Magnetic resonance imaging (MRI) can provide a number of measurements relevant to sport-related concussion (SRC) symptoms; however, most studies to date have used a single MRI modality and whole-brain exploratory analyses in attempts to localize concussion injury. This has resulted in highly variable findings across studies due to wide ranging symptomology, severity and nature of injury within studies. A multimodal MRI, symptom-guided region-of-interest (ROI) approach is likely to yield more consistent results. The functions of the cerebellum and basal ganglia transcend (...) many common concussion symptoms, and thus these regions, plus the white matter tracts that connect or project from them, constitute plausible ROIs for MRI analysis. We performed diffusion tensor imaging (DTI), resting-state functional MRI, quantitative susceptibility mapping (QSM), and cerebral blood flow (CBF) imaging using arterial spin labeling (ASL), in youth aged 12-18 years following SRC, with a focus on the cerebellum, basal ganglia and white matter tracts. Compared to controls similar in age, sex and sport (N = 20), recent SRC youth (N = 29; MRI at 8 ± 3 days post injury) exhibited increased susceptibility in the cerebellum (p = 0.032), decreased functional connectivity between the caudate and each of the pallidum (p = 0.035) and thalamus (p = 0.021), and decreased diffusivity in the mid-posterior corpus callosum (p < 0.038); no changes were observed in recovered asymptomatic youth (N = 16; 41 ± 16 days post injury). For recent symptomatic-only SRC youth (N = 24), symptom severity was associated with increased susceptibility in the superior cerebellar peduncles (p = 0.011) and reduced activity in the cerebellum (p = 0.013). Fewer days between injury and MRI were associated with reduced cerebellar-parietal functional connectivity (p < 0.014), reduced activity of the pallidum (p = 0.002), increased CBF in the caudate (p = 0.005), and reduced diffusivity in the central corpus callosum (p < 0.05). Youth SRC is associated with acute cerebellar inflammation accompanied by reduced cerebellar activity and cerebellar-parietal connectivity, as well as structural changes of the middle regions of the corpus callosum accompanied by functional changes of the caudate, all of which resolve with recovery. Early MRI post-injury is important to establish objective MRI-based indicators for concussion diagnosis, recovery assessment and prediction of outcome. (shrink)

Philosophical work on truth covers two streams of inquiry, one concerning the nature (if any) of truth, the other concerning truth-related paradox, especially the Liar. For the most part these streams have proceeded fairly independently of each other. In his "Deflationary Truth and the Liar" (JPL 28:455-488, 1999) Keith Simmons argues that the two streams bear on one another in an important way; specifically, the Liar poses a greater problem for deflationary conceptions of truth than it does for inflationist (...) conceptions. We agree with Simmons on this point; however, we disagree with his main conclusion. In a nutshell, Simmons' main conclusion is that deflationists can solve the Liar only by compromising deflationism. If Simmons is right, then deflationists cannot solve the Liar paradox. In this paper we argue that, pace Simmons, there is an approach to the Liar that is available to deflationists, namely dialetheism. (shrink)

The lead-off essay by Kenneth Minogue is an Oakeshottian reflection on the extent to which modern people have become passive spectators of action, detached from traditional loyalties and modes of identity and thus a kind of new Epicurean, shorn of the genuinely contemplative character of the originals. Eric Ormsby follows this with a judicious appraisal of the possibilities and perils for culture associated with the advent of the new information technology. Anthony Daniels provides a similarly sober account of the many (...) consequences and dilemmas of medical technology for the noble Hippocratic art. David Pryce-Jones’s essay recounts the antipolitical utopianism of the totalitarian ideologies that shadowed most of the twentieth century and worries about the potentially destructive utopian tendencies in the contemporary project of European integration. Keith Windschuttle surveys the range of ideologies currently deployed in the academy, most of which derive from vulgarizations of Nietzsche. Edward Said’s influential body of work comes in for particular scrutiny here. Mark Steyn contributes a discussion of the now all-too-familiar self-hatred of Western intellectuals with the blunt precision and wit so characteristic of his splendid newspaper columns. Martin Greenberg’s essay on Burke manages to educe in brief compass the understanding of freedom that is the animating heart of that exemplary statesman’s thought and practice. Diana Schaub makes a case for the importance of political philosophy to the practice of modern politics centered on the statesmanship of Lincoln. Robert Bork’s chapter on the “adversary judiciary” limns the extent to which judges have gone from being the guarantors of the rule of law to the most effective antagonists of traditional institutions and values. Finally, Roger Kimball fittingly recalls the original Ciceronian understanding of culture as the development of the mind analogous to the cultivation of the earth, and connects it with the celebrated program of criticism proposed by Matthew Arnold. (shrink)

Moral reasoning in bioethics -- Bioethics and moral theories -- Paternalism and patient autonomy -- Truth-telling and confidentiality -- Informed consent -- Human research -- Abortion -- Reproductive technology -- Genetic choices -- Euthanasia and physician assisted suicide -- Dividing up health care resources.

In this impressive second edition of Theory of Knowledge, Keith Lehrer introduces students to the major traditional and contemporary accounts of knowing. Beginning with the traditional definition of knowledge as justified true belief, Lehrer explores the truth, belief, and justification conditions on the way to a thorough examination of foundation theories of knowledge,the work of Platinga, externalism and naturalized epistemologies, internalism and modern coherence theories, contextualism, and recent reliabilist and causal theories. Lehrer gives all views careful examination and concludes (...) that external factors must be matched by appropriate internal factors to yield knowledge. This match of internal and external factors follows from Lehrer’s new coherence theory of undefeated justification. In addition to doing justice to the living epistemological traditions, the text smoothly integrates several new lines that will interest scholars. Also, a feature of special interest is Lehrer’s concept of a justification game.This second edition of Theory of Knowledge is a thoroughly revised and updated version that contains several completely new chapters. Written by a well-known scholar and contributor to modern epistemology, this text is distinguished by clarity of structure, accessible writing, and an elegant mix of traditional material, contemporary ideas, and well-motivated innovation. (shrink)

When making decisions, people naturally face uncertainty about the potential consequences of their actions due in part to limits in their capacity to represent, evaluate or deliberate. Nonetheless, they aim to make the best decisions possible. In Decision Theory with a Human Face, Richard Bradley develops new theories of agency and rational decision-making, offering guidance on how 'real' agents who are aware of their bounds should represent the uncertainty they face, how they should revise their opinions as a result (...) of experience and how they should make decisions when lacking full awareness of, or precise opinions on relevant contingencies. He engages with the strengths and flaws of Bayesian reasoning, and presents clear and comprehensive explorations of key issues in decision theory, from belief and desire to semantics and learning. His book draws on philosophy, economics, decision science and psychology, and will appeal to readers in all of these disciplines. (shrink)

Proponents of the public goods argument ('PGA') seek to ground the authority of the state on its putative indispensability as a means of providing public goods. But many of the things we take to be public goods – including many of the goods commonly invoked in support of the PGA – are actually what we might term publicized goods. A publicized good is any whose ‘public’ character results only from a policy decision to make some good freely and universally available. (...) This fact poses complications for the PGA, insofar as the set of possible publicized goods is quite extensive indeed. (shrink)

Recent debate regarding transgender persons’ bathroom-utilization prerogatives raises broader issues concerning current practices of sex segregation more generally. I argue that the only consistently Progressive position on bathroom access is an outright opposition to any form of bathroom segregation. This opposition, in turn, entails a thorough-going rejection of all types of sex- and gender-segregation. I then suggest that Progressives uncomfortable with such wide-ranging implications may wish to consider the merits of a certain Traditionalist position on such matters—one that counsels caution (...) and legislative forbearance when it comes to overturning long-standing customs (such as those embodied in current practices of sex-segregation). (shrink)

Though sometimes maligned, “trolleyology” offers an effective means of opening and framing, not only classes in ethics, but indeed any introductory philosophy course taking a broadly “puzzle-based” approach. When properly sequenced, a subset of the thought experiments that are trolleyology’s stock-in-trade can generate a series of puzzles illustrating the shortcomings of our untutored moral intuitions, and which thus motivate the very enterprise of moral theorizing. Students can be engaged in the attempt to resolve said puzzles, inasmuch as they’re accessible and (...) compelling, and their resolutions generally easy to achieve. Once thus engaged, students can be directed to the fact that they had already rolled up their sleeves and begun “doing philosophy.” In this way, engagement with trolleyological puzzles can serve as a “microcosm” for philosophy more broadly, illustrating the processes of critical thinking that are likewise the stock-in-trade of philosophers across many different domains of inquiry. (shrink)

The Desire-as-Belief thesis (DAB) states that any rational person desires a proposition exactly to the degree that she believes or expects the proposition to be good. Many people take David Lewis to have shown the thesis to be inconsistent with Bayesian decision theory. However, as we show, Lewis's argument was based on an Invariance condition that itself is inconsistent with the (standard formulation of the) version of Bayesian decision theory that he assumed in his arguments against DAB. The aim of (...) this paper is to explore what impact the rejection of Invariance has on the DAB thesis. Without assuming Invariance, we first refute all versions of DAB that entail that there are only two levels of goodness. We next consider two theses according to which rational desires are intimately connected to expectations of (multi-levelled) goodness, and show that these are consistent with Bayesian decision theory as long as we assume that the contents of 'value propositions' are not fixed. We explain why this conclusion is independently plausible, and show how to construct such propositions. (shrink)

Enhanced by many innovative exercises, examples, and pedagogical features, The Power of Critical Thinking: Effective Reasoning About Ordinary and Extraordinary Claims, Second Edition, explores the essentials of critical reasoning, argumentation, logic, and argumentative essay writing while also incorporating material on important topics that most other texts leave out. Author Lewis Vaughn offers comprehensive treatments of core topics, including an introduction to claims and arguments, discussions of propositional and categorical logic, and full coverage of the basics of inductive reasoning. Building (...) on this solid foundation, he also delves into areas neglected by other texts, adding extensive material on "inference to the best explanation" and on scientific reasoning; a thorough look at the evaluation of evidence and credibility; and a chapter on the psychological and social factors that can impede critical thinking. Additional notable elements are a chapter on moral reasoning, advice on how to evaluate Internet sources, and guidelines for evaluating occult, paranormal, or supernatural claims. The Power of Critical Thinking, Second Edition, integrates many pedagogical features including hundreds of diverse exercises, examples, and illustrations; progressive, stand-alone writing modules; numerous text boxes; step-by-step guidelines for evaluating claims, arguments, and explanations; a glossary of important terms; and many reminders, summaries, and review notes throughout. The text is supplemented by a companion website at www.oup.com/us/criticalthinking (offering a student study guide and more), and an Instructor's Manual with Test Questions (available both in print and on a CD). This unique text features a modular structure that allows instructors to teach the chapters in almost any order. Written in a student-friendly style and enhanced by humor where appropriate, it is ideal for courses in critical thinking, introduction to logic, informal logic, argumentative writing, and introduction to argumentation. New to the Second Edition * Full-color throughout and an expanded art program (37 more photos and illustrations) * A new writing module--an annotated sample student paper--and five additional essays for analysis * A new section on evaluating news reports and advertising * Timely discussions of intelligent design and population (nonintervention) studies * Expanded coverage of experts and authors and reasons to doubt their reliability * More "Field Problems" and exercise questions * Chapter objectives and key terms with definitions for each chapter. (shrink)

F. H. Bradley was the foremost philosopher of the British Idealist school, which came to prominence in the second half of the nineteenth century. Bradley, who was a life fellow of Merton College, Oxford, was influenced by Hegel, and also reacted against utilitarianism. He was recognised during his lifetime as one of the greatest intellectuals of his generation and was the first philosopher to receive the Order of Merit, in 1924. His work is considered to have been important (...) to the formation of analytic philosophy. In metaphysics, he rejected pluralism and realism, and believed that English philosophy needed to deal systematically with first principles. This work, first published in 1893, is divided into two parts: 'Appearance' deals with exposing the contradictions that Bradley believed are hidden in our everyday conceptions of the world; and in 'Reality', he builds his positive account of reality and considers possible objections to it. (shrink)

The eminent philosopher Keith Lehrer offers an original and distinctively personal view of central aspects of the human condition, such as reason, knowledge, wisdom, autonomy, love, consensus, and consciousness. He argues that what is uniquely human is our capacity for evaluating our own mental states (such as beliefs and desires), and suggests that we have a system for such evaluation which allows the resolution of personal and interpersonal conflict. The keystone in this system is self-trust, on which reason, knowledge, (...) and wisdom are grounded. (shrink)

Boys, Boyz, Bois concerns questions of ethics, gender and race in popular American images, national discourse and cultural production by and about black men. The book proposes an ethics of masculinity, as ethnics refers to a system of morality and valuation and as ethics refers to a care of the self and ethical subject formation. The texts of analysis include recent films by black/African American filmmakers, gansta rap and hip-hop and black star persona: texts ranging from Blaxploitation and New Black (...) Cinema to contemporary music video to autobiography and the public image of Sidney Poitier. The book is a significant contribution to cultural studies and gender studies and critical race theory. What is distinctive about the book is the question of ethics as a question of race and gender. (shrink)

Doing Ethics is the best-selling book for courses with an applied emphasis. It teaches moral decision making as an active process, giving students the theoretical and logical tools required to do ethics. The Fifth Edition offers expanded coverage of topics that students find relevant, including free speech on campus, hook-up culture, sexual consent, racism, and discrimination. A NEW InQuizitive adaptive learning tool features game-like activities that build mastery of core concepts and theories.

Several social metaphysicians have argued that groups are constituted by, but not identical to, their members. While the constitution view is promising, there are significant difficulties with existing versions of that view. Fortunately, lessons may be extracted from more traditional metaphysics and applied to the case of group agents. Drawing on such lessons, I present a novel account of the constitution relation holding between individuals and group agents. According to the resulting structural-constitution view, when individuals constitute a group of a (...) certain kind, they do so in virtue of exhibiting the structure characteristic of groups of that kind. (shrink)

This paper explores some aspects of the relation between different ways of achieving a consensus on the judgemental values of a group of indviduals; in particular, aggregation and deliberation. We argue firstly that the framing of an aggregation problem itself generates information that individuals are rationally obliged to take into account. And secondly that outputs of the deliberative process that this initiates is in tension with constraints on consensual values typically imposed by aggregation theory, at least when deliberation is modelled (...) as process of learning from others compatible with Bayesian updating principles. (shrink)

The robustness of the classical tests on means (Z, t, and F) and variances (chi square and F) was investigated by obtaining 30,000 (or, sometimes, 10,000 or 150,000) values of the test statistic under assumption-violating conditions and comparing the actual proportion of Type I errors with the proportion expected when all assumptions are met. The sampling and testing conditions investigated were: population shape (L-shape or bell-shape), relative population variance (1 or 4), sample size (8, 16, or 24), nominal significance level (...) (.05,.01, or.001), and location of rejection region (left-tailed, right-tailed, or two-tailed). All tests on means were nonrobust under most of the investigated conditions, and one was nonrobust under all of them. Both tests on variances were extremely nonrobust under virtually all conditions. The worst nonrobustness of the one- and two-independent-sample Z and t tests rivaled or exceeded that of the notoriously nonrobust chi-square and F tests on variances. (shrink)

The desirability of what actually occurs is often influenced by what could have been. Preferences based on such value dependencies between actual and counterfactual outcomes generate a class of problems for orthodox decision theory, the best-known perhaps being the so-called Allais Paradox. In this paper we solve these problems by extending Richard Jeffrey's decision theory to counterfactual prospects, using a multidimensional possible-world semantics for conditionals, and showing that preferences that are sensitive to counterfactual considerations can still be desirability maximising. We (...) end the paper by investigating the conditions necessary and sufficient for a desirability function to be an expected utility. It turns out that the additional conditions imply highly implausible epistemic principles. (shrink)

The alleged robustness of Z, t, and F tests against nonnormality and, when sample sizes are equal, of t and F tests against heterogeneity as well was investigated in a large-scale sampling study under conditions realistic to experimentation and testing in the behavioral sciences. Factors varied were: population shape (L or bell), σ1/σ2 (1/2, 1, or 2), size N of smallest sample (2, 4, 8, 16, 32, 64, 128, 256, 512, or 1,024), N1/N2 (1/3,1/2,1, 2, or 3), α (.05,.01, or.001), (...) and test tailedness (left, right, or two). In about 25% of the situations investigated, the test failed to meet a very lax criterion for robustness at every examined N value less than 100, and in 8% at every value less than 1,000; no test met the criterion in all of the situations studied before N=512. Robustness was strongly influenced by all of the factors investigated, and interactions among the influencing factors were often strong and complex. (shrink)

Quassim Cassam has argued that psychological and epistemological analyses of conspiracy theories threaten to overlook the political nature of such theories. According to Cassam, conspiracy theories are a form of political propaganda. I develop a limited critique of Cassam's analysis.This paper advances two core theses. First, acceptance of conspiracy theories requires a rejection of epistemic authority that renders conspiracy theorists susceptible to co-option by certain political programs while insulating such programs from criticism. I argue that the contrarian nature of conspiracy (...) theories partially accounts for the prominence of such theories in populist movements.Second, the contrarian nature of conspiracy theories partially accounts for their attractiveness, especially among those to whom populism already appeals. I argue that for those who resent what appears from their perspective as the shaping of the epistemic landscape by alien perspectives, conspiracy theorizing may facilitate the reassertion of epistemic autonomy. (shrink)

Mereological nihilism is the view that no objects have proper parts. Despite how counter‐intuitive it is, it is taken quite seriously, largely because it solves a number of puzzles in the metaphysics of material objects – or so its proponents claim. In this article, I show that for every puzzle that mereological nihilism solves, there is a similar puzzle that (a) it doesn’t solve, and (b) every other solution to the original puzzle does solve. Since the solutions to the new (...) puzzles apply just as well to the old puzzles, the old puzzles provide no motivation to be a mereological nihilist. (shrink)

In this paper, I articulate and argue for a new truthmaker view of ontological commitment, which I call the “General Truthmaker View”: when one affirms a sentence, one is ontologically committed to there being something that makes true the proposition expressed by the sentence. This view comes apart from Quinean orthodoxy in that we are not ontologically committed to the things over which we quantify, and it comes apart from extant truthmaker views of ontological commitment in that we are not (...) ontologically committed to the truthmakers of our sentences. (shrink)

These essays critically reassess the widely accepted view that statistical methods of analysis can, and do, yield causal understanding of social phenomena. They emphasize the historical, philosophical and conceptual perspectives that underlie and inform current methodological controversies.

The Progressive favors extending the legal institution of marriage so as to include same-sex unions along with heterosexual ones. The Traditionalist opposes such an extension, preferring to retain the legal institution of marriage in its present form. I argue that the Progressive ought to broaden her position, endorsing instead the Liberal case for extending the current institution so as to include polygamous unions as well—for any consideration favoring Progressivism over Traditionalism likewise favors Liberalism over Progressivism. Progressives inclined to resist Liberalism (...) are invited to consider an alternative position: the Libertarian stance that favors instead the ‘disestablishment’ of marriage. (shrink)

In this paper, I offer a new theory of grounding. The theory has it that grounding is a job description that is realized by different properties in different contexts. Those properties play the grounding role contingently, and grounding is the property that plays the grounding role essentially. On this theory, grounding is monistic, but ‘grounding’ refers to different relations in different contexts. First, I argue against Kit Fine’s monist univocalism. Next, I argue against Jessica Wilson’s pluralist multivocalism. Finally, I introduce (...) monist multivocalism, explicate three versions of it (of which the above is one), and show its advantages. (shrink)

This paper brings together two positions that for the most part have been developed and defended independently of one another: contextualism about knowledge attributions and the knowledge account of assertion.

This paper describes the ways in which trolls and bots impede the acquisition of knowledge online. I distinguish between three ways in which trolls and bots can impede knowledge acquisition, namely, by deceiving, by encouraging misplaced skepticism, and by interfering with the acquisition of warrant concerning persons and content encountered online. I argue that these threats are difficult to resist simultaneously. I argue, further, that the threat that trolls and bots pose to knowledge acquisition goes beyond the mere threat of (...) online misinformation, or the more familiar threat posed by liars offline. Trolls and bots are, in effect, fake persons. Consequently, trolls and bots can systemically interfere with knowledge acquisition by manipulating the signals whereby individuals acquire knowledge from one another online. I conclude with a brief discussion of some possible remedies for the problem of fake persons. (shrink)

The dispute between Kantians and Humeans over whether practical reason can justify moral reasons for all agents is often characterized as a debate over whether reasons are hypothetical or categorical. Instead, this debate must be understood in terms of the distinction between agent-neutral and agent-relative reasons. This paper considers Alan Gewirth’s Reason and Morality as a case study of a Kantian justification of morality focused on deriving categorical reasons from hypothetical reasons. The case study demonstrates first, the possibility of categorical (...) agent-relative reasons, and second, that inattention to this possibility has caused considerable confusion in the debate between Kantians and Humeans. (shrink)

Recent Darwin scholarship has provided grounds for recognising the Origin as a literary as well as a scientific achievement. While Darwin was an acute observer, a gifted experimentalist and indefatigable theorist, this essay argues that it was also crucial to his impact that the Origin transcended the putative divide between the scientific and the literary. Analysis of Darwin’s development as a writer between his journal-keeping on HMS Beagle and his construction of the Origin argues the latter draws on the pattern (...) of the Romantic or Kantian sublime. The Origin repeatedly uses strategies which challenge the natural-theological appeal to the imagination in conceiving nature. Darwin’s sublime coaches the Origin’s readers into a position from which to envision nature that reduces and contains its otherwise overwhelming complexity. As such, it was Darwin’s literary achievement that enabled him to fashion a new ‘habit of looking at things in a given way’ that is the centrepiece of the scientific revolution bearing his name. (shrink)

For each of the N-values 2, 4, 8, 16, 32, 64, 128, 256, 512, and 1,024, 50,000 samples of size N were drawn from an L-shaped population, and for each sample the Z and t statistics were calculated. The resulting distributions of 50,000 Z or t values at each sample size were then used to study the robustness of left-tailed, right-tailed, and two-tailed Z and t tests at α levels of.05,.01, and.001 (and, for Z only,.0001). The actually obtained proportion, ρ, (...) of Type I errors was often far greater or far smaller than the nominal proportion, α. Furthermore, although α is the expected value of ρ at infinite N, no N-value below 512 ever brought the deviation of p from α to within 10% of α for any t tests or one-tailed Z tests. (shrink)

This book is available either individually, or as part of the specially-priced Arguments of the Philosphers Collection.