Our aim here is to lay the groundwork for formal tree-ring analysis combining data from dendrochronology with formal techniques from semantics. We will present the basic syntax of, and basic compositional semantics of tree-ring structures.

We use data collected among Hadza hunter-gatherers between 2005 and 2009 to examine hypotheses about the causes and consequences of men’s foraging and food sharing. We find that Hadza men foraged for a range of food types, including fruit, honey, small animals, and large game. Large game were shared not like common goods, but in ways that significantly advantaged producers’ households. Food sharing and consumption data show that men channeled the foods they produced to their wives, children, and their consanguineal (...) and affinal kin living in other households. On average, single men brought food to camp on 28% of days, married men without children at home on 31% of days, and married men with children at home on 42% of days. Married men brought fruit, the least widely shared resource, to camp significantly more often than single men. A model of the relationship between hunting success and household food consumption indicates that the best hunters provided 3–4 times the amount of food to their families than median or poor hunters. These new data fill important gaps in our knowledge of the subsistence economy of the Hadza and uphold predictions derived from the household and kin provisioning hypotheses. Key evidence and assumptions backing prior claims that Hadza hunting is largely a form of status competition were not replicated in our study. In light of this, family provisioning is a more viable explanation for why good hunters are preferred as husbands and have higher fertility than others. (shrink)

In three experiments, subjects attempted to track multiple items as they moved independently and unpredictably about a display. Performance was not impaired when the items were briefly (but completely) occluded at various times during their motion, suggesting that occlusion is taken into account when computing enduring perceptual objecthood. Unimpaired performance required the presence of accretion and deletion cues along fixed contours at the occluding boundaries. Performance was impaired when items were present on the visual field at the same times and (...) to the same degrees as in the occlusion conditions, but disappeared and reappeared in ways which did not implicate the presence of occluding surfaces (e.g. by imploding and exploding into and out of existence, instead of accreting and deleting along a fixed contour). Unimpaired performance did not require visible occluders (i.e. Michotte’s tunnel effect) or globally consistent occluder positions. We discuss implications of these results for theories of objecthood in visual attention. (shrink)

Midstream modulation is a form of public engagement with science which benefits from strategic application of science and technology studies (STS) insights accumulated over nearly 20 years. These have been developed from STS researchers’ involvement in practical engagement processes and research with scientists, science funders, policy and other public stakeholders. The strategic aim of this specific method, to develop what is termed second-order reflexivity amongst scientist-technologists, builds upon and advances earlier more general STS work. However this method is focused and (...) structured so as to help generate such reflexivity—over the ‘upstream’ questions which have been identified in other STS research as important public issues for scientific research, development and innovation—amongst practising scientists-technologists in their specialist contexts (public or private, in principle). This is a different focus from virtually all such previous work, and offers novel opportunities for those key broader issues to be opened up. The further development of these promising results depends on some important conditions such as identifying and engaging research funders and other stakeholders like affected publics in similar exercises. Implementing these conditions could connect the productive impacts of midstream modulation with wider public engagement work, including with ‘uninvited’ public engagement with science. It would also generate broader institutional and political changes in the larger networks of institutional actors which constitute contemporary technoscientific innovation and governance processes. All of these various broader dimensions, far beyond the laboratory alone, need to be appropriately open, committed to democratic needs, and reflexive, for the aims of midstream modulation to be achieved, whilst allowing specialists to work as specialists. (shrink)

The question of the nature of free will remains a perennial challenge for philosophy. The French philosopher Henri Bergson was one who sought to address this challenge. He argued that traditional conceptions of the free-will debate would not suffice. He suggested that both determinist and libertarian accounts fall foul of spatializing tendencies. Bergson's first major work, Time and Free Will, sought to ground his understanding of freedom, in contrast to traditional understandings, in the concept of duration. Bergson, however, actively resisted (...) attempts to define clearly freedom, which he believed ultimately leads to a spatializing of freedom. By attending to Bergson's concept of duration in Time and Free Will, and how this concept relates to freedom, it becomes possible to articulate a positive conception of freedom. This becomes important when arguing for the validity of Bergson's ideas in the current climate. Thus, a positive conception of freedom for Bergson can be “defined” as “the creation of the new within the flow of duration.” It is, however, not something that can be defined, but is something that can be located. (shrink)

While a necessary condition for perceiving a physical object is that the object cause the perceiver to undergo a sense experience, this condition is not sufficient. causal theorists attempt to provide a sufficient condition by placing constraints on the way the object causes the perceiver's experience. i argue that this is not possible since the relationship between a perceiver's experience and an object in virtue of which the perceiver perceives the object does not supervene on any of the ways in (...) which the object causes the perceiver's experience. (shrink)

Frank Hindriks has attempted to derive a variant of Timothy Williamson’s knowledge rule for assertion on the basis of a more fundamental belief expression analysis of that speech act. I show that his attempted derivation involves a crucial equivocation between two senses of ‘must,’ and therefore fails. I suggest two possible repairs; but I argue that even if they are successful, we should prefer Williamson’s fully general knowledge rule to Hindriks’s restricted moral norm.

Early Renaissance naturalists worked to identify the plans described in ancient sources. But during the middle decades of the sixteenth century, naturalists instead began to describe and name plans unknown to the ancients. They also divided nature much more finely, distinguishing species that their predecessors had lumped together. As a result, they created an information overload. Dictionaries of synonyms and local flora were invented in the early seventeenth century as partial solutions to this problem of information overload.

This thesis is about toleration as a modality of citizenship for pluralistic societies. Its central argument is that the current dissatisfaction with "mere" toleration which we find so broadly represented in our public and scholarly cultures is based on an underestimation of the capacities and attitudes that toleration entails. The liberal recasting of toleration, sophisticated and indeed invaluable though it is abets this devaluation by focusing too exclusively on public justification and on the Lockean stream of the tradition from which (...) we draw. ;The present thesis begins by tracing some of the difficulties facing the Rawlsian and Habermasian projects if we accept a vivid picture of the pluralisms amidst which we live. It then sketches the central features of a complementary tradition of toleration as it flows to us through the works of Montaigne, William James, Mikhail Bakhtin and others. An attempt is made to show where the resources drawn from this tradition might fit in to a theory of citizenship given reasonable Rawlsian qualms about "thick" public conceptions and given the fissiparous nature of a civil society like ours. The thesis ends with a pair of empirically oriented chapters which show ways in which we could conceive a praxis of toleration which might respond to the issues raised in the earlier sections of the work. (shrink)

Amodel for inventing newsignals is introduced in the context of sender–receiver games with reinforcement learning. If the invention parameter is set to zero, it reduces to basic Roth–Erev learning applied to acts rather than strategies, as in Argiento et al. (Stoch. Process. Appl. 119:373–390, 2009). If every act is uniformly reinforced in every state it reduces to the Chinese Restaurant Process—also known as the Hoppe–Pólya urn—applied to each act. The dynamics can move players from one signaling game to another during (...) the learning process. Invention helps agents avoid pooling and partial pooling equilibria. (shrink)

One central claim of orthodox Christianity is that in Jesus of Nazareth, God became man. On Chalcedonian orthodoxy, this involves one person, God the Son, having two natures, divine and human. If He does, one person has two properties, deity and humanity. But the Incarnation also involves concrete objects, God the Son (GS), Jesus’s human body (B) and—I will assume—Jesus’s human soul (S). If God becomes human, GS, B and S somehow become one thing. It would be good to have (...) a metaphysical account of their oneness. I have suggested one. Thomas Senor has criticized my suggestion. I now reply to his case. (shrink)

There are two views of the essences of speech acts: according to one view, they are natural kinds; according to the other, they are what I call normative kinds—kinds in the (possibly non-reductive) definition of which some normative term occurs. In this article I show that speech acts can be normative but also natural kinds by deriving Williamson's account of assertion, on which it is an act individuated, and constitutively governed, by a norm (the knowledge rule), from a consideration of (...) the natural characteristics of normal cases of its performance. (shrink)

This article draws from theories of business-government relations and Austrian economics to develop a model relating firm performance to the firm’s market and nonmarket actions. Nonmarket actions represent one mechanism for the implementation of firm strategies. The model is tested using an original data set covering airlines serving international routes in the North Atlantic region. Results suggest that nonmarket actions have a positive and significant impact on performance, measured in three ways: profits, market share, and capacity utilization.

The claim that God is eternal is a standard feature of late–classical and mediaeval philosophical theology. It is prominent in discussions of the relation of God's foreknowledge to human freedom, and its consequences pervade traditional accounts of other kinds of divine knowledge, of God's will, and of God's relation to the world. So an examination of the concept of eternity promises to repay our efforts with a better understanding of the history of philosophical theology and with insight into the concept (...) of God. Eleonore Stump and Norman Kretzmann's ‘Eternity’ is a forceful, sophisticated presentation and defence of the notion of eternity. Our treatment of eternity will focus on two of Stump and Kretzmann's claims. First, Stump and Kretzmann contend that eternity isa kind of ‘atemporal duration’. We will see that while this is true, it is only part of the story. Second, Stump and Kretzmann claim to provide a viable account of how the existence of an eternal being can be simultaneous with some temporal event. We will see that and why they have not done so. (shrink)

ABSTRACTCitizens in John Rawls's well-ordered society face an assurance dilemma. They wish to act justly only if they are reasonably sure their fellow citizens will also act justly. According to Rawls, this assurance problem is solved through public reasoning. This paper argues that public reason cannot serve this function. It begins by arguing that one kind of incompleteness public reason faces that most Rawlsians grant is ubiquitous but unproblematic from a normative standpoint is problematic from an assurance perspective: it makes (...) it possible for citizens to argue for policy conclusions that are favored by their private interests, rather than justice. In response, perhaps the thing to do is structure deliberative democratic institutions such that citizens will always be incentivized to use public reasons to only argue for conclusions they believe are favored by justice. The paper proves that this is impossible by extending the Gibbard–Satterthwaite theorem. (shrink)

Time travel is a solved problem. Einstein showed that if you travel in a spaceship for months at speeds close to the speed of light, you can return to earth centuries in the future.

Two naturalistic explications of propositional attitudes and their contents are distinguished: the language of thought based theory, on which beliefs are relations to sentences in the language of thought; and the propositional attitude based theory, on which beliefs are functional states of a functional system that does not imply a language of thought, although consistent with it. The latter theory depends on interpersonally ascribable conceptual roles; if these are not available, the language of thought theory has the advantage. But the (...) propositional attitude based theory explains intentionality and conceptual structure as well as the language of thought based theory, and it has two further advantages. First, it does not make the existence of beliefs and desires depend on the language of thought hypothesis. Secondly, its employment of interpersonally ascribable conceptual roles permits a theory of truth conditions to meet certain desiderata, such as a social basis for truth conditions, and a realist conception of truth. (shrink)

In The Metaphysics of Creation and The Metaphysics of Theism, Norman Kretzmann defends an argument for God's existence which he claims to find in Aquinas. I assess this argument's key premise, a principle of sufficient reason, that: ‘PSR2: Every existing thing has a reason for its existence either in the necessity of its own nature or in the causal efficacy of some other beings’. PSR2 requires God's nature to explain His existence. Kretzmann does not tell us how this explanation is (...) supposed to go. I examine such ways as I can envision that God's own nature might explain His existence. None pan out. I argue contra Kretzmann that if God is simple, as Aquinas understood this, His nature does not explain His existence, and while His existence is in itself per se notum (‘self-evident’) this does not entail that it has an explanation. If this is correct, we ought not to read Aquinas as committed to PSR2. Further, if I'm right that it's impossible for ‘the necessity of a thing's nature’ to explain its existence, PSR2 is true only if every existing thing has a reason for its existence in the causal efficacy of some other beings. So, if I'm right, theists ought to steer clear of PSR2, at least read in terms of genuine explanation. I finally offer a weaker reading of ‘a reason for its existence’ which does not generate the problems of the stronger reading Kretzmann seems to have in mind. This too, though, turns out to have its problems. (shrink)

A philosophical analysis of the discourses, practices, and effects of representation in political institutions, focusing on American democracy.

This paper contains a positive development and a negative argument. It develops a theory of function loss and shows how this undermines an objection raised against the etiological theory of function in support of the modal theory of function. Then it raises two internal problems for the modal theory of function.

This paper explores the role of divine speaking in Christian ethics, critically engaging with the tendency in modern evangelicalism to seek to derive moral principles from Scripture or a biblically-derived ontology, often via deployment of map-making metaphors. The paper sets out the rather different centrality of the divine claim found in biblical accounts of good or righteous human action. Drawing on the criticisms of the anthropologist Tim Ingold of what he calls the “map-making fallacy,” the paper concludes by suggesting the (...) methodological importance of understanding the orientation of the Christian life to be a fundamentally grounded in interpersonal responsivity. (shrink)

Fast and effective detection of the causative agent of malaria in humans, protozoan Plasmodium parasites, is of crucial importance for increasing the effectiveness of treatment and to control a devastating disease that affects millions of people living in endemic areas. The microscopic examination of Giemsa‐stained blood films still remains the gold‐standard in Plasmodium detection today. However, there is a high demand for alternative diagnostic methods that are simple, fast, highly sensitive, ideally do not rely on blood‐drawing and can potentially be (...) conducted by the patients themselves. Here, the history of Plasmodium detection is discussed, and advantages and disadvantages of diagnostic methods that are currently being applied are assessed. (shrink)

For nearly four centuries Peter of Spain's influential Summaries of Logic was the basis for teaching logic; few university texts were read by more people. This new translation presents the Latin and English on facing pages, and comes with an extensive introduction, chapter-by-chapter analysis, notes, and a full bibliography.