The core dimensions of cognitive fitness, such as attention and cognitive control, are emerging through a transdisciplinary expert consensus on what has been termed the Cognitive Fitness Framework. These dimensions represent key drivers of cognitive performance under pressure across many occupations, from first responders to sport, performing arts and the military. The constructs forming the building blocks of CF2 come from the RDoC framework, an initiative of the US National Institute of Mental Health aimed at identifying the cognitive processes underlying (...) normal and abnormal behavior. Similar to physical conditioning, cognitive fitness can be improved with deliberate practice. This paper reports the development of a prototype cognitive fitness training program for competitive athletes and the protocol for its evaluation. The program is focused on primary cognitive capacities and subtending skills for adjusting training rhythms and enhancing readiness for competition. The project is driven by the Australian Psychological Society’s College of Sport & Exercise Psychology and includes the development of a Cognitive Gym program for a smartphone app-enhanced implementation. Its key building blocks are training protocols connected by a periodized training plan. A website with background supporting resources has also been developed as part of the project. National-level training squads will participate in a three-week pilot evaluation protocol, assessing the program’s efficacy and usability through gamified cognitive assessment of participants’ training gains and coaching staff evaluations, respectively. Both near and far transfer of training effects will be examined. (shrink)

“Pragmatic encroachers” about knowledge generally advocate two ideas: (1) you can rationally act on what you know; (2) knowledge is harder to achieve when more is at stake. Charity Anderson and John Hawthorne have recently argued that these two ideas may not fit together so well. I extend their argument by working out what “high stakes” would have to mean for the two ideas to line up, using decision theory.

This paper is about the statics and dynamics of belief states that are represented by pairs consisting of an agent's credences (represented by a subjective probability measure) and her categorical beliefs (represented by a set of possible worlds). Regarding the static side, we argue that the latter proposition should be coherent with respect to the probability measure and that its probability should reach a certain threshold value. On the dynamic side, we advocate Jeffrey conditionalisation as the principal mode of (...) changing one's belief state. This updating method fits the idea of the Lockean Thesis better than plain Bayesian conditionalisation, and it affords a flexible method for adding and withdrawing categorical beliefs. We show that it fails to satisfy the traditional principles of Inclusion and Preservation for belief revision and the principle of Recovery for belief withdrawals{, as well as the Levi and Harper identities. We take this to be a problem for the latter principles rather than for the idea of coherent belief change. (shrink)

In his commentary on theTimaeus, the Neoplatonist Iamblichus argues that time is logically antecedent to change inasmuch as time is no mere aspect of change. Naturally, scholars appraise this thesis in light of Neoplatonic metaphysics. Nevertheless, they neglect the philological framing of this thesis, and thence the philosophical implications thereof. Only J.M. Dillon acknowledges this framing, though even Dillon does not acknowledge the philosophical implications thereof. This article illustrates the logic of said thesis vis-à-vis the Iamblichean exegesis ofTi. 38b7–c1 (Iambl.apudSimpl.in (...) Phys.1.794.21–7 Diels, Iambl.in Ti. fr. 67 Dillon). Beginning from the intuition that time is no mere aspect of change, Iamblichus argues that time can persist apart from change, and thereupon, given the Platonic notion that time is the everlasting image of Eternityquaparadigm, Iamblichus intuits that time is no mere image but everlasting in its own right, being itself a paradigm. Yet this thesis rests upon the indeterminateness of the Platonic titleτὸ παράδειγμα τῆς διαιωνίας φύσεως(‘the paradigm of a thoroughly everlasting nature’) atTi. 38b8 and, still more so, upon the reflexiveness of the ambiguousΑΥΤΩΙ(that is,αὐτῷ‘toit[the paradigm]’, if notαὑτῷ‘toitself[as paradigm]’) atTi. 38c1. Inasmuch as the subject of the Platonic title is indeterminate between Eternity and Eternal Beingquaintelligible everlastingness, Iamblichus construesΑΥΤΩΙnot as a mere reflexive but as self-reflexive, withαὑτῷreferring to Timequaintelligible paradigm. In this light, the Platonic lemma grounds the Iamblichean thesis. (shrink)

Over the past 25 years, no religious institution in America has done more to explore the link between the environment and spirituality than the Cathedral of St. John the Divine. Now, for the first time, a selection of the finest of the Cathedral's ecological sermons appears in a single volume.

Deep neural networks (DNNs) have had extraordinary successes in classifying photographic images of objects and are often described as the best models of biological vision. This conclusion is largely based on three sets of findings: (1) DNNs are more accurate than any other model in classifying images taken from various datasets, (2) DNNs do the best job in predicting the pattern of human errors in classifying objects taken from various behavioral datasets, and (3) DNNs do the best job in predicting (...) brain signals in response to images taken from various brain datasets (e.g., single cell responses or fMRI data). However, these behavioral and brain datasets do not test hypotheses regarding what features are contributing to good predictions and we show that the predictions may be mediated by DNNs that share little overlap with biological vision. More problematically, we show that DNNs account for almost no results from psychological research. This contradicts the common claim that DNNs are good, let alone the best, models of human object recognition. We argue that theorists interested in developing biologically plausible models of human vision need to direct their attention to explaining psychological findings. More generally, theorists need to build models that explain the results of experiments that manipulate independent variables designed to test hypotheses rather than compete on making the best predictions. We conclude by briefly summarizing various promising modeling approaches that focus on psychological data. (shrink)

How should a group with different opinions (but the same values) make decisions? In a Bayesian setting, the natural question is how to aggregate credences: how to use a single credence function to naturally represent a collection of different credence functions. An extension of the standard Dutch-book arguments that apply to individual decision-makers recommends that group credences should be updated by conditionalization. This imposes a constraint on what aggregation rules can be like. Taking conditionalization as a basic constraint, we gather (...) lessons from the established work on credence aggregation, and extend this work with two new impossibility results. We then explore contrasting features of two kinds of rules that satisfy the constraints we articulate: one kind uses fixed prior credences, and the other uses geometric averaging, as opposed to arithmetic averaging. We also prove a new characterisation result for geometric averaging. Finally we consider applications to neighboring philosophical issues, including the epistemology of disagreement. (shrink)

Famous results by David Lewis show that plausible-sounding constraints on the probabilities of conditionals or evaluative claims lead to unacceptable results, by standard probabilistic reasoning. Existing presentations of these results rely on stronger assumptions than they really need. When we strip these arguments down to a minimal core, we can see both how certain replies miss the mark, and also how to devise parallel arguments for other domains, including epistemic “might,” probability claims, claims about comparative value, and so on. A (...) popular reply to Lewis's results is to claim that conditional claims, or claims about subjective value, lack truth conditions. For this strategy to have a chance of success, it needs to give up basic structural principles about how epistemic states can be updated—in a way that is strikingly parallel to the commitments of the project of dynamic semantics. (shrink)

“There are no gaps in logical space,” David Lewis writes, giving voice to sentiment shared by many philosophers. But different natural ways of trying to make this sentiment precise turn out to conflict with one another. One is a *pattern* idea: “Any pattern of instantiation is metaphysically possible.” Another is a *cut and paste* idea: “For any objects in any worlds, there exists a world that contains any number of duplicates of all of those objects.” We use resources from model (...) theory to show the inconsistency of certain packages of combinatorial principles and the consistency of others. (shrink)

We explore psychological contracts as mechanisms by which individuals gain influence in organizations. Using two distinct research settings and longitudinal analysis, we demonstrate that ideological contracts endow individuals with increased centrality in the organization’s influence network. More generally, we propose that an important outcome of different psychological contract types may be how they affect the nature of influence in organizations.

Computability and Logic has become a classic because of its accessibility to students without a mathematical background and because it covers not simply the staple topics of an intermediate logic course, such as Godel's incompleteness theorems, but also a large number of optional topics, from Turing's theory of computability to Ramsey's theorem. This 2007 fifth edition has been thoroughly revised by John Burgess. Including a selection of exercises, adjusted for this edition, at the end of each chapter, it offers (...) a simpler treatment of the representability of recursive functions, a traditional stumbling block for students on the way to the Godel incompleteness theorems. This updated edition is also accompanied by a website as well as an instructor's manual. (shrink)

A couple may have a child to provide stem cells for another child. They may also use preimplantation testing—even, troubling though it is, prenatal testing and selective abortion—to ensure a close tissue match.

This fourth edition of one of the classic logic textbooks has been thoroughly revised by John Burgess. The aim is to increase the pedagogical value of the book for the core market of students of philosophy and for students of mathematics and computer science as well. This book has become a classic because of its accessibility to students without a mathematical background, and because it covers not simply the staple topics of an intermediate logic course such as Godel's Incompleteness (...) Theorems, but also a large number of optional topics from Turing's theory of computability to Ramsey's theorem. John Burgess has now enhanced the book by adding a selection of problems at the end of each chapter, and by reorganising and rewriting chapters to make them more independent of each other and thus to increase the range of options available to instructors as to what to cover and what to defer. (shrink)

On several key issues we agree with the commentators. Perhaps most importantly, everyone seems to agree that psychology has an important role to play in building better models of human vision, and (most) everyone agrees (including us) that deep neural networks (DNNs) will play an important role in modelling human vision going forward. But there are also disagreements about what models are for, how DNN–human correspondences should be evaluated, the value of alternative modelling approaches, and impact of marketing hype in (...) the literature. In our view, these latter issues are contributing to many unjustified claims regarding DNN–human correspondences in vision and other domains of cognition. We explore all these issues in this response. (shrink)

This book offers an introduction to the thought of Robert Holcot, a great and influential but often underappreciated medieval thinker. Holcot was a Dominican friar who flourished in the 1330's and produced a diverse body of work including scholastic treatises, biblical commentaries, and sermons. By viewing the whole of Holcot's corpus, John T. Slotemaker and Jeffrey C. Witt provide a comprehensive account of his thought. Challenging established characterizations of him as a skeptic or radical, they show Holcot to (...) be primarily concerned with affirming and supporting the faith of the pious believer. At times, this manifests itself as a cautious attitude toward absolutist claims about the power of natural reason. At other times Holcot reaffirms, in Anselmian fashion, the importance of rational effort in the attempt to understand and live out one's faith. Over the course of this introduction the authors unpack Holcot's views on faith and heresy, the divine nature and divine foreknowledge, the sacraments, Christ, and political philosophy. They also examine Holcot's approach to several important medieval literary genres, including the development of his unique. (shrink)

In contrast to the views put forth by Stein & Glasier, we support the use of inbred strains of rodents in studies of the immunobiology of neural transplants. Inbred strains demonstrate homology of the major histocompatibility complex (MHC). Virtually all experimental work in transplantation immunology is performed using inbred strains, yet very few published studies of immune rejection in intracerebral grafts have used inbred animals.

Here we present and develop the hypothesis that the derepression of endogenous retrotransposable elements (RTEs) – “genomic parasites” – is an important and hitherto under‐unexplored molecular aging process that can potentially occur in most tissues. We further envision that the activation and continued presence of retrotransposition contribute to age‐associated tissue degeneration and pathology. Chromatin is a complex and dynamic structure that needs to be maintained in a functional state throughout our lifetime. Studies of diverse species have revealed that chromatin undergoes (...) extensive rearrangements during aging. Cellular senescence, an important component of mammalian aging, has recently been associated with decreased heterochromatinization of normally silenced regions of the genome. These changes lead to the expression of RTEs, culminating in their transposition. RTEs are common in all kingdoms of life, and comprise close to 50% of mammalian genomes. They are tightly controlled, as their activity is highly destabilizing and mutagenic to their resident genomes. (shrink)

The use of neural transplantation to alleviate cognitive deficits is still in its infancy. We have an inadequate understanding of the deficits induced by different types of brain damage and their homologies in animal models against which to assess graft-induced recovery, and of the ways in which graft growth and function are influenced by factors within the host brain and the environment in which the host is operating. Further, use of fetal tissue may only be a transitory phase in the (...) search for appropriate donor sources. Nevertheless, findings from our laboratory and elsewhere have made a prima facie case for successful cognitive reconstruction by graft methods. (shrink)

Cognitive deficits were produced in rats by different methods of damaging the brain: chronic ingestion of alcohol, causing widespread damage to diffuse cholinergic and aminergic projection systems; lesions (by local injection of the excitotoxins, ibotenate, quisqualate, and AMPA) of the nuclei of origin of the forebrain cholinergic projection system (FCPS), which innervates the neocortex and hippocampal formation; transient cerebral ischaemia, producing focal damage especially in the CA1 pyramidal cells of the dorsal hippocampus; and lesions (by local injection of the neurotoxin, (...) colchicine) of the granule cells of the dentate gyrus. Following chronic alcohol or lesions of the FCPS, transplants of cholinergically rich fetal brain tissue into the terminal areas (neocortex and/or hippocampus) restored performance almost to control levels, with a time course consistent with growth of the transplants and integration with host tissue; transplants of cholinergically poor fetal tissue (hippocampus) were without effect, as were transplants of cholinergically rich tissue into the region containing the nuclei of origin of the FCPS. Grafts of primary cells enriched in glia and cultured neuroblastoma cells into the terminal areas of the FCPS were equally effective, suggesting that there are multiple mechanisms by which neural transplants can restore cognitive function following diffuse cholinergic damage. In contrast, after ischaemia- or neurotoxin-induced damage to CA1 or dentate granule cells respectively, cholinergically rich fetal transplants into the damaged hippocampal formation were ineffective in restoring performance. After ischaemic damage, however, performance was restored by suspension grafts of CA1 cells but not by transplants containing CA3 pyramidal cells or granule cells; and after colchicine damage it was restored by solid grafts containing granule but not CA1 pyramidal cells. Furthermore, electrophysiological evidence has demonstrated functional, graft type-specific host-graft functional neuronal connectivity. Thus, restoration of cognitive function by neural transplants is possible after damage to either diffuse (cholinergic) or point-to-point (intrahippocampal) forebrain systems, but the transplant must be appropriate to the damage to be repaired. Because the different types of brain damage studied provide analogues of human alcoholic dementia, Alzheimer's disease, and heart attack, these results are encouraging with regard to the eventual application of neural transplant surgery to the treatment of cognitive deficits in humans. (shrink)

Kant’s theory is especially instructive because he was logically more acute than many of his successors; and his awareness of the difficulties of his position was correspondingly higher. This leads him to a rich and complex theory of aesthetic appreciation which, because of the inherent difficulties in stating an internalist position, has its share of the ambiguities. Kant’s overall framework is so clear, however, that we shall go into some of the crucial ambiguities and argue against his theory under the (...) various resulting interpretations since these seem nearly exhaustive of the possible internalist positions. Ever since Kant presented his theory as overcoming the logical and skeptical difficulties of aesthetics, his position has left us with the myth that an internalist account of aesthetic appreciation and evaluation is philosophically defensible. This myth has been believed by too many theorists of art and aesthetics. One could argue, for example, that the expression theory of art is the progeny of, and dependent upon, Kant’s myth. Obviously then, it is important to re-examine the logic of Kant’s position, for a good bit of subsequent theorizing has been built on the same foundation, though without the care displayed by Kant. Hopefully, some of our arguments against Kant will be equally applicable to Kant’s progeny; therefore, we sometimes consider more than one interpretation of what view Kant might be holding. Our aim is not so much to arrive at the "correct" interpretation of Kant himself as it is to explore the logic of the internalist position. (shrink)

This essay is the journal editor's introduction to part 3 of an ongoing symposium on quietism. With reference to writings of James Joyce, Francis Picabia, J. M. Coetzee, Charles Taylor, Alasdair MacIntyre, Elaine Pagels, and Karen King—and with extended reference to Jonathan Lear's study of “cultural devastation,” Radical Hope—Jeffrey Perl explores the possibility that the fear of anomie is misplaced. He argues that, in comparison with the violence and narrowness of any given social order, anomie may well be preferable, (...) and, in any case, may be no more than another name for quietism. (shrink)

This essay is the journal editor's introduction to part 3 of an ongoing symposium on quietism. With reference to writings of James Joyce, Francis Picabia, J. M. Coetzee, Charles Taylor, Alasdair MacIntyre, Elaine Pagels, and Karen King—and with extended reference to Jonathan Lear's study of “cultural devastation,” Radical Hope—Jeffrey Perl explores the possibility that the fear of anomie (“anomiphobia”) is misplaced. He argues that, in comparison with the violence and narrowness of any given social order, anomie may well be (...) preferable, and, in any case, may be no more than another name for quietism. (shrink)

Current research suggests that nonclinical forensic psychologists[sup1] are appearing increasingly more often in the legal arena. We argue that many of the ethical dilemmas that face these psychologists differ from those encountered by clinical forensic psychologists. To test the accuracy of this assertion, 37 nonclinical forensic psychologists were surveyed to identify some of the ethical issues and dilemmas they have encountered while engaging in expert testimony or pretrial consulting. Respondents were asked also about how they have resolved these ethical issues (...) and whether they were aware of the "Specialty Guidelines for Forensic Psychologists" (Committee on Ethical Guidelines for Forensic Psychologists, 1991). Results of the survey are discussed in terms of the need for additional regulatory guidelines or professional standards that speak directly to the ethical issues confronting nonclinical, forensic expert witnesses and consultants. (shrink)

Emerging research shows a strong connection between brain areas governing cognition and motor behavior. Yet, research investigating the negative aftereffects of cognitive control exertion on task performance has not considered the potential role of areas governing motor behavior. The present study investigated the effects of high cognitive control exertion on task self-efficacy and exercise performance in children. A secondary purpose was to investigate whether motor coordination influences the change in exercise performance differently following low versus high cognitive control exertion. Participants (...) (N = 70) performed two isometric handgrip endurance trials separated by a Stroop task, which was either congruent (low cognitive control) or incongruent (high cognitive control). Motor coordination was assessed prior to the first endurance trial. Task self-efficacy for performing the second endurance trial was assessed following the Stroop task. Participants in the high cognitive control condition reported lower task self-efficacy and showed a reduction in endurance exercise performance. Task self-efficacy mediated the cognitive control – performance relationship. Participants scoring lower on motor coordination showed the greatest declines in exercise performance following high cognitive control, whereas motor coordination did not affect performance following low cognitive control. The results of this study provide evidence that task self-efficacy and exercise performance are also negatively affected in children following high cognitive control, and interestingly, these effects are exacerbated among those scoring lower in motor coordination. We recommend future research investigate motor coordination as a potential mechanism for the reductions in both cognitive and physical task performance following the prolonged exertion of high cognitive control. (shrink)