We report the results of three experiments designed to assess the role of suppositions in human reasoning. Theories of reasoning based on formal rules propose that the ability to make suppositions is central to deductive reasoning. Our first experiment compared two types of problem that could be solved by a suppositional strategy. Our results showed no difference in difficulty between problems requiring affirmative or negative suppositions and very low logical solution rates throughout. Further analysis of the error data showed a (...) pattern of responses, which suggested that participants reason from a superficial representation of the premises in these arguments and this drives their choice of conclusion. Our second experiment employed a different set of suppositional problems but with extremely similar proofs in terms of the rules applied and number of inferential steps required. As predicted by our interpretation of reasoning strategies employed in Experiment 1, logical performance was very much higher on these problems. Our third experiment showed that problems that could be solved by constructing an initial representation of the premises were easier than problems in which this representation was not sufficient. This effect was independent of the suppositional structure of the problems. We discuss the implications of this research for theories of reasoning based on mental models and inference rules. (shrink)

Background and aims: Recent investigations have highlighted the value of neuropsychological testing for the assessment and screening of Alcohol-Related Brain Damage. The aim of the present study was to evaluate the suitability of the Addenbrooke’s Cognitive Examination and the Repeatable Battery for the Assessment of Neuropsychological Status for this purpose. Methods: Comparing 28 participants with ARBD and 30 alcohol-dependent participants without ARBD we calculated Area Under the Curve statistics, sensitivity and specificity values, base-rate adjusted predictive values, and likelihood ratios for (...) both tests. Results: High levels of screening accuracy were found for the total scores of both the ACE-III and RBANS at multiple cut-off points. Removing participants with a history of polysubstance from the samples improved the diagnostic capabilities of the RBANS substantially, while only minor improvements to the ACE-III’s accuracy were observed. Conclusions: Overall, both the ACE-III and RBANS are suitable tools for ARBD screening within an alcohol-dependent population, though the RBANS is the superior of the two. Clinicians using these tools for ARBD screening should be cautious of false-positive outcomes and should therefore combine them with other assessment methods and more detailed neuropsychological testing before reaching diagnostic decisions. (shrink)

A study is reported which focused on the problem-solving strategies employed by expert electronics engineers pursuing a real-world task: integrated-circuit design. Verbal protocol data were analysed so as to reveal aspects of the organisation and sequencing of ongoing design activity. These analyses indicated that the designers were implementing a highly systematic solution-development strategy which deviated only a small degree from a normatively optimal top-down and breadth-first method. Although some of the observed deviation could be described as opportunistic in nature, much (...) of it reflected the rapid depth-first exploration of tentative solution ideas. We argue that switches from a predominantly breadth-first mode of problem solving to depth-first or opportunistic modes may be an important aspect of the expert's strategic knowledge about how to conduct the design process effectively when faced with difficulties, uncertainties, and design impasses. (shrink)

This qualitative study was positioned within an emerging scientific field concerned with the interaction between biblical text and the psychological profile of the preacher. The theoretical framework was provided by the sensing, intuition, feeling and thinking approach to biblical hermeneutics, an approach rooted in reader-perspective hermeneutical theory and in Jungian psychological type theory that explores the distinctive readings of sensing perception and intuitive perception, and the distinctive readings of thinking evaluation and feeling evaluation. The empirical methodology was provided by developing (...) a research tradition concerned with applying the SIFT approach to biblical text. In the present study, a group of 17 Anglican clergy were invited to work in psychological type-alike groups to explore two of the biblical passages identified by Year B of the Revised Common Lectionary for the Feast of Christ the King. Dividing into three workshops, according to their preferences for sensing and intuition, the clergy explored Psalm 93. Dividing into three workshops, according to their preferences for thinking and feeling, the clergy explored John 18:33–37. The rich data gathered from these workshops supported the hypothesis that biblical interpretation and preaching may be shaped by the reader’s psychological type preference and suggested that the passages of scripture proposed for the Feast of Christ the King may be a joy for intuitive thinking types, but a nightmare for sensing feeling types.Contribution: Situated within the reader perspective approach to biblical hermeneutics, the SIFT method is concerned with identifying the influence of the psychological type of the reader in shaping the interpretation of text. Employing this method, the present study contributes to the fields of homiletics and hermeneutics by demonstrating how some readers may struggle more than others to interpret the scripture readings proposed by the lectionary for the Feast of Christ the King. (shrink)

M. Oaksford and N. Chater presented a Bayesian analysis of the Wason selection task in which they proposed that people choose cards in order to maximize expected information gain as measured by reduction in uncertainty in the Shannon-Weaver information theory sense. It is argued that the EIG measure is both psychologically implausible and normatively inadequate as a measure of epistemic utility. The article is also concerned with the descriptive account of findings in the selection task literature offered by Oaksford and (...) Chater. First, it is shown that their analysis data reported in the recent article of K. N. Kirby is unsound; second, an EIG analysis is presented of the experiments of P. Pollard and J. St. B. T. Evans that provides a strong empirical disconfirmation of the theory. (shrink)

The aim of the present research was to develop a difficulty model for logical reasoning problems involving complex ordered arrays used in the Graduate Record Examination. The approach used involved breaking down the problems into their basic cognitive elements such as the complexity of the rules used, the number of mental models required to represent the problem, and question type. Weightings for these different elements were derived from two experimental studies and from the reasoning literature. Based on these weights, difficulty (...) models were developed which were then tested against new data. The models had excellent predictive validity and showed the relative influence of rule based factors and factors relating to the number of underlying models. Different difficulty models were needed for different question types, suggesting that people used a variety of approaches and, at a wider level, that both mental models and mental rules may be used in reasoning. (shrink)

We have been oversold on the base rate fallacy in probabilistic judgment from an empirical, normative, and methodological standpoint. At the empirical level, a thorough examination of the base rate literature (including the famous lawyer–engineer problem) does not support the conventional wisdom that people routinely ignore base rates. Quite the contrary, the literature shows that base rates are almost always used and that their degree of use depends on task structure and representation. Specifically, base rates play a relatively larger role (...) in tasks where base rates are implicitly learned or can be represented in frequentist terms. Base rates are also used more when they are reliable and relatively more diagnostic than available individuating information. At the normative level, the base rate fallacy should be rejected because few tasks map unambiguously into the narrow framework that is held up as the standard of good decision making. Mechanical applications of Bayes's theorem to identify performance errors are inappropriate when (1) key assumptions of the model are either unchecked or grossly violated, and (2) no attempt is made to identify the decision maker's goals, values, and task assumptions. Methodologically, the current approach is criticized for its failure to consider how the ambiguous, unreliable, and unstable base rates of the real world are and should be used. Where decision makers' assumptions and goals vary, and where performance criteria are complex, the traditional Bayesian standard is insufficient. Even where predictive accuracy is the goal in commonly defined problems, there may be situations (e.g., informationally redundant environments) in which base rates can be ignored with impunity. A more ecologically valid research program is called for. This program should emphasize the development of prescriptive theory in rich, realistic decision environments. (shrink)

In this 2001 book Jonathan Price attempts to demonstrate that Thucydides consciously viewed and presented the Peloponnesian War in terms of a condition of civil strife - stasis, in Greek. Thucydides defines stasis as a set of symptoms indicating an internal disturbance in both individuals and states. This diagnostic method, in contrast to all other approaches in antiquity, allows an observer to identify stasis even when the combatants do not or cannot openly acknowledge the nature of their conflict. The (...) words and actions which Thucydides chooses for his narrative meet his criteria for stasis: the speeches in the History represent the breakdown of language and communication characteristic of internal conflict, and the zeal for victory led to acts of unusual brutality and cruelty, and overall disregard for genuinely Hellenic customs, codes of morality and civic loyalty. Viewing the Peloponnesian War as a destructive internal war had profound consequences for Thucydides' historical vision. (shrink)

A groundbreaking collection of contemporary essays from leading international scholars that provides a balanced and expert account of the resurgent debate about substance dualism and its physicalist alternatives. Substance dualism has for some time been dismissed as an archaic and defeated position in philosophy of mind, but in recent years, the topic has experienced a resurgence of scholarly interest and has been restored to contemporary prominence by a growing minority of philosophers prepared to interrogate the core principles upon which past (...) objections and misunderstandings rest. As the first book of its kind to bring together a collection of contemporary writing from top proponents and critics in a pro-contra format, The Blackwell Companion to Substance Dualism captures this ongoing dialogue and sets the stage for rigorous and lively discourse around dualist and physicalist accounts of human persons in philosophy. Chapters explore emergent, Thomistic, Cartesian, and other forms of substance dualism—broadly conceived—in dialogue with leading varieties of physicalism, including animalism, non-reductive physicalism, and constitution theory. Loose, Menuge, and Moreland pair essays from dualist advocates with astute criticism from physicalist opponents and vice versa, highlighting points of contrast for readers in thematic sections while showcasing today’s leading minds engaged in direct debate. Taken together, essays provide nuanced paths of introduction for students, and capture the imagination of professional philosophers looking to expand their understanding of the subject. Skillfully curated and in touch with contemporary science as well as analytic theology, The Blackwell Companion to Substance Dualism strikes a measured balanced between advocacy and criticism, and is a first-rate resource for researchers, scholars, and students of philosophy, theology, and neuroscience. (shrink)

Descartes’ demon is a deceiver: the demon makes things appear to you other than as they really are. However, as Descartes famously pointed out in the Second Meditation, not all knowledge is imperilled by this kind of deception. You still know you are a thinking thing. Perhaps, though, there is a more virulent demon in epistemic hell, one from which none of our knowledge is safe. Jonathan Schaffer thinks so. The “Debasing Demon” he imagines threatens knowledge not via the (...) truth condition on knowledge, but via the basing condition. This demon can cause any belief to seem like it’s held on a good basis, when it’s really held on a bad basis. Several recent critics, Conee, Ballantyne & Evans ) grant Schaffer the possibility of such a debasing demon, and argue that the skeptical conclusion doesn’t follow. By contrast, we argue that on any plausible account of the epistemic basing relation, the “debasing demon” is impossible. Our argument for why this is so gestures, more generally, to the importance of avoiding common traps by embracing mistaken assumptions about what it takes for a belief to be based on a reason. (shrink)

There exists a large body of work examining individual differences in the propensity to engage in reflective thinking processes. However, there is a distinct lack of empirical research examining th...

Substance dualism is compatible not only with Cartesian dualism but also with a number of nonCartesian alternatives, including several varieties of Thomistic dualism, William Hasker's emergent subject dualism, and the holistic anthropology of E. J. Lowe. Due to recent developments within the philosophy of mind, a renewed interest in historical and contemporary theories of the soul, and a more careful evaluation of what does and does not follow from neuroscience, substance dualism is back on the table for a serious critical (...) reevaluation. This chapter reviews the developments in the philosophy of mind and in scholarship on the soul. It shows that substance dualists and their many critics have been brought together by a shared focus on the nature of mental subjects. The chapter also presents an overview of the key concepts discussed in the subsequent chapters of this book. (shrink)

Stephen Davis's detailed assessment of the doctrine of the general resurrection suggests that it is the claim that those who have died will persist into a subsequent, embodied life by means of a divine miracle. The dualist's account of resurrection depends on the possibility that the identity of a person over time is preserved by the persistence of a simple immaterial substance with no necessary connection to a particular physical or psychological career. This chapter argues that the seemingly preposterous simulacrum (...) model fails to offer animalists such as van Inwagen an account of the metaphysical possibility of resurrection. Thus the constitution view of persons is unsuccessful in offering the materialist an account of how an individual might die and yet appear again at the Resurrection. However, while dualist accounts ground personal identity in the persistence of a simple immaterial substance (a soul), the uninformativeness of the constitution view has a different and problematic source. (shrink)

A recent re-reading of E. F. Schumacher's classic Small is Beautiful: Economics as though People Matter reminded me that while Western socio-economic systems seem to operate on the assumption that the chief end of a human life is to bring glory to the GNP, no religious person–certainly no Christian–can accept either economic theories or economic practices which functionally regard human beings as mere means to materialist ends. Western mission societies have by no means been exempt from the pressure all about (...) them to become numerically bigger, materially richer, and technologically more powerful in response to the highly competitive world of conflicting world views. That this is not only an inappropriate but dangerous trend is the point of this article. (shrink)

In this article, I develop the point that whereas talent is the basis for desert, talent itself is not meritocratically deserved. It is produced by three processes, none of which are meritocratic: talent is unequally distributed by the rigged lottery of birth, talent is defined in ways that favor some traits over others, and the market for talent is manipulated to maximally extract advantages by those who have more of it. To see how, we require a sociological perspective on economic (...) rent. I argue that talent is a major means through which people seek rent in modern-day capitalism. Talent today is what inherited land was to feudal societies; an unchallenged source of symbolic and economic rewards. Whereas God sanctified the aristocracy’s wealth, contemporary privilege is legitimated by meritocracy. Drawing on the work of Gary Becker, Pierre Bourdieu, and Jerome Karabel, I show how rent-seeking in modern societies has come to rely principally on rent-definition and creation. Inequality is produced by the ways in which talent is defined, institutionalized, and sustained by the moral deservingness we attribute to the accomplishments of talents. Consequently, today’s inequalities are as striking as ever, yet harder to challenge than ever before. (shrink)

In Before Virtue, Jonathan Sanford develops strategies for describing contemporary virtue ethics accurately. He then assesses contemporary virtue approaches by the Anscombean dual standard which inspired them.

In QED, an external electromagnetic field can be accounted for non-perturbatively by replacing the causal propagators used in Feynman diagram calculations with Green’s functions for the Dirac equation under the external field. If the external field destabilises the vacuum, then it is a difficult problem to determine which Green’s function is appropriate, and multiple approaches have been developed in the literature whose equivalence, in many cases, is not clear. In this paper, we demonstrate for a broad class of external fields (...) that includes all that act for a finite time, that four Green’s functions used in the literature are equivalent: Schwinger’s “proper-time” propagator; the “causal propagator” used in the “Bogoliubov transformation” method based on the canonical quantization of the field operator; and two defined using analytic continuation from complexified parameters. To do so, we formulate Schwinger’s “proper-time quantum mechanics" as a Schrödinger wave mechanics, and use this to re-derive Schwinger’s expression for the propagator as a statement relating solutions of the inhomogeneous Dirac equation to those of the inhomogeneous “proper-time Dirac equation”. This is done by constructing direct integral spectral decompositions of the Hamiltonians of both equations, and deriving a form for solutions of the inhomogeneous Dirac equation in terms of these decompositions. We then show that all four propagators return solutions of the inhomogeneous Dirac equation that satisfy the same boundary condition, which under a physically reasonable assumption is sufficient to specify the solution uniquely. (shrink)

Whether or not it is coherent to place hope in a future life beyond the grave has become a central question in the larger debate about whether a materialist view of human persons can accommodate Christian belief. Hud Hudson defends a four-dimensional account of resurrection in order to avoid persistent difficulties experienced by three-dimensionalist animalism. I present two difficulties unique to Hudson’s view. The first problem of counterpart hope is a manifestation of a general weakness of four-dimensional views to accommodate (...) adequately prudential concern about one’s future self. More significantly, the second problem of quasi hope demonstrates that even if a temporal parts view can accommodate the possibility of future resurrection it necessarily leaves human beings in the dark about their individual futures and thus incapable of hope. I conclude that whatever its merits in demonstrating the possibility of resurrection, four-dimensionalist materialism cannot accommodate veridical Christian hope. (shrink)

I agree with Gibbs that the message of the base rate literature reads differently depending on which null hypothesis is used to frame the issue. But I argue that the normative null hypothesis, H0: “People use base rates in a Bayesian manner,” is no longer appropriate. I also challenge Adler's distinction between unused and ignored base rates, and criticize Goodie's reluctance to shift research attention to the field. Macchi's arguments about textual ambiguities in traditional base rate problems suggest that empirical (...) testing is needed to tease apart the effects of problem clarification and problem framing. Macdonald's, Fletcher's and Snow's skepticism about the value of Bayesian methods in real world judgment tasks is treated as a challenge for the next generation of empirical base rate studies. (shrink)

We accept Sunstein's claim that people often use moral heuristics to make judgments and decisions. However, in situations that include a risk of betrayal, we disagree with Sunstein about when the relevant moral heuristic may be said to “misfire.” We suggest that the moral heuristic people apply to avoid the possibility of safety-product betrayal may be reasonable.

Commentators agree that simple conclusions about a general base rate fallacy are not appropriate. It is more constructive to identify conditions under which base rates are differentially weighted. Commentators also agree that improving the ecological validity of the research is desirable, although this is less important to those interested exclusively in psychological processes. The philosophers and ecologists among the commentators offer a kinder perspective on base rate reasoning than the psychologists. My own perspective is that the interesting questions (both psychological (...) and normative/prescriptive) are best answered through empirical studies that use real-world performance standards. (shrink)

There are four features to Aristotle’s account of courage that appear peculiar when compared to our own intuitions about this virtue: (1) his account of courage seems not, on its surface, to fit a eudaimonist model, (2) courage is restricted to a surprisingly small number of actions, (3) this restriction, among other things, excludes women and non-combatant men from ever exercising this virtue, and (4) courage is counted as virtuous because of its nobility and beauty. In this paper I explore (...) Aristotle’s account of courage while being attentive to these features, and conclude with a brief consideration of how one might, without ignoring the peculiarities of his own treatment, apply Aristotle’s account of courage to a wider range of actions and actors than he would allow by employing analogoussenses of the terms “life” and “death.”. (shrink)

The notion that evil is not simply a privation but a privation of a due good has roots in Aristotle’s Metaphysics and implications for other areas of his thought. In making this case, I begin with a description of the standard view of Aristotle’s place in the development of the privation theory of evil and contend that the standard view does not do justice to Aristotle’s theory of evil. I then provide an interpretation of a portion of Metaphysics Theta that (...) utilizes recent scholarship on this book of the Metaphysics in an effort to demonstrate that Aristotle thinks of evil in such a manner as to be compatible with what the later tradition describes in terms of evil as the deprivation of a due good. I then consider several of the ways in which Aristotle’s metaphysical theory of evil has impact on other areas of his thought. (shrink)

In light of truths expressed by Thomas Aquinas and in lawyers’ oaths, lawyers sworn to uphold the civil law must work toward the goal of teaching and gradually encouraging citizens to have the inner virtues that would make civil law itself irrelevant. This follows from claims central to the civic and the Catholic intellectual traditions: the civil law is a teacher, its effect ought to be the promotion of virtue, and virtuous living is constitutive of the common good. Natural law (...) undergirds and gives substance to the civil law, which nonetheless should only demand under fear of punishment what is followable for the majority of men, given the needs of good public order and the habits and customs of their country. (shrink)

Lynne Rudder Baker’s work was driven by commitments to quasi-naturalist materialism and the ontological distinctiveness of human persons. The incompatibility of these commitments is apparent in her constitution view. Baker's “Not-so-simple Simple View” of personal identity is inferior to the Simple View traditionally associated with substance dualism since CV’s underlying account of persons is vacuous. It also entails a dilemma: either indeterminate identity or the problem of the many. Finally, CV also fails to support Baker’s view that human persons do (...) not begin to exist prior to the acquisition of a capacity for conscious, intentional thought. (shrink)

IPCC SPECIAL REPORT ON CLIMATE CHANGE AND LAND (SRCCL) -/- Chapter 3: Climate Change and Land: An IPCC special report on climate change, desertification, land degradation, sustainable land management, food security, and greenhouse gas fluxes in terrestrial ecosystems.