Wavefunction collapse models modify Schrödinger's equation so that it describes the rapid evolution of a superposition of macroscopically distinguishable states to one of them. This provides a phenomenological basis for a physical resolution to the so-called “measurement problem.” Such models have experimentally testable differences from standard quantum theory. The most well developed such model at present is the Continuous Spontaneous Localization (CSL) model in which a universal fluctuating classical field interacts with particles to cause collapse. One “side effect” of this (...) interaction is that the field imparts energy to the particles: experimental evidence on this has led to restrictions on the parameters of the model, suggesting that the coupling of the classical field to the particles must be mass-proportional. Another “side effect” is that the field imparts momentum to particles, causing a small blob of matter to undergo random walk. Here we explore this in order to supply predictions which could be experimentally tested. We examine the translational diffusion of a sphere and a disc, and the rotational diffusion of a disc, according to CSL. For example, we find that the rms distance an isolated 10−5 cm radius sphere diffuses is ≈(its diameter, 5 cm) in (20 sec, a day), and that a disc of radius 2 ⋅ 10−5 cm and thickness 0.5 ⋅ 10−5 cm diffuses through 2πrad in about 70 sec (this assumes the “standard” CSL parameter values). The comparable rms diffusions of standard quantum theory are smaller than these by a factor 10−3±1. It is shown that the CSL diffusion in air at STP is much reduced and, indeed, is swamped by the ordinary Brownian motion. It is also shown that the sphere's diffusion in a thermal radiation bath at room temperature is comparable to the CSL diffusion, but is utterly negligible at liquid He temperature. Thus, in order to observe CSL diffusion, the pressure and temperature must be low. At the low reported pressure of 5 ⋅ 10−17 Torr, achieved at 4.2°K, the mean time between air molecule collisions with the (sphere, disc) is ≈(80, 45)min. This is ample time for observation of the putative CSL diffusion with the standard parameters and, it is pointed out, with any parameters in the range over which the theory may be considered viable. This encourages consideration of how such an experiment may actually be performed, and the paper closes with some thoughts on this subject. (shrink)

The continuous spontaneous localization (CSL) model modifies Schrödinger's equation so that the collapse of the state vector is described as a physical process (a special interaction of particles with a universal fluctuating field). A consequence of the model is that an electron in an atom should occasionally get “spontaneously” knocked out of the atom. The CSL ionization rate for the 1s electrons in the Ge atom is calculated and compared with an experimental upper limit for the rate of “spontaneously” generated (...) x-ray pulses in Ge. This gives, for the first time, an experimental constraint on the parameters which characterize this model (the GRW parameters and the relative collapse rate of electrons and nucleons). It is concluded that the values assigned to the GRW parameters by GRW may be maintained only if the coupling of electrons to the fluctuating field is 0.35% or less than the coupling of nucleons, suggestive of a mass-proportional (and therefore gravitational) collapse mechanism. For other allowed values of the GRW parameters, it is still argued that nucleons should collapse more rapidly than electrons. (shrink)

ABSTRACT Most theorists agree that our social order includes a distinctive legal dimension. A fundamental question is that of whether reference to specific legal phenomena always involves a commitment to a particular moral view. Whereas many philosophers advance the ‘positivist’ claim that any correspondence between morality and the law is just a function of political circumstance, natural law theorists insist that law is intrinsically moral. Each school claims the crucial advantage of consistency with our folk concept. Drawing on the notion (...) of dual character concepts, we develop a set of hypotheses about the intuitive relation between a rule’s moral and legal aspects. We then report a set of studies that conflict unexpectedly with the predictions by legal positivists. Intuitively, an evil rule is not a fully-fledged instance of law. (shrink)

In _What Animals Teach Us about Politics_, Brian Massumi takes up the question of "the animal." By treating the human as animal, he develops a concept of an animal politics. His is not a human politics of the animal, but an integrally animal politics, freed from connotations of the "primitive" state of nature and the accompanying presuppositions about instinct permeating modern thought. Massumi integrates notions marginalized by the dominant currents in evolutionary biology, animal behavior, and philosophy—notions such as play, (...) sympathy, and creativity—into the concept of nature. As he does so, his inquiry necessarily expands, encompassing not only animal behavior but also animal thought and its distance from, or proximity to, those capacities over which human animals claim a monopoly: language and reflexive consciousness. For Massumi, humans and animals exist on a continuum. Understanding that continuum, while accounting for difference, requires a new logic of "mutual inclusion." Massumi finds the conceptual resources for this logic in the work of thinkers including Gregory Bateson, Henri Bergson, Gilbert Simondon, and Raymond Ruyer. This concise book intervenes in Deleuze studies, posthumanism, and animal studies, as well as areas of study as wide-ranging as affect theory, aesthetics, embodied cognition, political theory, process philosophy, the theory of play, and the thought of Alfred North Whitehead. (shrink)

Almaatouq et al. view the purpose of research is to map variable-to-variable relationships (e.g., the effect of X on Y). They also view theory as this mapping of variable-to-variable relationships rather than an explanation of why the relationships occur. However, it is theory as explanation that allows us to reconcile disparate findings and that should guide application.

Recently four different papers have suggested that the supervaluational solution to the Problem of the Many is flawed. Stephen Schiffer (1998, 2000a, 2000b) has argued that the theory cannot account for reports of speech involving vague singular terms. Vann McGee and Brian McLaughlin (2000) say that theory cannot, yet, account for vague singular beliefs. Neil McKinnon (2002) has argued that we cannot provide a plausible theory of when precisifications are acceptable, which the supervaluational theory needs. And Roy Sorensen (2000) (...) argues that supervaluationism is inconsistent with a directly referential theory of names. McGee and McLaughlin see the problem they raise as a cause for further research, but the other authors all take the problems they raise to provide sufficient reasons to jettison supervaluationism. I will argue that none of these problems provide such a reason, though the arguments are valuable critiques. In many cases, we must make some adjustments to the supervaluational theory to meet the posed challenges. The goal of this paper is to make those adjustments, and meet the challenges. (shrink)

Color coded terror alerts, invasion, drone war, rampant surveillance: all manifestations of the type of new power Brian Massumi theorizes in _Ontopower_. Through an in-depth examination of the War on Terror and the culture of crisis, Massumi identifies the emergence of preemption, which he characterizes as the operative logic of our time. Security threats, regardless of the existence of credible intelligence, are now felt into reality. Whereas nations once waited for a clear and present danger to emerge before using (...) force, a threat's felt reality now demands launching a preemptive strike. Power refocuses on what _may_ emerge, as that potential presents itself to feeling. This affective logic of potential washes back from the war front to become the dominant mode of power on the home front as well. This is ontopower—the mode of power embodying the logic of preemption across the full spectrum of force, from the “hard” to the "soft". With _Ontopower_, Massumi provides an original theory of power that explains not only current practices of war but the culture of insecurity permeating our contemporary neoliberal condition. (shrink)

Concerned about widespread incompetence among voters in democratic societies, epistocrats propose quasi-democratic electoral systems that amplify the voices of competent voters while silencing (or perhaps just subduing) the voices of those deemed incompetent. In order to amplify the voices of the competent we first need to know what counts as political competence, and then we need a way of identifying those who possess the relevant characteristics. After developing an account of what it means to be politically competent, I argue that (...) there is no way for the epistocrat to identify such persons. Therefore, epistocracy cannot be implemented. (shrink)

After first noting that I seek to broaden the definition of science fiction to a little more loosely defined speculative fiction, this essay explores four different ways in which fiction can work together with both the sciences and the philosophy of perception. This cooperation is needed because there is much about the sensory worlds of humans and non-human animals of which we continue to be ignorant. First, speculative fiction can be a source of hypotheses about the nature of the senses. (...) Second, it can help us understand the inner worlds of beings different from us. Third, speculative fiction often pushes us to investigate the ethical and social dimensions of sensory difference. Finally, speculative fiction can play an important role in reconciling our scientific understanding of the senses with a more commonsense understanding of same. (shrink)

This study employs a qualitative approach to investigate the factors influencing engagement in Irish employee wellbeing programmes. Two stages of data collection were conducted, involving 52 employees completing open-ended questionnaires in Stage 1 and 23 participants interviewed in Stage 2. Three themes emerged from the thematic analysis of the data: (1) communicating wellbeing initiatives; (2) creating and maintaining interest in wellbeing; and (3) challenges to employee wellbeing. The three themes and their subthemes provide qualitative evidence from employees on the barriers (...) to and drivers of workplace wellbeing initiative utilisation through the lenses of Resource utilisation Theory and Culture of Health. The findings underscore the importance of supportive environments and effective design in enhancing programme utilisation, along with the need to offer targeted initiatives addressing secondary and tertiary wellbeing issues. By addressing shortcomings in Irish workplaces, this research contributes to advancing the effectiveness and impact of workplace wellbeing initiatives at multiple levels: organisational, individual, and governmental. (shrink)

In a recent paper, Barrio, Pailos and Szmuc (BPS) show that there are logics that have exactly the validities of classical logic up to arbitrarily high levels of inference. They suggest that a logic therefore must be identified by its valid inferences at every inferential level. However, Scambler shows that there are logics with all the validities of classical logic at every inferential level, but with no antivalidities at any inferential level. Scambler concludes that in order to identify a logic, (...) we at least need to look at the validities and the antivalidities of every inferential level. In this paper, I argue that this is still not enough to identify a logic. I apply BPS’s techniques in a super/sub-valuationist setting to construct a logic that has exactly the validities and antivalidities of classical logic at every inferential level. I argue that the resulting logic is nevertheless distinct from classical logic. (shrink)

This paper contributes to the underdeveloped field of experimental philosophy of science. We examine variability in the philosophical views of scientists. Using data from Toolbox Dialogue Initiative, we analyze scientists’ responses to prompts on philosophical issues (methodology, confirmation, values, reality, reductionism, and motivation for scientific research) to assess variance in the philosophical views of physical scientists, life scientists, and social and behavioral scientists. We find six prompts about which differences arose, with several more that look promising for future research. We (...) then evaluate the difference between the natural and social sciences and the challenge of interdisciplinary integration across scientific branches. (shrink)

This essay traces the phenomenon of revelation beginning with the humblest, to the most personal, to the most exalted. Through this analysis, we discover several qualities of revelation: it reveals itself from itself, reveals a new world to me, and reveals another me to myself and to others. Turning to divine Revelation, a further set of concepts is uncovered: the witness who encounters a Revelation without understanding it, a resistance to the testimony of the witness, and a paradox that provokes (...) this resistance by exceeding expectations. These qualities make Revelation both more intelligible and meaningful. For, while holding an exceptional privilege, divine Revelation nonetheless remains in continuity with phenomenality in general and, in arriving from elsewhere by its own initiative, it opens my eyes to the unfolding of its unseen reserves. (shrink)

This major new series in the philosophy of science aims to provide a new generation of textbooks for the subject. The series will not only offer fresh treatments of core topics in the theory and methodology of scientific knowledge, but also introductions to newer areas of the discipline. Furthermore, the series will cover topics in current science that raise significant foundational issues both for scientific theory and for philosophy more generally. Biology raises distinct questions of its own not only for (...) philosophy of science, but for metaphysics, epistemology and ethics. This comprehensive new textbook for a rapidly growing field of study provides students new to the subject with an up-to-date presentation of the key philosophical issues. Care is taken throughout to keep the technicalities accessible to the non-biologist but without sacrificing the philosophical subtleties. The first part of the book covers the philosophical challenges posed by evolution and evolutionary biology, beginning with Darwin's central argument in the Origin of the Species. Individual chapters cover natural selection, the selfish gene, alternative units of selection, developmental systems theory, adaptionism and issues in macroevolution. The second part of the book examines philosophical questions arising in connection with biological traits, function, nature and nurture, and biological kinds. The third part of the book examines metaphysical questions, biology's relation with the traditional concerns of philosophy of science, and how evolution has been introduced into epistemological debates. The final part considers the relevance of biology to questions about ethics, religion and human nature. (shrink)

In this discussion note we argue, contrary to the thrust of a recent article by Jenann Ismael, that resolving the paradox of predictability does not require denying the possibility of a natural oracle, and thus stands in no need of the response that she proposes.

Molyneux’s question, whether the newly sighted might immediately recognize tactilely familiar shapes by sight alone, has produced an array of answers over three centuries of debate and discussion. I propose the first pluralist response: many different answers, both yes and no, are individually sufficient as an answer to the question as a whole. I argue that this is possible if we take the question to be cluster concept of sub-problems. This response opposes traditional answers that isolate specific perceptual features as (...) uniquely applicable to Molyneux’s question and grant viability to only one reply. Answering Molyneux’s question as a cluster concept may also serve as a methodology for resolving other philosophical problems. (shrink)

January 6th, 2013 at Kyoto University. Organizer: Hisashi Nakao.

The primary objective of this article is to describe how the children of soldiers critiqued and examined media representations of war. Taken from a more extensive qualitative case study involving eight teachers, this article examines one social studies teacher and her students’ perspectives on media coverage of war through two Socratic Seminar discussions focused on two wars: the American Civil War and Gulf War. Data was collected through interviews, focus groups, and classroom observations. Students leveled a specific set of critiques (...) at television media and those who consume it. They also grappled with two ethical quandaries: censorship and the justness of war. This article emerged from an unusual place – a Mathew Brady photograph. The teacher, a lecturer typically, decided to engage her students in discussion. This discussion was designed to provide “process and sense-making time,” according to their teacher, Ms. Jones, after four days of lecture on the American Civil War. Yet, the discussion grew into something much different than Ms. Jones's original plan. It evolved into an interrogation of how the media represents war. Inspired by the thoughtful discussion, several months later, Ms. Jones engaged the same students in an examination of media representations of the first Gulf War. Ms. Jones is the focus of this article because out of the eight other teachers in the larger qualitative study, she was the only one to focus on classroom time (two entire class sessions) on media representations of war. (shrink)

Rational self-interest is often seen as being at the heart of liberal economic theory. In _The Power at the End of the Economy_ Brian Massumi provides an alternative explanation, arguing that neoliberalism is grounded in complex interactions between the rational and the emotional. Offering a new theory of political economy that refuses the liberal prioritization of individual choice, Massumi emphasizes the means through which an individual’s affective tendencies resonate with those of others on infra-individual and transindividual levels. This nonconscious (...) dimension of social and political events plays out in ways that defy the traditional equation between affect and the irrational. Massumi uses the Arab Spring and the Occupy Movement as examples to show how transformative action that exceeds self-interest takes place. Drawing from David Hume, Michel Foucault, Gilles Deleuze, Niklas Luhmann and the field of nonconsciousness studies, Massumi urges a rethinking of the relationship between rational choice and affect, arguing for a reassessment of the role of sympathy in political and economic affairs. (shrink)

This major new series in the philosophy of science aims to provide a new generation of textbooks for the subject. The series will not only offer fresh treatments of core topics in the theory and methodology of scientific knowledge, but also introductions to newer areas of the discipline. Furthermore, the series will cover topics in current science that raise significant foundational issues both for scientific theory and for philosophy more generally. Biology raises distinct questions of its own not only for (...) philosophy of science, but for metaphysics, epistemology and ethics. This comprehensive new textbook for a rapidly growing field of study provides students new to the subject with an up-to-date presentation of the key philosophical issues. Care is taken throughout to keep the technicalities accessible to the non-biologist but without sacrificing the philosophical subtleties. The first part of the book covers the philosophical challenges posed by evolution and evolutionary biology, beginning with Darwin's central argument in the Origin of the Species. Individual chapters cover natural selection, the selfish gene, alternative units of selection, developmental systems theory, adaptionism and issues in macroevolution. The second part of the book examines philosophical questions arising in connection with biological traits, function, nature and nurture, and biological kinds. The third part of the book examines metaphysical questions, biology's relation with the traditional concerns of philosophy of science, and how evolution has been introduced into epistemological debates. The final part considers the relevance of biology to questions about ethics, religion and human nature. (shrink)

In this discussion, I claim that the debate over ‘the bias towards the present’ turns on an axiological question. Is the value of a present experience greater than its value when past? I argue not and hold that our bias towards the present, understood as a pure time preference, is irrational.

The primary objective of this article is to detail how two teachers in the same school site, in the American Southeast, taught war to the children of soldiers. Taken from an extensive qualitative case study involving eight teachers, this article examines the pedagogies engaged in by two teachers who expressed a desire to teach war more critically to their students. Critically here means but is not exclusive to raising student consciousness to issues of war not typically taught including investigating how (...) power, race, gender, and sex operate in war, more closely examining decisions evaluating them for their justness or unjustness. In short a more authentic exploration of war. One teacher engaged a pedagogy of tension the other a pedagogy of facts. Both resulted in a less than critical examination of war. A pedagogy of tension reflected this teacher's reaction to pressure from the community and fear of surfacing or inflicting trauma upon students. A pedagogy of facts reflected the second teachers’ beliefs that focusing teaching on facts will allow her to teach a more critical rendition of war. A qualitative empirical study, data was collected through interview and classroom observation. (shrink)

This chapter explores a way in which visual processing may involve innate constraints and attempts to show how such processing overcomes one enduring challenge to nativism. In particular, many challenges to nativist theories in other areas of cognitive psychology have focused on the later development of such abilities, and have argued that such development is in conflict with innate origins. Innateness, in these contexts, is seen as antidevelopmental, associated instead with static processes and principles. In contrast, certain perceptual models demonstrate (...) how the very same mental processes can both be innately specified and yet develop richly in response to experience with the environment. This process is entirely unmysterious, as shown in certain formal theories of visual perception, including those that appeal to spontaneous endogenous stimulation and those based on Bayesian inference. (shrink)

How might the social sciences best be employed in the study of law, especially in light of today's legal climate of anti-foundationalism? Realistic Socio-Legal Theory addresses this question thoroughly and precisely. Drawing upon philosophical pragmatism to construct an epistemological and methodological foundation, this book formulates a framework for a realistic approach to socio-legal theory. Brian Z. Tamanaha contrasts the strengths of his realistic approach with those of the major schools of socio-legal theory through application to many key issues in (...) the field. He explores the problematic state of socio-legal studies, the relationship between behavior and meaning, the notion of legal ideology, the nature of the concept of law, the problem of indeterminacy in rule following and application, and the structure of judicial decision making. Tamanaha's discussion is always clear and concise as he articulates a social theory of law that draws equally from legal theory and socio-legal studies. His book has much to offer those interested in the gathering and organization of knowledge about law and legal phenomena. (shrink)

The paper identifies in the literature two categories of codes of ethics, inspirational and prescriptive, and introduces new classification categories of allodial and decretal. The first classification is based on the identity of the ethics decision‐maker – the authors or the addressees of codes. The second classification is based on whether operational definitions are applied by the codes. Such concrete definitions may be in the rules themselves, in related documents or be known from shared knowledge. The second classification has importance (...) if national associations of accountants use codes as a means for assurance of specific outcomes of defined ethical behaviours. For the study, a survey of 57 codes of ethics issued by national associations of professional accountants was undertaken to determine the basic features of codes and to analyse their content. The areas of ethical concern in national associations were identified and compared to the IFAC model code for professional accountants. The paper reports that national organisations of accountants have promulgated decretal codes in 96% of cases examined. As these codes contain operational definitions, their outcomes can be scientifically measured and sanctions for breaches fairly and reasonably imposed. (shrink)

I defend the view that Cicero writes the Academica from the perspective of an aspirationalist radical skeptic. In section 2 I examine the textual evidence regarding the nature of Cicero’s skeptical stance in the Academica. In section 3 I consider the textual evidence from the Academica for attributing aspirationalism to Cicero. Finally, in section 4 I argue that while aspirationalist radical skepticism is open to a number of philosophical objections, none of those objections is decisive.

Both experimental and ethnographic studies show that reciprocal exchanges (in which actors unilaterally provide benefits to each other without formal agreements) produce stronger trust than negotiated exchanges secured by binding agreements. We develop the theoretical role of risk and uncertainty as causal mechanisms that potentially explain these results, and then test their effects in two laboratory experiments that vary risk and uncertainty within negotiated and reciprocal forms of exchange. We increase risk in negotiated exchanges by making agreements nonbinding and decrease (...) uncertainty in reciprocal exchanges by having actors communicate their intentions. Our findings support three main theoretical conclusions. (1) Increasing risk in negotiated exchange produces levels of trust comparable to those in reciprocal exchange only if the partner's trustworthiness is near-absolute. (2) Decreasing uncertainty in reciprocal exchange either increases or decreases trust, depending on network structure. (3) Even when reciprocal and negotiated exchanges produce comparable levels of trust, their trust differs in kind, with reciprocal exchange partners developing trust that is more resilient and affect-based. (shrink)

[Brian P. McLaughlin] In recent years, some philosophers have claimed that we can know a priori that certain external world skeptical hypotheses are false on the basis of a priori knowledge that we are in certain kinds of mental states, and a priori knowledge that those mental states are individuated by contingent environmental factors. Appealing to a distinction between weak and strong a priority, I argue that weakly a priori arguments of this sort would beg the question of whether (...) the skeptical hypothesis under assessment is true, and that the prospect of a sound strongly a priori argument of this sort seems dim. \\\ [David Owens] Contemporary discussion of scepticism focuses on the possibility that most or all of our beliefs might be false. I argue that the hypothesis of massive falsity and the associated 'problem of the external world' are inessential to the scepticisms of Descartes and Hume. What drives Cartesian and Humean scepticism is the demand for certainty: any possibility of error, however local, must be ruled out before we can claim either justified belief or knowledge. Contemporary philosophers have ignored this form of scepticism because they doubt that the demand for certainty can be motivated. But Descartes provides a sound motivation for this demand in the Meditations. (shrink)

In his well-known time travel story, David Lewis claims that there is a sense in which Tim can go back in time and kill his Grandfather and a (more inclusive) sense in which he cannot. Lewis describes Tim’s predicament as semi-fatalist, but holds that this does not compromise Tim’s freedom or his ability to kill Grandfather. I argue that if semi-fatalism is true of Tim, it is true of everyone, and that this is a troubling conclusion.

Philosophical dialogue has the power to improve interdisciplinary scientific research. The Toolbox Dialogue Initiative (TDI) conducts workshops that foster philosophical dialogue among interdisciplinary researchers. This chapter focuses on 20 of these workshops, all of which used the Toolbox STEM (Science, Technology, Engineering, and Mathematics) instrument and were conducted with interdisciplinary research teams of scientists. We analyze data from some of these workshops and demonstrate that philosophical dialogues conducted using the Toolbox method have two salutary effects. First, they lead to a (...) significant increase in belief formation about philosophical topics relevant to interdisciplinary science. Scientists sometimes do not have preconceived commitments on issues in philosophy of science, and Toolbox workshops tend to prompt them to adopt views on these topics. Second, these philosophical …. (shrink)

Assisted reproductive technology is a global market engaging a variety of local moral economies where the construction of the demand–supply relationship takes different forms through the operation of the politics of value. This paper analyzes how the market–culture relationship works in different settings, showing how power and resources determine what value will, or will not, accrue from that relationship. A commodity’s potential economic value can only be realized through the operation of the market if its cultural status is seen to (...) be legitimate. At the same time, local moral economies and their associated social orders are potentially susceptible to the destabilizing implications of new commodities. The formal or informal organization of power relationships in the market–culture interaction can enable potential value to become manifest and tangible over time or block its path. The interaction is steered through national institutional sources of cultural authority embedded in state and religion, where the visible contest in the politics of value is conducted. Increasingly, that interaction finds its expression in transnational institutions of governance where the struggle for control of the cultural agenda reflects the global nature of the ART market. (shrink)

In our world we never observe an effect which is earlier than its cause. All of our experience is of future-directed causation. But many have thought that backwards causation is at least logically or metaphysically possible. Max Black famously argued against this thought. I think his argument fails, but it’s still instructive. The correct rejoinder to Black teaches us what backwards causation must be like in a world of free agents, and implies that we can never have reason to bring (...) about past events. (shrink)

This study brings together a number of related critical issues, including the causal laws that attempt to govern fictional worlds, the reader's implication in the causal dilemmas that confront major characters, and the philosophical and ideological ascriptions of cause that are variously embodied, interrogated, or parodied. One of the most significant features of this study is its disclosure of just how fundamental and widespread causal issues are in complex narratives - and how insistently they are thematized in twentieth-century works.

In a recent paper (in Argumentation, 2006) Robert Talisse and Scott Aikin suggest that we ought to recognize two distinct forms of the straw man fallacy. In addition to misrepresenting the strength of an opponent’s specific argument (= the representation form), one can also misrepresent the strength of one’s opposition in general, or the overall state of a debate, by selecting a (relatively) weak opponent for critical consideration (= the selection form). Here I consider whether we as philosophy professors could (...) be seen as sometimes committing the selection form of the straw man through the performance of our regular teaching duties. (shrink)

In this discussion paper I argue that Max Black's well-known bilking argument does not succeed in showing the impossibility of backwards causation.

I defend an inference to the best explanation (IBE) argument for anti-realism about reasons for acting based on the history of intractable disagreement in moral philosophy. The four key premises of the argument are: 1. If there were objective reasons for action, epistemically-well-situated observers would eventually converge upon them after two thousand years; 2. Contemporary philosophers, as the beneficiaries of two thousand years of philosophy, are epistemically well-situated observers; 3. Contemporary philosophers have not converged upon reasons for action; 4. Conclusion: (...) there are no objective reasons for action (IBE from the first three premises). The key premises of the IBE are (1) sentimentalism; (2) non-cognitivism about basic affects; and (3) philosophical arguments for what our reasons for action are always involve arguments that depend on a basic intuitive moral judgment (that can be explained in terms of a basic non-cognitive affect). All these premises are explored in detail, and various objections addressed. (shrink)