maxwell’s programme surpassed that of Ampére-Weber because it did absorb the ideas of the Ampére-Weber programme, as well as the presuppositions of the programmes of Young-Fresnel and Faraday properly co-ordinating them with each other. But the opposite statement is not true. The Ampére-Weber programme did not assimilate the propositions of the Maxwellian programme. Maxwell’s victory over his rivals became possible because the gist of Maxwell’s unification strategy was formed by Kantian epistemology looked in the light of William Whewell and such representatives of Scottish Enlightenment as Thomas Reid and Sir William Hamilton. Maxwell did put forward as basic synthetic principles the ideas that radically differed from that of Ampére-Weber approach by their open, flexible and contra-ontological, genuinly epistemological, Kantian character. For Maxwell, ether was not the ultimate building block of physical reality, from which all the charges and fields should be constructed. “Action at a distance”, “incompressible fluid”, “molecular vortices”, etc. were contrived analogies for Maxwell, capable only to direct the researcher at the “right” mathematical relations. Key words: J.C. Maxwell, unification of optics and electromagnetism, I. Kant, T. Reid, W. Hamilton . (shrink)

William of Ockham (d. 1347) is well known for his commitment to parsimony and for his so-called ‘razor’ principle. But little is known about attempts among his own contemporaries to deflect his use of the razor. In this paper, I explore one such attempt. In particular, I consider a clever challenge that Ockham’s younger contemporary, Walter Chatton (d. 1343) deploys against the razor. The challenge involves a kind of dilemma for Ockham. Depending on how Ockham responds to this dilemma, his (...) razor will, Chatton argues, either prove unacceptably dull when it comes to determining ontological commitment or prove unacceptably sharp when it comes to determining commitments entailed by certain theological doctrines. While Chatton’s objection is subtle and interesting in its own right, the broader significance of the debate between these thinkers lies in the light it sheds on medieval approaches to issues surrounding metaphysical methodology. (shrink)

Medieval and early modern devotional works rarely receive serious treatment from philosophers, even those working in the subfields of philosophy of religion or the history of ideas. In this article, I examine one medieval devotional work in particular—the Middle High German image- and verse-program, Christus und die minnende Seele (CMS)—and I argue that it can plausibly be viewed as a form of medieval public philosophy, one that both exhibited and encouraged philosophical innovation. I address a few objections (...) to my proposal—namely, that CMS is neither public enough nor that it counts as proper philosophy—and I attempt to defend CMS’s public philosophical credentials in light of these objections. I conclude with a brief discussion of how devotional texts like CMS can help us do innovative public philosophy today. (shrink)

Discussions about singular cognition, and its linguistic counterpart, are by no means exclusive to contemporary philosophy. In fact, a strikingly similar discussion, to which several medieval texts bear witness, took place in the late Middle Ages. The aim of this article is to partly reconstruct this medieval discussion, as it took place in Parisian question-commentaries on Aristotle’s De anima, so as to show the progression from the rejection of singular intellection in Siger of Brabant to the descriptivist positions (...) of John Duns Scotus and John of Jandun, and finally to the singularism of John Buridan. All these authors accept some kind of intellectual access to individuals. Therefore, the conundrum is not whether we have some kind of intellectual knowledge of individuals, but rather whether we can know them singularly. This article begins by presenting the crucial obstacle to singular intellection in Siger. Thereafter, the author shows that Jandun and Scotus depart in fundamental ways from Siger’s account, but that for them the intellection of individuals is of a general character. Finally, she proposes that Buridan is a genuine singularist. (shrink)

This paper surveys medieval Christian philosophy.

This article examines an uncommon materialist argument preserved in late medieval Prague quodlibets by Matthias of Knín (1409) and Prokop of Kladruby (1417). The argument connects the Galenic claim that the human body has the noblest and best-balanced complexion possible with the Alexandrist claim that the human rational soul emerges from such well-balanced matter without any supernatural intervention. Of the various medieval renderings of these claims, John Wyclif’s De compositione hominis is singled out as the most probable source (...) of the argument. Far from attributing plain materialism to Wyclif, the article highlights a semimaterialist position, mentioned in two fifteenth-century De anima commentaries of Prague origin, grafting the immortal spirit postulate onto an Alexandrist-like doctrine of the intellect as educed from the harmoniously complexioned body. Finally, it is argued that this semimaterialist position may not only encapsulate how Bohemian masters read Wyclif, but also be close to Wyclif’s actual anthropological stance. (shrink)

In this article, we reconsider the syntactical analysis as well as the categorial status of two Medieval French elements, et and ne. In this connection, we illustrate and compare various approaches which principally differ with regard to the assignment of a unique category or of various categories to these elements. In the context of this comparison, we address some of the questions pertaining to their motivations and the evidence which has been offered in their favor, showing that approaches which (...) assign a unique category to et and ne, respectively, prove to be empirically more adequate. (shrink)

Recent advances in neuroimaging technologies have rendered multimodal analysis of operators’ cognitive processes in complex task settings and environments increasingly more practical. In this exploratory study, we utilized optical brain imaging and mobile eye tracking technologies to investigate the behavioral and neurophysiological differences among expert and novice operators while they operated a human-machine interface in normal and adverse conditions. In congruence with related work, we observed that experts tended to have lower prefrontal oxygenation and exhibit gaze patterns that are better (...) aligned with the optimal task sequence with shorter fixation durations as compared to novices. These trends reached statistical significance only in the adverse condition where the operators were prompted with an unexpected error message. Comparisons between hemodynamic and gaze measures before and after the error message indicated that experts’ neurophysiological response to the error involved a systematic increase in bilateral dorsolateral prefrontal cortex (dlPFC) activity accompanied with an increase in fixation durations, which suggests a shift in their attentional state, possibly from routine process execution to problem detection and resolution. The novices’ response was not as strong as that of experts, including a slight increase only in the left dlPFC with a decreasing trend in fixation durations, which is indicative of visual search behavior for possible cues to make sense of the unanticipated situation. A linear discriminant analysis model capitalizing on the covariance structure among hemodynamic and eye movement measures could distinguish experts from novices with 91% accuracy. Despite the small sample size, the performance of the linear discriminant analysis combining eye fixation and dorsolateral oxygenation measures before and after an unexpected event suggests that multimodal approaches may be fruitful for distinguishing novice and expert performance in similar neuroergonomic applications in the field. (shrink)

Devices based on organic materials can be mechanically flexible to a large extent because of the loose intermolecular bonds in the nano-electrons created from them. Unlike these organic materials, minerals such as silicon, germanium, and gallium arsenide can be used in the structure of electronic devices only in crystalline states, and in this case, covalent bonds make flexibility impossible in them. Makes. Properties such as strength, flexibility, electrical conductivity, magnetic properties, color, reactivity, etc. Starting to change the properties of the (...) material by shrinking it depends more than anything on the type of material and the desired property. For example, by reducing the dimensions of a material, generally some mechanical properties of the material such as strength are improved. This increase in strength does not happen only in the range of a few nanometers, and the strength of materials of several tens and even hundreds of nanometers may be much higher than the large-scale mass material. On the other hand, the change of some properties such as color and magnetic properties may occur in dimensions of only a few nanometers. (shrink)

Aquinas, Ockham, and Burdan all claim that a person can be numerically identical over time, despite changes in size, shape, and color. How can we reconcile this with the Indiscernibility of Identicals, the principle that numerical identity implies indiscernibility across time? Almost all contemporary metaphysicians regard the Indiscernibility of Identicals as axiomatic. But I will argue that Aquinas, Ockham, and Burdan would reject it, perhaps in favor of a principle restricted to indiscernibility at a time.

In our initial paper discussing plausible steps toward workable warp drive machines. The following article express our view on this debate. While there are still objections toward existing warp drive proposals, such as by G. Landis, Harold White etc., because they are all based on GTR, nonetheless we think it is possible by starting to see if it is possible to deviate from Newton's third law. And we discuss possible a propulsion method based on negative masses, and discuss how optical (...) diameter drive can be first step for realistic lab-scale version of negative mass propulsion. (shrink)

The present volume brings together work that will be of interest both to specialists in medieval philosophy and to those working in contemporary or more recent historical periods of metaphysics. Th...

Today, philosophers interested in self-knowledge usually look to the scholastic tradition, where the topic is addressed in a systematic and familiar way. Contemporary conceptions of what medieval figures thought about self-knowledge thus skew toward the epistemological. In so doing, however, they often fail to capture the crucial ethical and theological importance that self-knowledge possesses throughout the Middle Ages. -/- Human beings are not transparent to themselves: in particular, knowing oneself in the way needed for moral progress requires hard and (...) rigorous work. Yet, medieval contemplatives insist, without this work we will never attain our final end. In this paper, I trace the connection drawn in this tradition between self-knowledge, humility, and self-fulfillment, arguing in section 1 that the humility that results from introspection needs to be understood in the context of contemplative expectations for eventual perfection. Self-knowledge is key for developing the relationship with God that leads to mystical union, but (as I show in section 2) in the affective tradition of the 13th-14th centuries, which emphasizes the role of emotion and the body, such union with God tends to restore rather than annihilate us. In fact, I argue in section 3, the outcome of such union even in this life is often knowledge that benefits not only the individual who experiences it but also their broader community. (shrink)

Recent advances in neuroimaging technologies have rendered multimodal analysis of operators’ cognitive processes in complex task settings and environments increasingly more practical. In this exploratory study, we utilized optical brain imaging and mobile eye tracking technologies to investigate the behavioral and neurophysiological differences among expert and novice operators while they operated a human-machine interface in normal and adverse conditions. In congruence with related work, we observed that experts tended to have lower prefrontal oxygenation and exhibit gaze patterns that are better (...) aligned with the optimal task sequence with shorter fixation durations as compared to novices. These trends reached statistical significance only in the adverse condition where the operators were prompted with an unexpected error message. Comparisons between hemodynamic and gaze measures before and after the error message indicated that experts’ neurophysiological response to the error involved a systematic increase in bilateral dorsolateral prefrontal cortex (dlPFC) activity accompanied with an increase in fixation durations, which suggests a shift in their attentional state, possibly from routine process execution to problem detection and resolution. The novices’ response was not as strong as that of experts, including a slight increase only in the left dlPFC with a decreasing trend in fixation durations, which is indicative of visual search behavior for possible cues to make sense of the unanticipated situation. A linear discriminant analysis model capitalizing on the covariance structure among hemodynamic and eye movement measures could distinguish experts from novices with 91% accuracy. Despite the small sample size, the performance of the linear discriminant analysis combining eye fixation and dorsolateral oxygenation measures before and after an unexpected event suggests that multimodal approaches may be fruitful for distinguishing novice and expert performance in similar neuroergonomic applications in the field. (shrink)

The paper delves into manuscript sources connected with various disputations held at Prague University from around 1390 to 1420 and singles out a set of hitherto unknown quaestiones dealing with the nature of the human intellect and its relation to the body. Prague disputations from around 1400 arguably offer a unique vantage point on late medieval anthropological issues, since they encompass an entanglement of numerous doctrinal influences from Buridanian De anima commentaries to John Wyclif’s theories. The paper delineates several (...) conceptual tensions regarding the nature of the intellect, e.g., between materialism (entailed by the emphasis on the intellect’s inherence in the body) and personal immortality. It presents several strategies Prague masters employed to overcome these tensions. For example, an anonymous participant of the 1409 quodlibet develops the Buridanian distinction between the rationally demonstrable materialist tendency and the indemonstrable “catholic truth” about the intellect both inhering in and separable from the body. On the other hand, Wyclif’s adherents (Jacob of Mies and another anonymous master) postulate an immortal spirit hypostatically united to each human being beside the human soul educed from the potency of the matter. Yet, the boundaries between the doctrinal standpoints in question seem permeable, whereby a rigid definition of antagonistic groups in late medieval Prague intellectual milieu (e.g., Buridanians vs Wycliffites) is rendered ineffective. (shrink)

Foundational ontologies, central constructs in ontological investigations and engineering alike, are based on ontological categories. Firstly proposed by Aristotle as the very ur- elements from which the whole of reality can be derived, they are not easy to identify, let alone partition and/or hierarchize; in particular, the question of their number poses serious challenges. The late medieval philosopher Dietrich of Freiberg wrote around 1286 a tutorial that can help us today with this exceedingly difficult task. In this paper, I (...) discuss ontological categories and their importance for foundational ontologies from both the contemporary perspective and the original Aristotelian viewpoint, I provide the translation from the Latin into English of Dietrich's De origine II with an introductory elaboration, and I extract a foundational ontology–that is in fact a single-category one–from this text rooted in Dietrich's specification of types of subjecthood and his conception of intentionality as causal operation. (shrink)

One of the singularities of Latin exegesis of Aristotle’s Sophistici elenchi, is that it arbitrarily brought together two families of fallacies, the «figure of speech» and the «accident», despite the fact that they are on either side of the divide between sophisms related to expression and sophisms independent of expression, a divide that lays at the heart of Aristotle’s taxonomy of sophistic arguments. What is behind this surprising identification? The talk is meant to show that it actually originates from a (...) curious mistake in Boethius’ translation of Aristotle’s Sophistici elenchi, 22, 178b 36-37 which radically transformed the nature of the argument at stake. While it was originally an example of the fallacies related to the «figure of speech», Boethius’ translation wrongly brings about two arguments instead of one, both related to the «accident». This explains why authors from the Latin tradition came to think that fallacies of «figure of speech» were linked to fallacies of «accident» closely enough to ask whether they actually fell outside expression, even though it does not at first glance appear that such a possibility was allowed or even suggested by Aristotle’s text. This odd question illustrates some of the remarkable features of the medieval archive and how some of its most peculiar problems came to be. It specifically allows us to reconstruct the mechanisms through which a minor disturbance in the letter of the text leads to a whole new way of organising its exegetical material. (shrink)

The majority of The Legend of the Middle Ages: Philosophical Explorations of Medieval Christianity, Judaism, and Islam has been published previously in different forms, but this edition has been completely revised by the author, the well-known French medievalist and intellectual historian Rémi Brague. It was first published in French under the title Au moyen du Moyen Âge in 2006. The book consists of sixteen essays ranging from Brague’s early years at the Université Panthéon-Sorbonne (Paris I) in the 1990s up (...) until 2005. As a collection of articles, therefore, The Legend of the Middle Ages is not designed to be a monograph; one should not expect a single argument from the book, although it does explore key intersections of medieval religion and philosophy that I will touch upon later. (shrink)

Recent studies in the History of Botany put forth that the books translated to and authored in Arabic have circulated from the East of the Caspian Sea, to the centre of Iberian Peninsula, strengthening the ‘traditional uses’ of plants and alike. An ancient genre of writing called the ‘book on the Materia medica’ was especially the most favourite in Medieval Islamic Geography. In these books, algae have been mentioned among the kinds of medicinal plants. In this study, I investigate (...) several Materia medica books among which I shall first focus on Avicenna’s Canon of Medicine, then have a look at Aliboron’s Book of Pharmacy since these two were contemporary sources from the 11th century. I shall also investigate two illustrated sources, an Arabic copy of Dioscorides’ Materia Medica and al-Ghafiqi’s Book on Simple Drugs, both from the 13th century. In doing so, on the one hand, I will be able to compare the drawings of algae, and on the other I will shed light on the transfer of knowledge on algae. These two methods will result in the textual apparatus and the illustrative apparatus in my study. (shrink)

critical edition and annotated translation of one of the classics of Jewish biblical interpretation. The collection will be indispensable to all students of Jewish history and culture.