Do psychological traits predict philosophical views? We administered the PhilPapers Survey, created by David Bourget and David Chalmers, which consists of 30 views on central philosophical topics (e.g., epistemology, ethics, metaphysics, philosophy of mind, and philosophy of language) to a sample of professional philosophers (N = 314). We extended the PhilPapers survey to measure a number of psychological traits, such as personality, numeracy, well-being, lifestyle, and life experiences. We also included non-technical ‘translations’ of these views for eventual use in other (...) populations. We found limited to no support for the notion that personality or demographics predict philosophical views. We did, however, find that some psychological traits were predictive of philosophical views, even after strict correction for multiple comparisons. Findings include: higher interest in numeracy predicted physicalism, naturalism, and consequentialism; lower levels of well-being and higher levels of mental illness predicted hard determinism; using substances such as psychedelics and marijuana predicted non-realist and subjectivist views of morality and aesthetics; having had a transformative or self-transcendent experience predicted theism and idealism. We discuss whether or not these empirical results have philosophical implications, while noting that 68% of our sample of professional philosophers indicated that such findings would indeed have philosophical value. (shrink)

In the nearly 30 years since Premack and Woodruff famously asked, “Does the chimpanzee have a theory of mind?”, the question of exactly how much non‐human primates understand about the mental lives of others has had an unusually dramatic history. As little as ten years ago it appeared that the answer would be a simple one, with early investigations of non‐human primates’ mentalistic abilities yielding a steady stream of negative findings. Indeed, by the mid‐1990s even very cautious researchers were ready (...) to flatly assert that Theory of Mind was a uniquely human capacity. Recently, however, an exciting new theoretical perspective on primate social cognition has arisen, and with it the distinct possibility that our evolutionary relatives may understand far more of the social world than we previously believed. In this paper we review new theory and evidence suggesting that non‐human primates may indeed represent the mental states of others, at least within the domains for which their distinctive social ecology has prepared them. Having asserted that Premack and Woodruff's original question can be answered with a qualified yes, we then consider the new questions that arise in its place, particularly how and why our own Theory of Mind became more domain‐general than that of other primates. (shrink)

The completion of the chimpanzee genome will greatly help us determine which genetic changes are unique to humanity. Chimpanzees are our closest living relative, and a recent study has made considerable progress towards decoding the genome of our sister taxon.1 Over 75,000 common chimpanzee (Pan troglodytes) bacterial artificial chromosome end sequences were aligned and mapped to the human genome. This study shows the remarkable genetic similarity (98.77%) between humans and chimpanzees, while highlighting intriguing areas of potential difference. If we wish (...) to understand the genetic basis of humankind, the completion of the chimpanzee genome deserves high priority. BioEssays 24:490–493, 2002. © 2002 Wiley Periodicals, Inc. (shrink)

The discovery of traces of a blood meal in the abdomen of a 50‐million‐year‐old mosquito reminds us of the insights that the chemistry of fossils can provide. Ancient DNA is the best known fossil molecule. It is less well known that new fossil targets and a growing database of ancient gene sequences are paralleled by discoveries on other classes of organic molecules. New analytical tools, such as the synchrotron, reveal traces of the original composition of arthropod cuticles that are more (...) than 400 my old. Pigments such as melanin are readily fossilized, surviving virtually unaltered for ∼200 my. Other biomarkers provide evidence of microbial processes in ancient sediments, and have been used to reveal the presence of demosponges, for example, more than 635 mya, long before their spicules appear in the fossil record. Ancient biomolecules are a powerful complement to fossil remains in revealing the history of life. (shrink)

Carpendale & Lewis contend that correlations between sociolinguistic factors and theory-of-mind performance indicate that social knowledge develops from social interactive processes. However, theory-theory proponents also regard these correlations as compatible with their view of how mental concepts develop. A more fruitful distinction lies in the differences of both accounts in explaining how mental concepts acquire meaning.

Tomasello et al. provide a new account of cultural uniqueness, one that hinges on a uniquely human motivation to share intentionality with others. We favor an alternative to this motivational account – one that relies on a modular explanation of the primate intention-reading system. We discuss this view in light of recent comparative experiments using competitive intention-reading tasks.

This edited book addresses four themes of contemporary importance in the experimental and applied analysis of behaviour: chronobiology (relationships between time and behaviour), the emergence of rational thinking, language, and behavioural medicine. The current empirical and theoretical status of each theme is considered in individual chapters, the authors of which are distinguished research scientists drawn from a wide range of scholarship and with a distinctive European dimension. This cultural and theoretical diversity emerges from the fact that each chapter is developed (...) from a paper originally presented by invitation at the Second European Meeting on the Experimental Analysis of Behaviour, which was held in Liège, Belgium in 1988. Within the four themes, individual topics address issues such as circadian rhythms in behaviour, temporal regulation in children and in animals, the emergence of equivalence relations in children and animals, the development of thinking in mentally retarded children, reasoning and associative learning in animals, rule'governed behaviour, theoretical issues relating language to the theory of mind, the relationship between behavioural and visceral functions, the relevance of behavioural approaches to the prevention of AIDS, and the development of self'detection skills for breast cancer. The book makes an important contribution to the literature of contemporary behaviour analysis by reviewing issues of current interest and importance from a broad theoretical base. (shrink)

This paper briefly surveys several prominent modeling approaches to knowledge-based intelligent systems design and, especially, expert systems and the breakthroughs that have most broadened and improved their applications. We argue that the implementation of technology that aims to emulate rudimentary aspects of human intelligence has enhanced KBIS design, but that weaknesses remain that could be addressed with existing research in cognitive science. For example, we propose that systems based on representational plasticity, functional dynamism, domain specificity, creativity, and concept learning, with (...) their theoretical and experimental rigor, can best characterize the problem-solving capabilities of humans and can best overcome five key limitations currently exhibited by knowledge-based intelligent systems. We begin with a brief survey of the relevant work related to KBIS design and then discuss these five shortcomings with new suggestions for how to integrate results from cognitive science to resolve each of them. Our ultimate goal is to increase awareness and direct attention to areas of theoretical and experimental cognitive research that are fundamentally relevant to the goals underlying KBISes. (shrink)

The sudden appearance in the fossil record of the major animal phyla apparently records a phase of unparalleled, rapid evolution at the base of the Cambrian period, 545 Myr ago. This has become known as the Cambrian evolutionary ‘explosion’, and has fuelled speculation about unique evolutionary processes operating at that time. The acceptance of the palaeontological evidence as a true reflection of the evolutionary narrative has been criticised in two ways: from a reappraisal of the phylogenetic relationships of the early (...) fossils, and from predicitions of molecular divergence times, based on six appropriate metazoan genes. Phylogenetic analysis of the arthropods implies an earlier, Precambrian history for most clades, and hence an extensive period of cladogenesis unrecorded by fossils. A similar argument can be applied to molluscs, lophophorates and deuterostomes. Molecular evidence implies divergence between clades to at least 1000 Myr ago. The apparent paradox between the sudden appearance of recognisable metazoans and their extended evolutionary history might be explained by a sudden Cambrian increase in body size, which was accompanied by skeletisation. A new paradigm suggests that the ‘explosion’ in the record may have been decoupled from the evolutionary innovation. (shrink)

A recent article argued that signals from conventional Raman spectroscopy of organic materials are overwhelmed by edge filter and fluorescence artefacts. The article targeted a subset of Raman spectroscopic investigations of fossil and modern organisms and has implications for the utility of conventional Raman spectroscopy in comparative tissue analytics. The inferences were based on circular reasoning centered around the unconventional analysis of spectra from just two samples, one modern, and one fossil. We validated the disputed signals with in situ Fourier‐Transform (...) Infrared (FT‐IR) Spectroscopy and through replication with different lasers, filters, and operators in independent laboratories. Our Raman system employs a holographic notch filter which is not affected by edge filter or other artefacts. Multiple lines of evidence confirm that conventional Raman spectra of fossils contain biologically and geologically meaningful information. Statistical analyses of large Raman and FT‐IR spectral data sets reveal patterns in fossil composition and yield valuable insights into the history of life. (shrink)

Exceptionally preserved fossils are the product of complex interplays of biological and geological processes including burial, autolysis and microbial decay, authigenic mineralization, diagenesis, metamorphism, and finally weathering and exhumation. Determining which tissues are preserved and how biases affect their preservation pathways is important for interpreting fossils in phylogenetic, ecological, and evolutionary frameworks. Although laboratory decay experiments reveal important aspects of fossilization, applying the results directly to the interpretation of exceptionally preserved fossils may overlook the impact of other key processes that (...) remove or preserve morphological information. Investigations of fossils preserving non-biomineralized tissues suggest that certain structures that are decay resistant are rarely preserved, and decay-prone structures can fossilize, albeit rarely. As we review here, decay resistance is an imperfect indicator of fossilization potential, and a suite of biological and geological processes account for the features preserved in exceptional fossils. Organisms decayed experimentally in seawater have been used as direct analogs for soft-bodied fossil taxa, with fossils representing a snapshot of a particular stage of decay. We argue that numerous geological and biological processes account for fossilization and that all of these should be considered when reconstructing extinct organisms. (shrink)

Exceptionally preserved fossils are the product of complex interplays of biological and geological processes including burial, autolysis and microbial decay, authigenic mineralization, diagenesis, metamorphism, and finally weathering and exhumation. Determining which tissues are preserved and how biases affect their preservation pathways is important for interpreting fossils in phylogenetic, ecological, and evolutionary frameworks. Although laboratory decay experiments reveal important aspects of fossilization, applying the results directly to the interpretation of exceptionally preserved fossils may overlook the impact of other key processes that (...) remove or preserve morphological information. Investigations of fossils preserving non-biomineralized tissues suggest that certain structures that are decay resistant are rarely preserved, and decay-prone structures can fossilize, albeit rarely. As we review here, decay resistance is an imperfect indicator of fossilization potential, and a suite of biological and geological processes account for the features preserved in exceptional fossils. Organisms decayed experimentally in seawater have been used as direct analogs for soft-bodied fossil taxa, with fossils representing a snapshot of a particular stage of decay. We argue that numerous geological and biological processes account for fossilization and that all of these should be considered when reconstructing extinct organisms. (shrink)

In the nearly 30 years since Premack and Woodruff famously asked, “Does the chimpanzee have a theory of mind?”, the question of exactly how much non-human primates understand about the mental lives of others has had an unusually dramatic history. As little as ten years ago it appeared that the answer would be a simple one, with early investigations of non-human primates’ mentalistic abilities yielding a steady stream of negative findings. Indeed, by the mid-1990s even very cautious researchers were ready (...) to flatly assert that Theory of Mind was a uniquely human capacity. Recently, however, an exciting new theoretical perspective on primate social cognition has arisen, and with it the distinct possibility that our evolutionary relatives may understand far more of the social world than we previously believed. In this paper we review new theory and evidence suggesting that non-human primates may indeed represent the mental states of others, at least within the domains for which their distinctive social ecology has prepared them. Having asserted that Premack and Woodruff's original question can be answered with a qualified yes, we then consider the new questions that arise in its place, particularly how and why our own Theory of Mind became more domain-general than that of other primates. (shrink)

Research on children's theory of mind often restricts conceptually meaningful talk about knowledge to instances where know references a corresponding mental state. This article offers a reappraisal of that view. From a social-pragmatic perspective, even nonreferential talk is meaningful when appropriately embedded in social routines. A synthesis of corpus data suggests children's early talk about knowledge routinely occurs in question–answer contexts. It is argued that the influence of interrogative contexts is evident in children's over-attributions of knowledge when someone is only (...) guessing. This influence is taken as evidence for the role of linguistic practices in shaping the concept of knowledge. (shrink)

A critical edition of the correspondence between Astell and John Norris of Bemerton, which had a profound significance in 18th-century intellectual and religious circles and which represents a crucial step in the development of Norris and Astell's opposition to John Locke.

Progress in the “theory of mind” debate would be better served at this point by abandoning the search for a perfect “critical experiment” and developing an incremental research program based on a systematic theory of “theory of mind.” Studies using the goggle procedure advocated by Heyes should dissociate the ability to see from possible behavioral artifacts of “blind” trainers.

This textbook reflects the buoyant state of contemporary political philosophy, and the development of the subject in the past two decades. It includes seminal papers on fundamental philosophical issues such as: the nature of social explanation distributive justice liberalism and communitarianism citizenship and multiculturalism nationalism democracy criminal justice. A range of views is represented, demonstrating the richness of the philosophical contribution to some of the most contested areas of public policy and political decision making. Each section has an introduction by (...) the editors that situates the papers in the ongoing debate. Further Reading sections feature at the end of each chapter. Readings from the following thinkers are included: Steven Lukes, Robert Nozick, John Rawls, Bhikhu Parekh, Antony Duff, G.A. Cohen, Derek Parfit, Roger Scruton, Michael Sandel, Alasdair MacIntrye. _Debates in Contemporary Political Philosophy_ will be a valuable resource for upper-level students interested in current thinking in this area. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Journal of the History of Ideas 62.3 (2001) 505-522 [Access article in PDF] Mary Astell's Ironic Assault on John Locke's Theory of Thinking Matter E. Derek Taylor Mary Astell (1666-1731), most famous today for her call for the establishment of Protestant nunneries in Serious Proposal to the Ladies, Part I (1694) and for her acute Reflections Upon Marriage (1700), has lurked for years at the edges of that (...) infinitely contentious category "feminism," but she is only now beginning to receive her rightful inheritance as a theological and philosophical thinker, probably the title she would most have preferred. 1 This is not to say that Astell's Christian-Platonism has been ignored. In her 1986 biography Ruth Perry gave cogent expression to the centrality of Astell's idealist Christianity to all aspects of her thought 2 and in the same year, Bridget Hill thoughtfully warned her readers against attempting to force Astell, a religious conservative, "into some preconceived idea of what late seventeenth and early eighteenth century feminism ought to have been." 3 More recently, Patricia Springborg has written two significant essays that rely in part on Astell's more neglected theological-philosophical works, Letters concerning the Love of God (1695), a collection of Astell's correspondence with John Norris of Bemerton (1657-1711), and The Christian Religion, As Professed by a Daughter of the Church of England (1705; 3d edition 1730), far and away her most developed theological-philosophical [End Page 505] statement. 4 Despite these important forays, however, both Letters and Christian Religion continue to be largely ignored, as is suggested by the relative dearth of scholarly work on either text and the short shrift each receives in anthologies of Astell's works. 5 Despite the great popularity of Letters throughout the eighteenth century and despite the fact that, as Springborg points out, Astell considered Christian Religion "her magnum opus," neither text has found new life in a modern edition. 6This omission creates a rather vexing problem for would-be scholars of Astell's philosophical and theological ideas. The major primary texts themselves not being available, we have little choice but to rely on the limited accounts of other scholars for our information. Over a decade ago, for instance, The Journal of the History of Philosophy published a long note by Kathleen M. Squadrito on "Mary Astell's Critique of John Locke's View of Thinking Matter," and hers has since been the standard (if not quite only) account of this historically fascinating and important philosophical comment in Christian Religion.7 Squadrito wants, she writes, to "present a short account of [Astell's] work and her criticism of Locke's view of thinking matter." 8 Unfortunately, Squadrito's account of Astell's "work" is significantly flawed, which leads her to serious mischaracterizations of Astell's "criticism" of Locke's hypothesis. Briefly put, Astell's "own philosophy" in Christian Religion does not, as Squadrito claims, emerge "as an attempted reconciliation of the views of Norris and Locke" 9 ; because she supposes it does, however, Squadrito is able to present Astell's critique of Locke's theory [End Page 506] of thinking matter as a respectful, even-handed philosophical analysis, a theoretical bridge, as it were, between the Platonism of Norris and the Empiricism of Locke. As we shall see, Astell's critique of Locke's hypothesis actually amounts to a bitterly ironic assault, wherein Astell does not so much build bridges as burn them. Just why Astell in Christian Religion decided not to strike a middling position between Locke and Norris, and how this decision invigorated her attack on Locke's materialist hypothesis, are the primary questions this essay seeks to answer. In order to arrive at such answers, however, it is necessary first to examine the text in which Astell does attempt to carve out a position between Locke and Norris, namely Astell and Norris's Letters.The basic history of Letters is well enough understood. Mary Astell, a well-read young woman of significant perspicacity, first wrote in... (shrink)

We are big fans of propositions. But we are not big fans of the proposed by Mitchell et al. The authors ignore the critical role played by implicit, non-inferential processes in biological cognition, overestimate the work that propositions alone can do, and gloss over substantial differences in how different kinds of animals and different kinds of cognitive processes approximate propositional representations.

Editor's suggested further reading in BioEssaysA new paradigm in cell therapy for diabetes: Turning pancreatic α‐cells into β‐cells Abstract.

O objetivo deste artigo é investigar a filosofia do diálogo, de Martin Buber, e a ética da alteridade, de Emmanuel Lévinas, como propostas filosóficas de mudança de paradigma em relação à alteridade e sensibilidade. Almeja-se expor as aproximações e divergências entre os pensamentos dos filósofos para, na sequência, analisar sua influência sobre o trabalho de Enrique Dussel. Trata-se de pesquisa qualitativa, que emprega a técnica de pesquisa bibliográfica e se divide em três momentos, cada qual representado por um dos autores (...) elencados neste estudo. Como conclusão, destaca-se que ainda que tanto o pensamento levinasiano quanto o buberiano representem formas distintas (ainda que, em diferentes passagens, aproximadas e quiçá comparáveis) de entender a alteridade, Dussel parece reagir mais vividamente à influência de Lévinas, cujas reflexões constituem uma crítica à lógica do eu egocêntrico. (shrink)

Human geography, as a subject, has become widely recognized since its connections with the social sciences have widened and deepended the study of people, places and social structures. Horizons in Human Geography provides a clear and accessible sketch map of some of the latest and most promising developments in the subject. The book starts by assessing the role and limitations of techniques, models and theories and proceeds to provide a broad-ranging overview of the major social, cultural, urban, regional, political, economic (...) and environmental issues confronting geographers today. Contents: Introduction; Part I: Beyond The Quantitative Revolution; Part II: People and Places, Societies and Spaces; Part III: Explorations in the City; IV: Landscapes of Production; Part V: Regional Geographies and Global Perspectives; Part VI: Politicising The Environment. Contributors: Derek Gregory, Rex Walford, Michael J. Clark, Alan Wilson, R. J. Johnston, John Eyles, Denis Cosgrove, Linda McDowell, Roger Lee, Keith Bassett, John Short, Richard Dennis, Ian Douglas, Doreen Massey, Richard Meegan, John Harriss, Barbara Hariss, Nigel Thrift, Michael Taylor, Peter Taylor, Graham E. Smith, Stuart Cobridge, Judith Rees, Timothy O'Riordan and Bill Mead. (shrink)

Empirical evidence suggests that people often confabulate when they are asked about their choices or reasons for action. The implications of these studies are the topic of intense debate in philosophy and the cognitive sciences. An important question in this debate is whether the confabulation studies pose a serious threat to the possibility of self-knowledge. In this paper we are not primarily interested in the consequences of confabulation for self-knowledge. Instead, we focus on a different issue: what confabulation implies for (...) the special status of self-attributions, i.e. first-person authority. In the first part of the paper, we propose that FPA is based on a capacity for self-regulation. Accordingly, FPA depends on the extent to which we are able to bridge the gap between our sayings and doings by aligning our actions with our avowed self-ascriptions and vice versa. FPA is withheld when we fail at such re-alignment. In the second part of the paper, we contrast our view with the accounts of Scaife and Bortolotti :227–249, 2018). We claim that the apparent fact that we cannot reliably distinguish, from a first-person perspective, when we are confabulating and when we are not, does not necessarily undermine FPA. We argue that a systematic failure to align our actions with our self-ascriptions and vice-versa is a genuine threat to FPA. In the last part of the paper, we introduce the concept of self-know-how—the know-how embodied in the way one is disposed to relate to oneself in making sense of oneself with or in the face of others—and briefly explored the importance of diminished or absent self-know-how in clinical cases. (shrink)

Air is an immersive substance that envelopes us and binds us together, yet it has dominantly been taken for granted and left out of educational and other theorizations. This article develops a conceptualization of the pneumatic common in order to address this gap. The specific intervention staged is within recent educational literature on the common by Noah De Lissovoy, Tyson E. Lewis, and Alexander Means. This literature is surveyed and analyzed in relation to educational theory, curriculum, pedagogy, and policy. Claiming (...) that the air is a central feature of and paradigm for the common, I then concentrate on making the air conditions of the educational common explicit. I do this through a theoretical, historical, and sociological reading of air conditioning. While this explicitation is itself educational, I return to the educational common at the end of the article to ask how and what we can learn in, with, and from the air. (shrink)

One of the first questions that paleontologists ask when they identify a large-scale trend in the fossil record (e.g., size increase, complexity increase) is whether it is passive or driven. In this article, I explore two questions about driven trends: (1) what is the underlying cause or source of the directional bias? and (2) has the strength of the directional bias changed over time? I identify two underdetermination problems that prevent scientists from giving complete answers to these two questions.

Derek Parfit’s view of personal identity raises questions about whether advance decisions refusing life-saving treatment should be honored in cases where a patient loses psychological continuity; it implies that these advance decisions would not be self-determining at all. However, rather than accepting that an unknown metaphysical ‘further fact’ underpins agential unity, one can accept Parfit’s view but offer a different account of what it implies morally. Part II of this article argues that contractual obligations provide a moral basis for (...) honoring advance decisions refusing life-saving and/or life-sustaining medical treatment; advance decisions have similarities to contracts, such as life insurance policies and will-contracts, that come into effect when the psychological discontinuity is through death. (shrink)

1 Evidence-based policy requires researchers to provide the answers to ecological questions that are of interest to policy makers. To find out what those questions are in the UK, representatives from 28 organizations involved in policy, together with scientists from 10 academic institutions, were asked to generate a list of questions from their organizations. 2 During a 2-day workshop the initial list of 1003 questions generated from consulting at least 654 policy makers and academics was used as a basis for (...) generating a short list of 100 questions of significant policy relevance. Short-listing was decided on the basis of the preferences of the representatives from the policy-led organizations. 3 The areas covered included most major issues of environmental concern in the UK, including agriculture, marine fisheries, climate change, ecosystem function and land management. 4 The most striking outcome was the preference for general questions rather than narrow ones. The reason is that policy is driven by broad issues rather than specific ones. In contrast, scientists are frequently best equipped to answer specific questions. This means that it may be necessary to extract the underpinning specific question before researchers can proceed. 5 Synthesis and applications. Greater communication between policy makers and scientists is required in order to ensure that applied ecologists are dealing with issues in a way that can feed into policy. It is particularly important that applied ecologists emphasize the generic value of their work wherever possible. (shrink)

When managing their emotions, individuals often recruit the help of others; however, most emotion regulation research has focused on self-regulation. Theories of emotion and aging suggest younger and older adults differ in the emotion regulation strategies they use when regulating their own emotions. If how individuals regulate their own emotions and the emotions of others are related, these theorised age differences may also emerge for interpersonal emotion regulation. In two studies, younger and older adults’ intrapersonal and interpersonal emotion regulation strategy (...) choices were examined via self-report and behavioural assessments of regulating the emotions of another participant (Study 1; N = 80) and of a virtual human (Study 2; N = 100). Across both studies, younger adults reported greater intrapersonal suppression but not greater reappraisal. Younger and older adults were generally similar (supported by Bayesian analyses) for both self-reported and behavioural interpersonal emotion regulation strategies. Behavioural interpersonal emotion regulation was not related to self-reported intra- and interpersonal preferences. These results suggest interpersonal emotion regulation in ageing may show distinct patterns from theorised age differences in intrapersonal emotion regulation. (shrink)

Quantities like mass and temperature are properties that come in degrees. And those degrees (e.g. 5 kg) are properties that are called the magnitudes of the quantities. Some philosophers (e.g., Byrne 2003; Byrne & Hilbert 2003; Schroer 2010) talk about magnitudes of phenomenal qualities as if some of our phenomenal qualities are quantities. The goal of this essay is to explore the anti-physicalist implication of this apparently innocent way of conceptualizing phenomenal quantities. I will first argue for a metaphysical thesis (...) about the nature of magnitudes based on Yablo’s proportionality requirement of causation. Then, I will show that, if some phenomenal qualities are indeed quantities, there can be no demonstrative concepts about some of our phenomenal feelings. That presents a significant restriction on the way physicalists can account for the epistemic gap between the phenomenal and the physical. I’ll illustrate the restriction by showing how that rules out a popular physicalist response to the Knowledge Argument. (shrink)

Ambivalence is most naturally characterized as a case of conflicting desires. In most cases, an agent’s intrinsic desires conflict contingently: there is some possible world in which both desires would be satisfied. This paper argues, though, that there are cases in which intrinsic desires necessarily conflict—i.e., the desires are not jointly satisfiable in any possible world. Desiring a challenge for its own sake is a paradigm case of such a desire. Ambivalence of this sort in an agent’s desires creates special (...) problems for the project of reducing all facts about an agent’s desires to facts about his or her preferences over options. If this reductive project fails, there is reason to suspect that the Decision Theory cannot give us a complete theory of Humean rationality. (shrink)