Cognitive representation is the single most important explanatory notion in the sciences of the mind and has served as the cornerstone for the so-called 'cognitive revolution'. This book critically examines the ways in which philosophers and cognitive scientists appeal to representations in their theories, and argues that there is considerable confusion about the nature of representational states. This has led to an excessive over-application of the notion - especially in many of the fresher theories in computational neuroscience. Representation Reconsidered shows (...) how psychological research is actually moving in a non-representational direction, revealing a radical, though largely unnoticed, shift in our basic understanding of how the mind works. (shrink)

Ancients and moderns alike have constructed arguments and assessed theories on the basis of common sense and intuitive judgments. Yet, despite the important role intuitions play in philosophy, there has been little reflection on fundamental questions concerning the sort of data intuitions provide, how they are supposed to lead us to the truth, and why we should treat them as important. In addition, recent psychological research seems to pose serious challenges to traditional intuition-driven philosophical inquiry. Rethinking Intuition brings together a (...) distinguished group of philosophers and psychologists to discuss these important issues. Students and scholars in both fields will find this book to be of great value. (shrink)

In this paper my aim is to get clearer on what eliminative materialism actually does and does not entail. I look closely at one cluster of views that is often described as a form of eliminativism in contemporary philosophy and cognitive science and try to show that this characterization is a mistake. More specifically, I look at conceptions of eliminativism recently endorsed by writers such as Edouard Machery, Paul Griffiths, Valerie Hardcastle and others, and argue that although these views do (...) endorse the elimination of something, they offer only what I will call a sort of category dissolution, and should be treated as something altogether different from traditional eliminativism. Spelling out the main contrast between eliminative materialism proper and this alternative view, and defending the need to keep them distinct, is my primary objective. As I show, a central irony is that proponents of the problematic outlook often insist that divergent things should not be classified together under a single label. By characterizing their own views as a form of eliminativism, they commit a fundamental error that they themselves argue should not be made. While my focus here is on eliminative materialism, the error I intend to highlight appears across various discussions about alleged eliminativism of all sorts of things. (shrink)

Artificial intelligence, or AI, is a cross-disciplinary approach to understanding, modeling, and creating intelligence of various forms. It is a critical branch of cognitive science, and its influence is increasingly being felt in other areas, including the humanities. AI applications are transforming the way we interact with each other and with our environment, and work in artificially modeling intelligence is offering new insights into the human mind and revealing new forms mentality can take. This volume of original essays presents the (...) state of the art in AI, surveying the foundations of the discipline, major theories of mental architecture, the principal areas of research, and extensions of AI such as artificial life. With a focus on theory rather than technical and applied issues, the volume will be valuable not only to people working in AI, but also to those in other disciplines wanting an authoritative and up-to-date introduction to the field. (shrink)

Attacks on religious doctrines are often characterized as a form of bigotry and traditional analyses of the concept support this view. I argue that regarding such attacks as bigotry is inconsistent with a variety of contemporary moral attitudes and social goals. I offer an improved account of when we should ascribe bigotry – one that is more coherent with views on tolerance and the importance of open debate. This account focuses upon the justification for hostile attitudes and also limits the (...) target of bigoted thought to persons, not to doctrines, religious or otherwise. I argue that while it is indeed possible to adopt bigoted attitudes toward people classified on the basis of their religious beliefs, it is not possible to hold bigoted attitudes against the beliefs themselves. (shrink)

The philosophy of cognitive science has recently become one of the most exciting and fastest growing domains of philosophical inquiry and analysis. Until the early 1980s, nearly all of the models developed treated cognitive processes -- like problem solving, language comprehension, memory, and higher visual processing -- as rule-governed symbol manipulation. However, this situation has changed dramatically over the last half dozen years. In that period there has been an enormous shift of attention toward connectionist models of cognition that are (...) inspired by the network-like architecture of the brain. Because of their unique architecture and style of processing, connectionist systems are generally regarded as radically different from the more traditional symbol manipulation models. This collection was designed to provide philosophers who have been working in the area of cognitive science with a forum for expressing their views on these recent developments. Because the symbol-manipulating paradigm has been so important to the work of contemporary philosophers, many have watched the emergence of connectionism with considerable interest. The contributors take very different stands toward connectionism, but all agree that the potential exists for a radical shift in the way many philosophers think of various aspects of cognition. Exploring this potential and other philosophical dimensions of connectionist research is the aim of this volume. (shrink)

In “Connectionism and the fats of folk psychology”, Forster and Saidel argue that the central claim of Ramsey, Stich and Garon (1991)—that distributed connectionist models are incompatible with the causal discreteness of folk psychology—is mistaken. To establish their claim, they offer an intriguing model which allegedly shows how distributed representations can function in a causally discrete manner. They also challenge our position regarding projectibility of folk psychology. In this essay, I offer a response to their account and show how (...) their model fails to demonstrate that our original argument was mistaken. While I will discuss several difficulties with their model, my primary criticism will be that the features of their model that are causally discrete are not truly distributed, while the features that are distributed are not really discrete. Concerning the issue of projectibility, I am more inclined to agree with Forster and Saidel and I offer a revised account of what we should have said originally. (shrink)

Charles Francis Digby Moule, a Fellow of the British Academy, was probably the most influential British New Testament scholar of his time. The youngest of their three children, he was born in the same house as his father, and spent a happy if often solitary childhood in China. Moule spent three years studying theology and training for Holy Orders in the Church of England at Ridley Hall. He soon had to take on leadership of New Testament teaching at the University (...) of Cambridge for the Regius Professor, A. M. Ramsey. Moule was also fascinated, without losing his head as a critic, by the associated question of interaction between liturgy and literature in the early church, posed by such cultic interpreters of the gospels as G. Bertram. He joined the Evangelical Fellowship for Theological Literature, founded in 1942, an impressive body of younger authors that came to include Henry Chadwick, G. W. H. Lampe, S. L. Greenslade, and F. W. Dillistone; the moving spirit was Max Warren. (shrink)

Medieval interpretations of hylomorphism, in which substances are conceived as metaphysical composites of prime matter and substantial form, are receiving attention in contemporary philosophy. It has even been suggested that a recovery of Aquinas's conception of prime matter as a ‘pure potentiality’, lacking any actuality apart from substantial form, may be expedient in hylomorphic interpretations of quantum mechanics. In this paper, we consider a recent hylomorphic interpretation of non-relativistic quantum mechanics, the theory of Cosmic Hylomorphism, which does not explicitly invoke (...) any notion of prime matter in its original formulation. We argue that prime matter does in fact play a role in constituting and individuating particles in this theory. However, we demonstrate that the notion of prime matter which features in the extended version of Cosmic Hylomorphism that we propose here is distinct from Aquinas's conception of prime matter, inasmuch as it has discrete metaphysical parts. (shrink)

Goodman draws together, in this memoir, his explorations of meaning and coincidence, and his lived experiences of chance, and his professional experiences teaching, writing, and consulting about risk. The book opens by describing the author's life-changing encounter with a Zen Buddhist monk in 1977, over a cup of tea. Returning to his beginnings, Goodman recounts his coming-of-age, from participating the 1960’s U.S. protests and Vietnam-War resistance, to finally settling down in Canada. He describes his role in a supporting, silent vigil (...) around Willard Straight Hall at Cornell University, the night after it had been occupied by protestors, and his later application for Conscientious Objector status, following the U.S. draft lottery in 1969. He reflects on the challenges and changes on his road taken, in his career and personal relationships, and in spiritual searches, to share some insights about the seamless nature of chance, and about seeing a Both/And perspective in life that encourages openness to possibilities. -/- . (shrink)

This book records almost 50 years' worth of developing and explaining a new way of thinking about behavior. It represents a journey more than a goal. I came to see that the science of behavior needed a new paradigm, and two sorts of changes were required. First, the old molecular view inherited from the nineteenth century, based on discrete responses and contiguity, had to be replaced by a view based on the dynamics of behavior. Behavior is manifestly process and cannot (...) be contained in little momentary packets. Behavior is flow and requires measures and theories that acknowledge its temporal extendedness. Such a new ("molar") view offers plausible and elegant explanations both of laboratory results and of phenomena in the everyday world. The molecular view falls short on both counts. (shrink)

Called the “greatest philosophical essayist of his time,” Rorty is both famous and notorious in academic philosophy for his uniquely engaging writing style. While his fellow analytic philosophers look askance at his flamboyant prose, suspicious that it lacks the care and precision that their discipline demands, literary intellectuals who champion the essay genre can have their qualms about Rorty as well: his work is too professional and specialized to be properly called essays. I argue not only that Rorty's work fits (...) into the essay genre, but also that his use of the essay form is integral to his rhetorical project of advancing his ideal of pragmatic liberalism. Rorty writes essays because the essay is a pragmatic literary genre: it is anti‐essentialist, conversational, and experimentalist and provocatively aims at “breaking the crust of convention,” in Dewey's phrase. Using the essay, Rorty “joshes” us to becoming more pragmatic and, therefore, better liberals. (shrink)

William Ramsey’s Representation Reconsidered is a superb, insightful analysis of the notion of mental representation in cognitive science. The book presents an original argument for a bold conclusion: partial eliminativism about mental representation in scientific psychology. According to Ramsey, once we examine the conditions that need to be satisfied for something to qualify as a representation, we can see those conditions are not fulfilled by the ‘representations’ posited by much of modern psychology. Cognitive science—or at least large (...) swathes of it—has no warrant for positing representations. The structure of Ramsey’s argument repeats a familiar eliminativist strategy (c.f. Churchland (1981); Stich (1983)).1 First step: argue that in order for something to be an X, it must satisfy a certain description D (say, beliefs must satisfy the description given in folk psychology). Second step: argue that to the best of our knowledge, nothing satisfies description D (e.g. folk psychology is false). Third step: conclude that since nothing satisfies description D, there are no Xs (no beliefs). Here is how the strategy is played out in the book. First, Ramsey argues for certain minimal conditions that a representation must satisfy (what he calls the ‘job description’). Second (this takes the bulk of the book), he considers the ways in which our best psychological theories use the notion of representation. Ramsey argues that none of these uses satisfy the job description associated with a genuine representation. (A wrinkle is that some representations—those posited by the classical computational theory of cognition—do qualify as true representations. But, Ramsey claims, classical theories are in a minority in cognitive science, and their hold on the field is shrinking.) Therefore, Ramsey concludes, in most of cognitive science, there are no mental representations. (shrink)

Socrates (469-399 BC) is one of history's most enigmatic figures. Our knowledge of him comes to us second-hand, primarily from the philosopher Plato, who was Socrates' most gifted student, and from the historian and sometime-philosopher Xenophon, who counted himself as a member of Socrates' inner circle of friends. We also hear of Socrates in one comic play produced during his lifetime (Aristophanes' Clouds) and in passing from the philosopher Aristotle, a student of Plato. Socrates is a figure of enduring interest. (...) He is often considered the father of Western Philosophy, yet the four most famous accounts we have of him present a contradictory, confusing picture. Just who was Socrates? A brilliant philosopher, at times confounding and infuriating, morally serious and yet ironic; the ever-worldly man, sometime mystic, and uncommon martyr depicted by Plato? Or did Plato conflate Socrates' views with his own startling genius, as Aristotle suggests? Was So rates instead the less impressive, more mundane man whose commonsense impressed the laconic Xenophon? Or was Socrates the charlatan, the long-winded phony of Aristophanes' play? The Socratic works of Diogenes Laertius (3rd century AD), Libanius (AD 314 -- c. 393), Maximus of 'Tyre (2nd century AD), and Apuleius (born c. AD 125) add important dimensions to the portrait of Socrates: Diogenes Laertius' Life of Socrates emphasizes Socrates' deep ethical nature and his extraordinary personality; Libanius' Apology of Socrates is based on sources now lost to us; Maximus of Tyre's Whether Socrates Did the Right Thing When He Did Not Defend Himself makes the star ling claim (against testimony of Plato and Xenophon) that Socrates never spoke athis own trial; from Apuleius' On the God of Socrates we hear at length of Socrates' infamous daimonion: the "divine sign" only mentioned elsewhere, the sign that warned Socrates against certain courses of action. In short, from these four texts we are reintroduced to Socrates, and new wrinkles are added to an already intriguing historical figure. (shrink)

This essay draws on Ludwig Wittgenstein’s work to argue for a practice-oriented concept of expertise. We propose that conceptualizing types of expertise as having a family resemblance, relative to the problems such expertise addresses, escapes certain limitations of defining expertise as primarily epistemic. Recognizing the pragmatic purchase on actual problems a Wittgensteinian approach provides to discussions of expertise, we seek to understand the nature of expertise in situations where the people who need to make a difficult decision do not possess (...) or have access to the epistemic status that traditionally confers expertise. These are situations where people need to answer difficult questions that, while they may be informed by expertise in the epistemic register, are ultimately decided by expertise that weighs certified knowledge against the intractable characteristics of a particular situation. We suggest that there is not—even deep down on a conceptual level—only one kind of expertise, but multiple kinds of expertise that resonate with diverse kinds of problems. (shrink)

Esfeld has proposed a minimalist ontology of nature called ‘super-Humeanism’ that purports to accommodate quantum phenomena and avoid standard objections to neo-Humean metaphysics. I argue that Esfeld’s sparse ontology has counterintuitive consequences and generates two self-undermining dilemmas concerning the nature of time and space. Contrary to Esfeld, I deny that super-Humeanism supports an ontology of microscopic particles that follow continuous trajectories through space.

The guitar as such achieved aesthetic prominence starting in the mid-1950s. Formerly employed as a rhythm instrument in big bands, or as a battered tool to accompany the vocals of itinerant troubad...

Albert Camus’s journals of his travels to North America (1946) and South America (1949) offer his astute perspectives on literature, the arts, and Western politics in the aftermath of World War II....

_Examining inequality through the lenses of moral traditions_ Rising inequality has attracted a great deal of attention in recent years from scholars and politicians, but the moral dimensions of inequality tend to be ignored. Is inequality morally acceptable? Is it morally permissible to allow practices and systems that contribute to inequality? Is there an ethical obligation to try to alleviate inequality, and if so, who is obligated to take that action? This book addresses these and similar questions not through a (...) single lens of morality but through a comparative study of ethical traditions, both secular and religious, Western and non-Western. The moral and political traditions considered are: liberalism, Marxism, natural law, feminism, Buddhism, Judaism, Islam, Christianity, and Confucianism. The types of inequality examined include property, natural resources, products, wealth, income, jobs, and taxation. The editors open the book with an introduction providing information on contemporary dimensions of the problem of economic inequality, and the book concludes with a summary of the perspectives represented. _Economic Inequality and Morality_ is unusual in that it addresses similarities and differences on the questions of inequality within and across moral traditions. Authors of the individual studies answer a common set of topic-related questions, giving the reader a broad perspective on how a broad range of traditions view and respond to inequality. (shrink)

The last two decades have seen two significant trends emerging within the philosophy of science: the rapid development and focus on the philosophy of the specialised sciences, and a resurgence of Aristotelian metaphysics, much of which is concerned with the possibility of emergence, as well as the ontological status and indispensability of dispositions and powers in science. Despite these recent trends, few Aristotelian metaphysicians have engaged directly with the philosophy of the specialised sciences. Additionally, the relationship between fundamental Aristotelian concepts—such (...) as "hylomorphism", "substance", and "faculties"—and contemporary science has yet to receive a critical and systematic treatment. _Neo-Aristotelian Perspectives on Contemporary Science _aims to fill this gap in the literature by bringing together essays on the relationship between Aristotelianism and science that cut across interdisciplinary boundaries. The chapters in this volume are divided into two main sections covering the philosophy of physics and the philosophy of the life sciences. Featuring original contributions from distinguished and early-career scholars, this book will be of interest to specialists in analytical metaphysics and the philosophy of science. (shrink)

Programmed cell death (PCD) in unicellular organisms is in some instances an altruistic trait. When the beneficiaries are clones or close kin, kin selection theory may be used to explain the evolution of the trait, and when the trait evolves in groups of distantly related individuals, group or multilevel selection theory is invoked. In mixed microbial communities, the benefits are also available to unrelated taxa. But the evolutionary ecology of PCD in communities is poorly understood. Few hypotheses have been offered (...) concerning the community role of PCD despite its far-reaching effects. The hypothesis we consider here is that PCD is a black queen. The Black Queen Hypothesis (BQH) outlines how public goods arising from a leaky function are exploited by other taxa in the community. Black Queen (BQ) traits are essential for community survival, but only some members bear the cost of possessing them, while others lose the trait In addition, BQ traits have been defined in terms of adaptive gene loss, and it is unknown whether this has occurred for PCD. Our conclusion is that PCD fulfils the two most important criteria of a BQ (leakiness and costliness), but that more empirical data are needed for assessing the remaining two criteria. In addition, we hold that for viewing PCD as a BQ, the original BQH needs to include social traits. Thus, despite some empirical and conceptual shortcomings, the BQH provides a helpful avenue for investigating PCD in microbial communities. (shrink)

The primitive ontology approach to quantum mechanics seeks to account for quantum phenomena in terms of a distribution of matter in three-dimensional space and a law of nature that describes its temporal development. This approach to explaining quantum phenomena is compatible with either a Humean or powerist account of laws. In this paper, I offer a powerist ontology in which the law is specified by Bohmian mechanics for a global configuration of particles. Unlike in other powerist ontologies, however, this law (...) is not grounded in a structural power that is instantiated by the global configuration. Instead, I combine the primitive ontology approach with Aristotle’s doctrine of hylomorphism to create a new metaphysical model, in which the cosmos is a hylomorphic substance with an intrinsic power to choreograph the trajectories of the particles. (shrink)

This article reports the results of a study of confirmational response bias among social work journals. A contrived research paper with positive findings and its negative mirror image were submitted to two different groups of social work journals and to two comparison groups of journals outside social work. The quantitative results, suggesting bias, are tentative; but the qualitative findings based upon an analysis of the referee comments are clear and consistent. Few referees from prestigious or nonprestcgrous social work journals prepared (...) reviews that were knowledgeable, scientifically astute, or objective. The best reviews came from journals outside of soccal work or from journals that are accepted as social work journals but originate with other disciplines. (shrink)

The wave function of quantum mechanics can be understood in terms of the dispositional role it plays in the dynamics of a distribution of matter in three-dimensional space (or four-dimensional spacetime). There is more than one way, however, of specifying its dispositional role. This paper considers Suárez’s theory of ‘Bohmian dispositionalism’, in which the particles are endowed with their own ‘Bohmian dispositions’, and Simpson’s theory of ‘Cosmic Hylomorphism’, in which the particle configuration comprises a hylomorphic substance which has an intrinsic (...) power. I argue that Bohmian dispositionalism fails to capture intuitively correct counterfactuals about what would happen in Small Worlds which have only a small number of particles, but that this problem is avoided by Cosmic Hylomorphism, in which the cosmic power manifests a teleological process. (shrink)

In multicellular organisms, cells are frequently programmed to die. This makes good sense: cells that fail to, or are no longer playing important roles are eliminated. From the cell’s perspective, this also makes sense, since somatic cells in multicellular organisms require the cooperation of clonal relatives. In unicellular organisms, however, programmed cell death poses a difficult and unresolved evolutionary problem. The empirical evidence for PCD in diverse microbial taxa has spurred debates about what precisely PCD means in the case of (...) unicellular organisms. In this article, we survey the concepts of PCD in the literature and the selective pressures associated with its evolution. We show that definitions of PCD have been almost entirely mechanistic and fail to separate questions concerning what PCD fundamentally is from questions about the kinds of mechanisms that realize PCD. We conclude that an evolutionary definition is best able to distinguish PCD from closely related phenomena. Specifically, we define “true” PCD as an adaptation for death triggered by abiotic or biotic environmental stresses. True PCD is thus not only an evolutionary product but must also have been a target of selection. Apparent PCD resulting from pleiotropy, genetic drift, or trade-offs is not true PCD. We call this “ersatz PCD.”. (shrink)

Emily Carroll and Parker Crutchfield propose a new inconsistency argument against abortion restrictivism. In response, I raised several objections to their argument. Recently Carroll and Crutchfield have replied and seem to be under the impression that I’m a restrictivist. This is puzzling, since my criticism of their view included a very thinly veiled, but purposely more charitable, anti-restrictivist inconsistency argument. In this response, I explain how Carroll and Crutchfield mischaracterize my position and that of the restrictivist.

Sullivan and Kymlicka seek to provide an alternative to post-9/11 pessimism about the ability of serious ethical dialogue to resolve disagreements and conflict across national, religious, and cultural differences. It begins by acknowledging the gravity of the problem: on our tightly interconnected planet, entire populations look for moral guidance to a variety of religious and cultural traditions, and these often stiffen, rather than soften, opposing moral perceptions. How, then, to set minimal standards for the treatment of persons while developing moral (...) bases for coexistence and cooperation across different ethical traditions? The Globalization of Ethics argues for a tempered optimism in approaching these questions. Its distinguished contributors report on some of the most globally influential traditions of ethical thought in order to identify the resources within each tradition for working toward consensus and accommodation among the ethical traditions that shape the contemporary world. (shrink)

This article reports original research examining characteristics of the active followers of the American animal rights movement. Typical respondents were Caucasian, highly educated urban professional women approximately thirty years old with a median income of $33,000. Most activists think of themselves as Democrats or as Independents, and have moderate to liberal political views. They were often suspicious of science and made no distinctions between basic and applied science, or public versus private animal-based research. The research suggests that animal rights activism (...) is in part a symbolic manifestation of egalitarian social and political views concerning scientific and technological change. (shrink)

The publication of this unique three-volume set represents the culmination of years of work by a large number of scholars, researchers, and professionals in the field of moral development. The literature on moral behavior and development has grown to the point where it is no longer possible to capture the “state of the art” in a single volume. This comprehensive multi-volume Handbook marks an important transition because it provides evidence that the field has emerged as an area of scholarly activity (...) in its own right. Spanning many professional domains, there is a striking variety of issues and topics surveyed: anthropology, biology, economics, education, philosophy, psychology, psychiatry, sociology, social work, and more. By bringing together work on diverse topics, the editors have fostered a mutually-beneficial exchange not only between alternative approaches and perspectives, but also between “applied” and “pure” research interests. The Theory volume presents current and ongoing theoretical advances focusing on new developments or substantive refinements and revisions to existing theoretical frameworks. The Research volume summarizes and interprets the findings of specific, theory-driven, research programs; reviews research in areas that have generated substantial empirical findings; describes recent developments in research methodology/techniques; and reports research on new and emerging issues. The Application volume describes a diverse array of intervention projects — educational, clinical, organizational, and the like. Each chapter includes a summary report of results and findings, conceptual developments, and emerging issues or topics. Since the contributors to this publication are active theorists, researchers, and practitioners, it may serve to define directions that will shape the emerging literature in the field. (shrink)

The “problem of emotions,” that is, that many of them are both meaningful and corporeal, has yet to be resolved. Western thinkers, from Augustine to Descartes to Zajonc, have handled this problem by employing various forms of mind–body dualism. Some psychologists and neuroscientists since the 1970s have avoided it by talking about cognitive and emotional “processing,” using a terminology borrowed from computer science that nullifies the meaningful or intentional character of both thought and emotion. Outside the Western-influenced contexts, emotion and (...) thought are not seen as distinct kinds of things. Here a solution of sorts is proposed by thinking of emotional expression as a dynamic activity that declares and stirs emotions at the same time. As such, its dynamism may help historians to understand the dramatic changes and trends they investigate. (shrink)

This title is part of UC Press's Voices Revived program, which commemorates University of California Press’s mission to seek out and cultivate the brightest minds and give them voice, reach, and impact. Drawing on a backlist dating to 1893, Voices Revived makes high-quality, peer-reviewed scholarship accessible once again using print-on-demand technology. This title was originally published in 1986.

Church's simple theory of types is a system of higher-order logic in which functions are assumed to be total. We present in this paper a version of Church's system called PF in which functions may be partial. The semantics of PF, which is based on Henkin's general-models semantics, allows terms to be nondenoting but requires formulas to always denote a standard truth value. We prove that PF is complete with respect to its semantics. The reasoning mechanism in PF for partial (...) functions corresponds closely to mathematical practice, and the formulation of PF adheres tightly to the framework of Church's system. (shrink)

Organismal death is foundational to the evolution of life, and many biological concepts such as natural selection and life history strategy are so fashioned only because individuals are mortal. Organisms, irrespective of their organization, are composed of basic functional units—cells—and it is our understanding of cell death that lies at the heart of most general explanatory frameworks for organismal mortality. Cell death can be exogenous, arising from transmissible diseases, predation, or other misfortunes, but there are also endogenous forms of death (...) that are sometimes the result of adaptive evolution. These endogenous forms of death—often labeled programmed cell death, PCD—originated in the earliest cells and are maintained across the tree of life. Here, we consider two problematic issues related to PCD (and cell mortality generally). First, we trace the original discoveries of cell death from the nineteenth century and place current conceptions of PCD in their historical context. Revisions of our understanding of PCD demand a reassessment of its origin. Our second aim is thus to structure the proposed origin explanations of PCD into coherent arguments. In our analysis we argue for the evolutionary concept of PCD and the viral defense-immunity hypothesis for the origin of PCD. We suggest that this framework offers a plausible account of PCD early in the history of life, and also provides an epistemic basis for the future development of a general evolutionary account of mortality. (shrink)