This chapter aims to make Introduction to Objectivist Epistemology (ITOE) more accessible both to students of epistemology without a background in Objectivism and to students of Objectivism without a background in epistemology. It begins with a discussion of some figures and issues in the history of philosophy that helps to appreciate what Ayn Rand meant by the advocacy of reason and why she saw the issue of concepts as central to epistemology. The chapter then considers Rand view of consciousness and (...) sense perception, and also discusses her view of the process by which concepts and a whole system of conceptual knowledge are built upon a perceptual foundation. Next, it looks more closely at Rand's conception of objectivity and how it relates to her theory of concepts. Finally, the chapter considers the standards that follow from Rand's theory for the proper formation and use of concepts. (shrink)

The five books of Artemidorus of Ephesus’ Oneirocritica (c. second century CE) constitute the largest collection of divinatory dream-interpretations to survive from Graeco-Roman antiquity. This article examines Artemidorus’ contribution to longstanding medico-philosophical debates over the ontological and epistemic character of such dreams. As with wider Mediterranean traditions concerning premonitory dreams, Greeks and Romans popularly understood them as phenomena with origins exterior to the dreamer (e.g. a visitation of a god). Presocratic and Hippocratic thinkers, however, initiated an effort to bring at (...) least some dream events within the body as interior processes of a physical soul, a bodily turn which ultimately engendered a split in thinking about the possibility and scope of prophetic and diagnostic dreams (e.g. Hippocrates Regimen 4, Aristotle On Prophecy in Dreams, Rufus of Ephesus, and Galen). Here, I examine the way that Artemidorus meant the Oneirocritica to address seriously questions about the origins of dreams and the powers of empirical science in two, related ways. We will see that his defense of oneirocriticism as a techne unfolds along two main axes. First, Artemidorus constructs a necessary veneer of scientific credibility by mobilizing the tropes and organizational strategies characteristic of contemporary technical literature. Secondly, he anchors that authority upon a materialist account of prophetic dreams as “semiotic movements of the soul.” As Price, S. 1986. “The Future of Dreams: From Freud to Artemidorus.” Past & Present 113: 3–36 and Harris-McCoy, D. 2012. Artemidorus’ Oneirocritica: Text, Translation, and Commentary. Oxford: Oxford University Press observed, this explicit commitment to an empirical method of dream-interpretation resembles that of the Hellenistic medical ‘sect’ known as ‘Empiricists,’ who eschewed interest in theoretical etiology in favor of observation, comparison, and compilation of symptoms and outcomes. Pushing beyond similarity, I argue that Artemidorus not only deployed this method to defend empirically grounded accounts of dream-divination (cf. Cicero De div. 1), but endeavored to show that such a scientific method can be used to stabilize and corral productively the potentially infinite number of interpretations any dream-sign might bear without recourse to an underlying, causal theory. (shrink)

Aristotle takes practical wisdom and arts or crafts to be forms of knowledge which, we argue, can usefully be thought of as ‘empiricist’. This empiricism has two key features: knowledge does not rest on grasping unobservable natures or essences; and knowledge does not rest on grasping logical relations that hold among propositions. Instead, knowledge rests on observation, memory, experience and everyday uses of reason. While Aristotle’s conception of theoretical knowledge does require grasping unobservable essences and logical relations that hold among (...) suitable propositions, his conception of practical and productive knowledge avoids such requirements and is consistent with empiricism. (shrink)

The clinical empiricism of Thomas Sydenham (1624–1689) and his definition of especie morbosae represented a substantial turn in the medicine of his time. This turn supposed the shift towards an ontological conception of diseases, from a qualitative to quantitative interpretation. Sydenham’s clinical proposal had a great influence on empiricism philosophical thinking, particularly in John Locke and his delimitation of knowledge. The dialogue between medicine and philosophy, set out by Sydenham-Locke, reactivates the problem of the clinical and theoretical foundations of medical (...) thought, as well as the limits of scientific knowledge. Similar to problem exposed in the Hippocratic treatise On ancient medicine, seventeenth-century medicine seeks its epistemological foundations and the solution to its difficulties in clinical experience, probability and analogy. The aim of this work is to show the Sydenham’s contribution to one of the great controversies between medicine and philosophy. (shrink)

Ancient medical practitioners discussed and debated whether previously unknown kinds of disease had been discovered and whether new diseases could come into existence. The debate over new diseases was of fundamental importance in defining the medical sects which came to dominate elite medicine from the Hellenistic period. This paper offers an overview of the most significant Greek and Roman sources for the debate over new diseases and an account of the origins and significance of this debate.

This article explores Galen's analysis of and response to the Rationalist and Empiricist medical sects. It argues that his interest in their debate concerning the epistemology of medicine and anatomy was key to his advancement of an experimental methodology.

The Empirical school of medicine, which arose in the third century BCE, defined itself in opposition to rationalist tendencies in medical thought. Causal explanation, which typically appeals to hidden, theoretical entities, is most at home in rationalist physiology and pathology, and much of what the Empiricists had to say about causes belongs to their anti-rationalist polemics. Over the course of the school’s history, however, some members appropriated the language and idea of cause, though always in ways that was consistent with (...) its defining commitment to Empiricism. (shrink)