This research note is meant to introduce into philosophical discussion the preliminary results of an empirical study on the state of blacks in philosophy, which is a joint effort of the American Philosophical Association’s Committee on the Status of Black Philosophers (APA CSBP) and the Society of Young Black Philosophers (SYBP). The study is intended to settle factual issues in furtherance of contributing to dialogues surrounding at least two philosophical questions: What, if anything, is the philosophical value of demographic diversity (...) in professional philosophy? And what is philosophy? The empirical goals of the study are (1) to identify and enumerate U.S. blacks in philosophy, (2) to determine the distribution of blacks in philosophy across career stages, (3) to determine correlates to the success of blacks in philosophy at different career stages, and (4) to compare and contrast results internally and externally to explain any career stage gaps and determine any other disparities. (shrink)

I analyse the political, economic, and cultural circumstances that have given rise to persistent political disputes about race (known colloquially as “the culture war”) among a subset of Americans. I argue that they point to a deep tension between widely held normative aspirations and pervasive and readily observable material facts about our society. The characterological pathologies this gives rise to are discussed, and a normatively preferable path forward for an individual attempting to reconcile themselves to the current social order is (...) suggested. (shrink)

What differentiates scientific research from non-scientific inquiry? Philosophers addressing this question have typically been inspired by the exalted social place and intellectual achievements of science. They have hence tended to point to some epistemic virtue or methodological feature of science that sets it apart. Our discussion on the other hand is motivated by the case of commercial research, which we argue is distinct from (and often epistemically inferior to) academic research. We consider a deflationary view in which science refers to (...) whatever is regarded as epistemically successful, but find that this does not leave room for the important notion of scientific error and fails to capture distinctive social elements of science. This leads us to the view that a demarcation criterion should be a widely upheld social norm without immediate epistemic connotations. Our tentative answer is the communist norm, which calls on scientists to share their work widely for public scrutiny and evaluation. (shrink)

I discuss the peculiar optimism present in an influential strand of analytic philosophy, and compare it with the more morose philosophical anthropology one might naturally pick up from other fields.

Philosophers of science debate the proper role of non-epistemic value judgements in scientific reasoning. Many modern authors oppose the value free ideal, claiming that we should not even try to get scientists to eliminate all such non-epistemic value judgements from their reasoning. W. E. B. Du Bois, on the other hand, has a defence of the value free ideal in science that is rooted in a conception of the proper place of science in a democracy. In particular, Du Bois argues (...) that the value free ideal must be upheld in order to, first, retain public trust in science and, second, ensure that those best placed to make use of scientifically acquired information are able to do so. This latter argument turns out to relate Du Bois’ position on the value free ideal in science to his defence of epistemic democracy. In this essay I elaborate, motivate, and relate to the modern debate, Du Bois’ under-appreciated defence of the value free ideal. (shrink)

Preferably scientific investigations would promote true rather than false beliefs. The phenomenon of fraud represents a standing challenge to this veritistic ideal. When scientists publish fraudulent results they knowingly enter falsehoods into the information stream of science. Recognition of this challenge has prompted calls for scientists to more consciously adopt the veritistic ideal in their own work. In this paper I argue against such promotion of the veritistic ideal. It turns out that a sincere desire on the part of scientists (...) to see the truth propagated may well promote more fraud rather than less. (shrink)

Social scientists report difficulties in drawing out testable predictions from the literature on intersectionality theory. We alleviate that difficulty by showing that some characteristic claims of the intersectionality literature can be interpreted causally. The formalism of graphical causal modeling allows claims about the causal effects of occupying intersecting identity categories to be clearly represented and submitted to empirical testing. After outlining this causal interpretation of intersectional theory, we address some concerns that have been expressed in the literature claiming that membership (...) in demographic categories can have causal effects. (shrink)

This paper addresses the problem of judgment aggregation in science. How should scientists decide which propositions to assert in a collaborative document? We distinguish the question of what to write in a collaborative document from the question of collective belief. We argue that recent objections to the application of the formal literature on judgment aggregation to the problem of judgment aggregation in science apply to the latter, not the former question. The formal literature has introduced various desiderata for an aggregation (...) procedure. Proposition-wise majority voting emerges as a procedure that satisfies all desiderata which represent norms of science. An interesting consequence is that not all collaborating scientists need to endorse every proposition asserted in a collaborative document. (shrink)

Using a decision theoretic model of scientists’ time allocation between potential research projects I explain the fact that on average women scientists publish less research papers than men scientists. If scientists are incentivised to publish as many papers as possible, then it is necessary and sufficient for a productivity gap to arise that women scientists anticipate harsher treatment of their manuscripts than men scientists anticipate for their manuscripts. I present evidence that women do expect harsher treatment and that scientists’ are (...) incentivised to publish as many papers as possible, and discuss some epistemological consequences of this conjecture. (shrink)

A sketch of my ethical views, or secular moral philosophy. Emphasis is on stating how it all hangs together.

Critical race theorists and standpoint epistemologists argue that agents who are members of dominant social groups are often in a state of ignorance about the extent of their social dominance, where this ignorance is explained by these agents' membership in a socially dominant group (e.g., Mills 2007). To illustrate this claim bluntly, it is argued: 1) that many white men do not know the extent of their social dominance, 2) that they remain ignorant as to the extent of their dominant (...) social position even where this information is freely attainable, and 3) that this ignorance is due in part to the fact that they are white men. We argue that on Buchak's (2010, 2013) model of risk averse instrumental rationality, ignorance of one's privileges can be rational. This argument yields a new account of elite-group ignorance, why it may occur, and how it might be alleviated. (shrink)

The logical empiricists expressed a consistent attitude to racial categorisation in both the ethical and scientific spheres. Their attitude may be captured in the following slogan: human racial taxonomy is an empirically meaningful mode of classifying persons that we should refrain from deploying. I offer an interpretation of their position that would render coherent their remarks on race with positions they adopted on the scientific status of taxonomy in general, together with their potential moral or political motivations for adopting that (...) position. (shrink)

Chater & Loewenstein argue that i-frame research has been coopted by private interests opposed to system-level reform, leading to ineffective interventions. They recommend that behavioural scientists refocus on system-level interventions. We suggest that the influence of private interests on research is problematic for wider normative and epistemic reasons. A system-level intervention to shield research from private influence is needed.

I wrote an essay about why I do philosophy. It would probably not be publishable anywhere, but I think it might be of some interest to others as we reflect on why we do what we do. For those who know me from online I hope in this to provide illustrations of the categories "Sexy Murder Poet" and "Basically Pleasant Bureaucrat", since it so happens that the two tendencies within me can be sorted by these. In any case, I hope (...) the essay helps people think about what they hope to get from philosophy, and whether the tools they adopt are adequate to the tasks they thus set themselves. (shrink)

Prepublication peer review should be abolished. We consider the effects that such a change will have on the social structure of science, paying particular attention to the changed incentive structure and the likely effects on the behaviour of individual scientists. We evaluate these changes from the perspective of epistemic consequentialism. We find that where the effects of abolishing prepublication peer review can be evaluated with a reasonable level of confidence based on presently available evidence, they are either positive or neutral. (...) We conclude that on present evidence abolishing peer review weakly dominates the status quo. (shrink)

It's natural to think of scientists as truth seekers, people driven by an intense curiosity to understand the natural world. Yet this picture of scientists and scientific inquiry sits uncomfortably with the reality and prevalence of scientific fraud. If one wants to get at the truth about nature, why lie? Won't that just set inquiry back, as people pursue false leads? To understand why this occurs – and what can be done about it – we need to understand the social (...) structures scientists work within, and how some of the institutions which enable science to be such a successful endeavour all things considered, also abet and encourage fraud. (shrink)

Jennifer Lackey makes the case that non-summativist accounts of group belief cannot adequately account for an important difference between group lies and group belief. Since non-summativist accounts fail to do this, she argues that they ought be rejected and that we should seek an account of group belief which can do better by this standard. I briefly summarize Lackey’s argument, to give a sense of the role I see the central desideratum playing, and outline her arguments for that desideratum. I (...) then critique one of the positive arguments she offers for the desideratum, briefly outlining the notion of explication and why I think it would not license the appeal to the Group Lie Desideratum that Lackey’s argument depends upon. This leads me to reflections on the broader project of analysing notions of group belief, and the role I think such endeavours can or ought to play in social epistemology more broadly. (shrink)

I outline a defence of a naive group-level standpoint epistemology. According to this view then under conditions often met in real situations of oppression, it is the majority view on questions of import to those marginalised by oppression that ought to be treated as deference worthy. I further argue that this view is inspired by and coheres well with various doctrines laid out and defended by W.E.B. Du Bois, making this a recognisably Duboisian vision of standpoint epistemology. The central conceptual (...) move is to relate principles of social epistemology under conditions of oppression that were of great interest to Du Bois with the conditions for group accuracy that have been studied by social-choice theorists working on Condorcet’s Jury Theorem, as well as contemporary epistemological work on group polarisation. I argue that once these elements are brought together a surprisingly cogent case for deference to the simple majority view of the marginalised can often be made. (shrink)

Intersectionality theory explores the special sorts of disadvantage that arise as the result of occupying multiple disadvantaged demographic categories. One significant methodological problem for the quantitative study of intersectionality is the difficulty of acquiring data sets large enough to produce significant results when one is looking for intersectional effects. For this reason, we argue, simulation methods may be particularly useful to this branch of theorizing because they can generate precise predictions and causal dependencies in a relatively cheap way, and can (...) thus guide future empirical work. We illustrate this point through models which show that intersectional oppression can arise under conditions where social groups are disadvantaged in the emergence of bargaining norms. As we show, intersectional disadvantage can arise even when actors from all social categories are completely identical in terms of preferences and abilities. The conditions necessary to derive such disadvantage are relatively minimal. And when actors behave in ways that reflect stronger intersectional identities, the potential for disadvantage increases. (shrink)

How diverse is philosophy? In this paper we explore recent data on the racial, ethnic, and gender diversity of philosophy students and faculty in the United States. We have found that women are underrepresented in philosophy at all levels from first-year intention to major through senior faculty. The past four years have seen an increase in the percentage of women philosophy majors at the undergraduate level, but it remains to be seen if this recent increase in the percentage of women (...) will eventually also show at more advanced stages. Temporal trends since 2000 also show substantial increases in the racial and ethnic diversity of philosophy majors at all levels of education from first-year undergraduate through PhD, with substantial declines in the percentage of non-Hispanic White philosophy majors and substantial increases in all other commonly measured racial/ethnic groups except for Native American / Alaska Native. Despite generally increasing diversity, people who identify as Hispanic (any race), or non-Hispanic Native American, Alaska Native, or Black remain substantially underrepresented in philosophy at all levels compared to their presence in the U.S. population, and in some cases also as compared to other majors. (shrink)

Social scientists use many different methods, and there are often substantial disagreements about which method is appropriate for a given research question. In response to this uncertainty about the relative merits of different methods, W. E. B. Du Bois advocated for and applied “methodological triangulation”. This is to use multiple methods simultaneously in the belief that, where one is uncertain about the reliability of any given method, if multiple methods yield the same answer that answer is confirmed more strongly than (...) it could have been by any single method. Against this, methodological purists believe that one should choose a single appropriate method and stick with it. Using tools from voting theory, we show Du Boisian methodological triangulation to be more likely to yield the correct answer than purism, assuming the scientist is subject to some degree of diffidence about the relative merits of the various methods. This holds even when in fact only one of the methods is appropriate for the given research question. (shrink)

We argue that the main results of scientific papers may appropriately be published even if they are false, unjustified, and not believed to be true or justified by their author. To defend this claim we draw upon the literature studying the norms of assertion, and consider how they would apply if one attempted to hold claims made in scientific papers to their strictures, as assertions and discovery claims in scientific papers seem naturally analogous. We first use a case study of (...) William H. Bragg’s early 20th century work in physics to demonstrate that successful science has in fact violated these norms. We then argue that features of the social epistemic arrangement of science which are necessary for its long run success require that we do not hold claims of scientific results to their standards. We end by making a suggestion about the norms that it would be appropriate to hold scientific claims to, along with an explanation of why the social epistemology of science—considered as an instance of collective inquiry—would require such apparently lax norms for claims to be put forward. (shrink)

W.E.B. Du Bois successfully organized a sociological research lab in turn-of-the-twentieth-century Atlanta. By examining his practice as a research organizer, as well as the philosophical principles which undergirded much of his scientific work, we can draw lessons about how to solve pressing problems of social epistemology—that is to say, problems with how we produce and disseminate knowledge through collective inquiry. Many of the problems we deal with in contemporary science are caused by problems in our institutional or incentive structures. For (...) instance, we do not sufficiently replicate past work in large part because we have not organized scientific inquiry so as to encourage this. The lessons Du Bois may teach us can thus speak directly to contemporary issues. (shrink)

Peer review is often taken to be the main form of quality control on academic research. Usually journals carry this out. However, parts of maths and physics appear to have a parallel, crowd-sourced model of peer review, where papers are posted on the arXiv to be publicly discussed. In this paper we argue that crowd-sourced peer review is likely to do better than journal-solicited peer review at sorting papers by quality. Our argument rests on two key claims. First, crowd-sourced peer (...) review will lead on average to more reviewers per paper than journal-solicited peer review. Second, due to the wisdom of the crowds, more reviewers will tend to make better judgments than fewer. We make the second claim precise by looking at the Condorcet Jury Theorem as well as two related jury theorems developed specifically to apply to peer review. (shrink)

Given the importance of scientific research in shaping our perception of the world, and our senses of what policies will and won’t succeed in altering that world, it is of great practical, political, and moral importance that we carry out scientific research with integrity. The phenomenon of scientific fraud stands in the way of that, as scientists may knowingly enter claims they take to be false into the scientific literature, often knowingly doing so in defiance of norms they profess allegiance (...) to. In this chapter we take a look at some of the causes of scientific fraud, and how it might be manifested in large-scale research teams and situations of anonymous authorship. We find that such cases make trouble for what might seem like intuitive answers to the question “who should be held responsible for this fraud?”, and we argue that in such cases it would be better to hold the entire community responsible for seeing to it that there is less fraud. (shrink)

We argue that deliberative decision-making that is inclusive, transparent and accountable can contribute to more trustworthy and legitimate decisions on difficult ethical questions and political trade-offs during the pandemic and beyond.

Volume 19, Issue 6, June 2019, Page 76-78.

Objective: There is a demonstrated link between the mental health and substance use comorbidities experienced by young adults, however the vast majority of psychological interventions are disorder specific. Novel psychological approaches that adequately acknowledge the psychosocial complexity and transdiagnostic needs of vulnerable young people are urgently needed. A modular skills-based program for emotion regulation and impulse control addresses this gap. The current one armed open trial was designed to evaluate the impact that 12 weeks exposure to ERIC alongside usual care (...) had on young people's ability to regulate emotions, as well as examine potential moderating mechanisms.Methods: Seventy nine young people were enrolled to the 12 week intervention period. Twenty one practitioners from youth and community health services delivered relevant ERIC modules adjunct to usual care. Linear mixed effects regression was used to examine change over time across the primary outcome of emotion dysregulation and secondary outcomes of depression, anxiety, stress, experiential avoidance and mindfulness. Moderation analyses were conducted to test whether the magnitude of change in emotion dysregulation moderated change over time in secondary outcomes.Results: Analyses revealed significant improvement in the primary outcome of emotion dysregulation with a moderate effect size, in addition to decreases in the secondary outcomes of depression, anxiety, stress and experiential avoidance. No improvements in mindfulness were reported. Moderation analyses revealed that the residualised change over time in emotion dysregulation moderated the change over time in symptoms of distress, depression, anxiety, stress, experiential avoidance, and mindfulness.Conclusion: Reductions in the severity of emotion dysregulation, depression, anxiety, stress and experiential avoidance are promising, and were evident despite the complexity of the participants and the diversity of the service setting. The improvements found in each outcome were only observed for those young people whose emotion regulation also improved, providing preliminary evidence for the role of emotion regulation as a key treatment target in this population. (shrink)

We have compared the decay rates of KL and KS to π+π- and π0π0 final states using a subset of the data from the KTeV experiment at Fermilab. We find that the direct-CP-violation parameter Re is equal to [28.0 ± 3.0 ± 2.8] × 104. This result definitively establishes the existence of CP violation in a decay process. © 1999 The American Physical Society.

BackgroundThe expectation of pandemic-induced severe resource shortages has prompted authorities to draft and update frameworks to guide clinical decision-making and patient triage. While these documents differ in scope, they share a utilitarian focus on the maximization of benefit. This utilitarian view necessarily marginalizes certain groups, in particular individuals with increased medical needs.Main bodyHere, we posit that engagement with the disability critique demands that we broaden our understandings of justice and fairness in clinical decision-making and patient triage. We propose the capabilities (...) theory, which recognizes that justice requires a range of positive capabilities/freedoms conducive to the achievement of meaningful life goals, as a means to do so. Informed by a disability rights critique of the clinical response to the pandemic, we offer direction for the construction of future clinical triage protocols which will avoid ableist biases by incorporating a broader apprehension of what it means to be human.ConclusionThe clinical pandemic response, codified across triage protocols, should embrace a form of justice which incorporates a vision of pluralistic human capabilities and a valuing of positive freedoms. (shrink)

The modern world is multicultural and multilingual, it creates difficulties for the mutual contacts of the nations with different languages. The problem of overcoming the language barrier in a multilingual world is urgent. One of the best ways to solve this problem is bilingualism: possession of two languages, a native and a second one, generally intermediate language. The choice of the intermediate language is determined by socio-political and socio-economic conditions of contacting people. In a multinational state official language of the (...) country serves as an intermediate language. In the multi-ethnic Russian Federation, Russian language chosen as the intermediate language, by which representatives of different nationalities come into contact with each other. National-Russian bilingualism in the Russian Federation has become a mass phenomenon: all non-Russian population in varying degrees is fluent in Russian language. Further improvement of bilingualism at the present stage is solved in the new format - as an active bilingualism. In an active and harmonious bilingualism, languages distribute responsibilities among themselves: native language and intermediate language perform different public functions and the number of functions is usually not equal, one language performs more functions than the other does. It depends on the status of the language: the higher the status of the language, the more reason a speaker has for its extensive use in different areas of communication. Harmonious bilingualism helps to keep the national identity of each language and makes it possible to operate each of them on an equal footing in a multicultural space. Among the many politically and legally equal languages of the Russian Federation, a special place belongs to the Russian language: it performs a consolidating function, combines the languages of the nations of Great Russia into one united family. Multilingual Russia can be compared with a starry firmament. The more bright stars we can see, the more beautiful the starry sky is. The star of the Russian language in the sky shines especially bright. (shrink)

abstract: The purpose of this paper is to draw attention to a fundamental, yet frequently over-looked, component of Christian contemplative and Buddhist meditative practice: the cultivation of shame in the face of one's lapses of body, speech, and mind. In this Christian tradition, this is called penthos, or compunction; in the Buddhist sutras and subsequent commentarial literature, it is referred to as hiri-ottappa, or moral shame and moral dread. According to both Evagrius of Pontus and many in the early Buddhist (...) tradition, no progress can be made along the spiritual path as long as one has not squarely recognized—and openly admitted to—such failings. In a cultural context in which contemplative prayer and meditation are cast either as exercises in self-affirmation or as propaedeutics to social transformation, I suggest that repositioning Buddhist-Christian dialog on a forthright acknowledgment of our common human frailty and unskillfulness can lead to a more robust, and grounded, form of mutual engagement. (shrink)

In the article, the author represents a specific function of a metaphor - emphatic function that in its turn proceeds from the emotional one. The author unfolds the role, significance, and effects of emotional and emphatic functions of metaphor in the dialogues of Internet discourse. The formation of stable emotional relations is the most important condition of human development, the main aim and the final result of his education as well as the essential factor for the formation of empathy - (...) an important psychological reaction. The author proves that a metaphor is the means of creation and development of empathy, which is a state when a person sympathizes with another human’s feelings so much that starts identifying himself with this human for some time. Art as a whole and fiction in particular by means of a metaphor and figurativeness make for the formation of empathy. In Internet discourses the empathy expressed by the communicants in lexemes with direct meaning or by means of metaphors and phraseological units leads to creation of an open and friendly dialogue among the communicants. Thus, a metaphor thanks to its bright expressiveness either supports a positive mood in the dialogues of Internet forum or intensifies negative feelings and emotions to one another and escalates a conflict. Since a metaphor stimulates the development of empathy, the ability to produce and use metaphors and phraseological units in the speech, it can be considered as a significant factor in upbringing an accomplished personality able to understand other people’s feeling and communicate successfully with those around. (shrink)

Featuring an 18.0 megapixel CMOS sensor and DIGIC 4 image processor for high image quality and speed, ISO 100-6400 for shooting from bright to dim light, and many more great features, the Canon EOS Rebel T2i brings professional features into an entry-level digital SLR. The Canon EOS Rebel T2i/550D Digital Field Guide will teach you how to get the most out of these impressive features so you can improve your photography skills. CHAPTER 1: Setting Up the EOS Rebel T2i/550D. (...) – This chapter will help you set up your T2i so you can get the best image quality from your Canon T2i. It will also cover different ways to review your images and protect them from accidental deletion. CHAPTER 2: Controlling Exposure and Focus. – Learn about the different types of shooting modes on your T2i, as well as image exposure and how to modify it for individual shooting scenarios. CHAPTER 3: Getting Great Color. – This chapter explores the concepts of light and color, and teaches you how to select a white balance and picture style on your T2i for maximum color rendering. CHAPTER 4: Customizing the EOS Rebel T2i/550D. – Learn how to set up your T2i for common and uncommon shooting situations. CHAPTER 5: Shooting in Live View and Tethered. – This chapter explains the T2i’s Live View feature and how to shoot tethered to a computer. CHAPTER 6: Using Movie Mode. – A great starting point for any photographer to explore the world of digital video with the T2i, this chapter will teach you how to shoot and playback video on the T2i. CHAPTER 7: Using Flash. – This chapter explores flash technology, and how to use the T2i’s on board flash and menu options for the built-in flash and for EX-Series Speedlites. CHAPTER 8: Exploring Canon Lenses and Accessories. This chapter covers popular T2i lenses and how they impact the images you capture with your T2i. CHAPTER 9: The Elements of Exposure and Composition. – Learn how aperture, shutter speed, and ISO affect your images, and how they work together to determine exposure. This chapter also covers the basics of composing images with your T2i. CHAPTER 10: Event and Action Photography. – Learn how to capture action in your images, plus some tips and tricks for general event photography, including how to capture great photos in low lighting. CHAPTER 11: Nature and Landscape Photography. – This chapter explores how to approach shooting nature and landscape images with your T2i. CHAPTER 12: Portrait Photography. – Learn how to set up the T2i for portrait shooting, plus information on choosing backgrounds, lighting, and other tips and tricks for taking great portraits. APPENDIX A: Exploring RAW Capture. – This chapter contains an overview of RAW capture as well as a brief walk-through on converting RAW images into a final image. APPENDIX B: How to Use the Gray and Color Checker cards. – Learn how to produce photos with accurate color and exposure with these free-inside-the-book tools. A full-color, portable-trim book with beautiful photography for photographers on the go, the Canon EOS Rebel T2i/550D Digital Field Guide includes a free Grey/Color checker card to help you achieve accurate white balance and color. With the Canon EOS Rebel T2i/550D Digital Field Guide, you will gain a thorough understanding of the T2i dSLR, as well as the basic fundamentals of capturing the best possible photos. (shrink)

The essence of Baars’ paper is to propose nine functions for consciousness. By way of introducing these functions we are presented with a metaphor of a theatre, in which players act, operators set contexts behind the scenes, an unconscious audience provides specialised capabilities, and, of course, a bright spotlight of attention illuminates whatever is available to consciousness. The value of this metaphor is not entirely clear, with the separate ‘roles’ of the audience and of the operators behind the scenes (...) being particularly difficult to identify. Additionally, there may be a problem with idea that there is some kind of competition between actors who are seeking the spotlight of attention, for this suggests that the components of thought have volitions of their own. These would, indeed, be dangerous thoughts. Rather than attempting an analysis of the metaphor and its potential usefulness, this commentary will consider the nine functions of consciousness that have been proposed. (shrink)

Versuche zur Bestimmung der Abhängigkeit der Unterschiedsschwelle einer geometrischen Grössendimension von der Intensität bei verschiedener schwacher, nahe der absoluten Intensitätsschwelle liegender Lichter. Im Gegensatz zu den komplizierten Formeln, die die Abhängigkeit bei höheren Lichtintensitäten dargeben, gilt nahe der Minimalschwelle der Intensität ein bilinearer Ausdruck der Invarianz des Produkts der Reizunterschiedsschwelle der Grössendimension und der Lichtintensität . Die Bedeutung des Befundes im Zusammenhang mit früheren ähnlichen Ergebnissen wird besprochen.Experiments on determination of the difference threshold of visual size using different, weak lights, (...) near the absolute intensity threshold, are presented. Contrary to the complicated formulae obtained when the light is bright, near the minimal intensity threshold a simple bilinear equation holds true: the product of the stimulus threshold of visual size and the intensity threshold is found to be invariant. The significance of the findings are discussed in connection with similar, previous results.Des expériences pour déterminer le seuil spatial différentiel , en utilisant différentes lumières faibles, à la limite du seuil de l'intensité absolue, sont exposées. Contrairement aux formules compliquées qu'onn obtient avec des lumières intenses, près du seuil minime de l'intensité, une simple expression bilinéaire est valable: le produit du seuil spatial et du seuil de l'intensité est invariable. La signification de ce fait est discutée, en même temps que des résultats analogues antérieurs. (shrink)

Deciduous trees remobilize the nitrogen in senescing leaves during the process of autumn colouration, which in many species is associated with increased concentrations of anthocyanins. Archetti1 and Hamilton and Brown2 observed that autumn colouration is stronger in tree species facing a high diversity of specialist aphids. They proposed a coevolution theory that the bright colours in autumn might provide an honest signal of defence commitment, thus deterring migrant aphids from settling on the leaves. So far, there have been very (...) few experimental results to support the hypothesis, and tree commitment to phenolics‐based defences has not shown direct protection against aphids. Predators and parasitoids have been found to be the major controllers of arboreal aphids. Indirect defences involve the emission of attractive volatile compounds that enhance the effectiveness of carnivorous enemies. The indirect defence hypothesis is presented to explain low aphid diversity on tree species that are green during autumn. The hypothesis suggests that green foliage can continue to produce herbivore‐inducible plant volatiles and maintain volatile‐based indirect plant defences against aphids until leaf abscission. BioEssays 30:889–896, 2008. © 2008 Wiley Periodicals, Inc. (shrink)

My dissertation defends a Humean theory of property rights against its neo-Lockean and ‘resource egalitarian’ rivals. Humean property rights are conventional and not grounded in pre-institutional moral entitlements. Nevertheless, the importance of property rights for facilitating social cooperation between people with differing views about justice gives them normative authority even when they do not conform to ideal principles of distributive justice or ‘natural right.’ I develop a conceptual architecture of property rights and property interests in order to dispel confusion about (...) the relationship between property’s legal form and economic substance. Although the structure of property rights constrains the extent to which property ownership can be fragmented in the service of egalitarian distributive goals, robust private property rights are compatible with extensive social insurance. This analysis undermines the neo-Lockean position that all redistributive taxation is an infringement of property rights and provides an attractive middle ground between libertarianism and strong forms of egalitarianism. Humean theory justifies giving normative weight to pre-tax property entitlements when determining tax obligations. I use this insight to rebut Liam Murphy and Thomas Nagel’s argument that principles of tax equity are vacuous because pre-tax income has no moral significance. Viewing tax policy exclusively from the perspective of post-tax income effaces the important role of tax fairness norms in preventing wasteful tax policy when people disagree about fundamental principles of distributive justice. I distinguish my view from Gerald Gaus’ recent critique of Murphy and Nagel. Whereas Gaus is skeptical of redistributive taxation, my theory of tax fairness is compatible both with classical liberalism and with a more robust social welfare state. (shrink)

This is undoubtedly one of the most well-conceived and nicely executed introductory books on special relativity ever written. The authors take the view that relativity theory is no longer an advanced and esoteric branch of physics, but ought to be part of the basic intellectual equipment of any bright college student. To this end, the theory of special relativity is presented as a complete and unified set of concepts and not merely as a kind of gloss on classical Newtonian (...) mechanics. This is accomplished in a manner which captures the flavor and excitement of theoretical physics and makes it available to persons of modest mathematical means, and at the same time avoids the overpopularizing and lack of rigor which so often afflict works of this kind. The text is accompanied by numerous non-trivial problems, many with solutions, and a large number of helpful drawings. There is also a reasonable amount of discussion of matters of philosophic interest, and of the most recent experimental inquiries, including a section on the significance of the Mössbauer effect. Altogether, a first-rate job.—H. P. K. (shrink)