This paper poses an original puzzle about the relationship between causation and moral responsibility called The Moral Difference Puzzle. Using the puzzle, the paper argues for three related ideas: (1) the existence of a new sort of moral luck; (2) an intractable conflict between the causal concepts used in moral assessment; and (3) inability of leading theories of causation to capture the sorts of causal differences that matter for moral evaluation of agents’ causal contributions to outcomes.

A general method for generating contraction- and cut-free sequent calculi for a large family of normal modal logics is presented. The method covers all modal logics characterized by Kripke frames determined by universal or geometric properties and it can be extended to treat also Gödel-Löb provability logic. The calculi provide direct decision methods through terminating proof search. Syntactic proofs of modal undefinability results are obtained in the form of conservativity theorems.

A way is found to add axioms to sequent calculi that maintains the eliminability of cut, through the representation of axioms as rules of inference of a suitable form. By this method, the structural analysis of proofs is extended from pure logic to free-variable theories, covering all classical theories, and a wide class of constructive theories. All results are proved for systems in which also the rules of weakening and contraction can be eliminated. Applications include a system of predicate logic (...) with equality in which also cuts on the equality axioms are eliminated. (shrink)

This paper suggests that time travelling scenarios commonly depicted in science fiction introduce problems and dangers for the time traveller. If time travel takes time, then time travellers risk collision with past objects, relocation to distant parts of the universe, and time travel-specific injuries. I propose several models of time travel that avoid the dangers and risks of time travel taking time, and that introduce new questions about the relationship between time travel and spatial location.

Geometric theories are presented as contraction- and cut-free systems of sequent calculi with mathematical rules following a prescribed rule-scheme that extends the scheme given in Negri and von Plato. Examples include cut-free calculi for Robinson arithmetic and real closed fields. As an immediate consequence of cut elimination, it is shown that if a geometric implication is classically derivable from a geometric theory then it is intuitionistically derivable.

The purpose of this article is to describe the development of a model of moral distress in military nursing. The model evolved through an analysis of the moral distress and military nursing literature, and the analysis of interview data obtained from US Army Nurse Corps officers (n = 13). Stories of moral distress (n = 10) given by the interview participants identified the process of the moral distress experience among military nurses and the dimensions of the military nursing moral distress (...) phenomenon. Models of both the process of military nursing moral distress and the phenomenon itself are proposed. Recommendations are made for the use of the military nursing moral distress models in future research studies and in interventions to ameliorate the experience of moral distress in crisis military deployments. (shrink)

Free will, if such there be, involves free choosing: the ability to mentally choose an outcome, where the outcome is 'free' in being, in some substantive sense, up to the agent of the choice. As such, it is clear that the questions of how to understand free will and mental causation are connected, for events of seemingly free choosing are mental events that appear to be efficacious vis-a-vis other mental events as well as physical events. Nonetheless, the free will and (...) mental causation debates have proceeded largely independently of each other. Here we aim to make progress in determining how the free will and mental causation debates bear on one another. We first argue that the problems of free will and of mental causation can be seen as special cases of a more general problem, concerning whether and how mental events of a given type may be efficacious, qua the types of event they are---qualitative, intentional, freely deliberative---given their apparent causal irrelevancy for effects of the type in question; here we generalize what Horgan 1989 identifies as "the problem of mental quausation" (S1). We then build on this result to identify fruitful parallels between hard determinism and eliminative physicalism (S2) and soft determinism and non-reductive physicalism (S3). (shrink)

Obstetric violence has been analyzed from various perspectives. Its psychological effects have been evaluated, and there have been several recent sociological and anthropological studies on the subject. But what I offer in this paper is a philosophical analysis of obstetric violence, particularly focused on how this violence is lived and experienced by women and why it is frequently described not only in terms of violence in general but specifically in terms of gender violence: as violence directed at women because they (...) are women. For this purpose, I find feminist phenomenology most useful as a way to explain and account for the feelings that many victims of this violence experience and report, including feelings of embodied oppression, of the diminishment of self, of physical and emotional infantilization. I believe that the insights to be found in feminist phenomenology are crucial for explaining how and why this phenomenon is different in kind from other types of medical violence, objectification, and reification. Iris Marion Young’s description of feminine existence under patriarchy, as conformed by a perpetual oppressive “I cannot,” is at the center of my analysis. I argue that laboring bodies are at least potentially perceived as antithetical to the myth of femininity, undermining the feminine mode of bodily comportment under patriarchy and thereby seriously threatening the hegemonic powers. Violence, then, appears to be necessary in order to domesticate these bodies, to make them “feminine” again. (shrink)

Just as we may ask whether, and under what conditions, a collection of objects composes a single object, we may ask whether, and under what conditions, a collection of actions composes a single action. In the material objects literature, this question is known as the "special composition question," and I take it that there is a similar question to be asked of collections of actions. I will call that question the "special composition question in action," and argue that the correct (...) answer to this question depends on a particular kind of consequence produced by the individual constituent actions. (shrink)

With the emergence of systems biology the notion of organizing principles is being highlighted as a key research aim. Researchers attempt to ‘reverse engineer’ the functional organization of biological systems using methodologies from mathematics, engineering and computer science while taking advantage of data produced by new experimental techniques. While systems biology is a relatively new approach, the quest for general principles of biological organization dates back to systems theoretic approaches in early and mid-20th century. The aim of this paper is (...) to draw on this historical background in order to increase the understanding of the motivation behind the systems theoretic approach and to clarify different epistemic aims within systems biology. We pinpoint key aspects of earlier approaches that also underlie the current practice. These are i) the focus on relational and system-level properties, ii) the inherent critique of reductionism and fragmentation of knowledge resulting from overspecialization, and iii) the insight that the ideal of formulating abstract organizing principles is complementary to, rather than conflicting with, the aim of formulating detailed explanations of biological mechanisms. We argue that looking back not only helps us understand the current practice but also points to possible future directions for systems biology. (shrink)

This paper argues that causal idealism, the view that causation is a product of mental activity, should be considered a competetitor to contemporary views that incorporate human thought and agency into the causal relation. Weighing contextualism, contrastivism, or pragmatism about causation against causal idealism results in at least a tie with respect to the virtues of these theories.

Concerns with the use of engineering approaches in biology have recently been raised. I examine two related challenges to biological research that I call the synchronic and diachronic underdetermination problem. The former refers to challenges associated with the inference of design principles underlying system capacities when the synchronic relations between lower-level processes and higher-level systems capacities are degenerate. The diachronic underdetermination problem regards the problem of reverse engineering a system where the non-linear relations between system capacities and lower-level mechanisms are (...) changing over time. Braun and Marom argue that recent insights to biological complexity leave the aim of reverse engineering hopeless - in principle as well as in practice. While I support their call for systemic approaches to capture the dynamic nature of living systems, I take issue with the conflation of reverse engineering with naïve reductionism. I clarify how the notion of design principles can be more broadly conceived and argue that reverse engineering is compatible with a dynamic view of organisms. It may even help to facilitate an integrated account that bridges the gap between mechanistic and systems approaches. (shrink)

This paper throws some light on the nature of argumentation, its use and advantages, within the setting of doctor–patient interaction. It claims that argumentation can be used by doctors to offer patients reasons that work as ontological conditions for enhancing the decision making process, as well as to preserve the institutional nature of their relationship with patients. In support of these claims, selected arguments from real-life interactions are presented in the second part of the paper, and analysed by means of (...) a model of argumentation borrowed from classical rhetoric, and refined according to the modern orientation of the pragma-dialectic approach. (shrink)

The main result of this paper is a normalizing system of natural deduction for the full language of intuitionistic linear logic. No explicit weakening or contraction rules for -formulas are needed. By the systematic use of general elimination rules a correspondence between normal derivations and cut-free derivations in sequent calculus is obtained. Normalization and the subformula property for normal derivations follow through translation to sequent calculus and cut-elimination.

Volume 25, Issue 2, February 2025, Page 87-90.

Dialogue semantics for logic are two-player logic games between a Proponent who puts forward a logical formula φ as valid or true and an Opponent who disputes this. An advantage of the dialogical approach is that it is a uniform framework from which different logics can be obtained through only small variations of the basic rules. We introduce the composition problem for dialogue games as the problem of resolving, for a set S of rules for dialogue games, whether the set (...) of S-dialogically valid formulas is closed under modus ponens. Solving the composition problem is fundamental for the dialogical approach to logic; despite its simplicity, it often requires an indirect solution with the help of significant logical machinery such as cut-elimination. Direct solutions to the composition problem can, however, sometimes be had. As an example, we give a set N of dialogue rules which is well-justified from the dialogical point of view, but whose set N of dialogically valid formulas is both non-trivial and non-standard. We prove that the composition problem for N can be solved directly, and introduce a tableaux system for N. (shrink)

A proof-theoretical analysis of elementary theories of order relations is effected through the formulation of order axioms as mathematical rules added to contraction-free sequent calculus. Among the results obtained are proof-theoretical formulations of conservativity theorems corresponding to Szpilrajn’s theorem on the extension of a partial order into a linear one. Decidability of the theories of partial and linear order for quantifier-free sequents is shown by giving terminating methods of proof-search.

Contraction-free sequent calculi for intuitionistic theories of apartness and order are given and cut-elimination for the calculi proved. Among the consequences of the result is the disjunction property for these theories. Through methods of proof analysis and permutation of rules, we establish conservativity of the theory of apartness over the theory of equality defined as the negation of apartness, for sequents in which all atomic formulas appear negated. The proof extends to conservativity results for the theories of constructive order over (...) the usual theories of order. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Whiteness and the General WillDiversity Work as Willful WorkSara AhmedIn this essay I explore whiteness in relation to the general will. My starting point is that the idea of “the general will” offers us a vocabulary for thinking through the materiality of race. In his keynote address to the 40th Annual Philosophy Symposium in 2010, Charles Mills argues that race is material: it becomes part of the living human (...) body. Mills draws on recent theories of whiteness as habit, including the work of Linda Alcoff (2006) and Shannon Sullivan (2006). Quoting from Sullivan, he suggests that whiteness is in “the nose that smells, the back, neck and other muscles that imperceptibly tighten with anxiety, and the eyes that see some but not all physical differences as significant” (Sullivan 2006, 188). Whiteness is embodied; it is in bodily matter as well as affecting how bodies matter. Mills then suggests that the materiality of whiteness is its “resistance to will.” One definition of materiality could be this: resistance to will.This essay takes up the theme of the materiality of race by thinking of whiteness in relation to the will. There are clearly risks in such an undertaking: after all, the idea of whiteness as willed might seem to imply that whiteness is volitional: and can be simply “willed away.”1 I want to suggest that if whiteness is resistant to will, as that which cannot be simply willed away, then whiteness can also be understood as willed: in other words, what cannot be willed away is a willing way. Edward Said’s definition of Orientalism as “willed human work,” which as a definition has yet to be rigorously understood, could be considered an important precedent to my argument (1978, 140). The suggestion is not [End Page 1] simply that the Orient is brought into existence, or made to exist over time, but that the very labor of creating the Orient, the land of the stranger, the land far away, is what establishes a direction. Once the Orient has come to exist, there is a willing of its existence; to keep going that way is to keep that way going. Willed work is work that in willing that way creates a way that can be willed. It is not as the old English cliché says—where there’s a will there’s a way—but rather to will is to way. I think it is useful to think of whiteness in this way, as a willing way, which is of course only one way of thinking about whiteness.I pose the generality of the will as a way of reflecting on “institutional whiteness.” Whiteness becomes “the material” of an institutional body, whether that body is the nation, an organization, a neighborhood, or a street. We can consider an institution as a body with parts: it too has noses, mouths, muscles that register anxiety, as well as ears and eyes. Just think of how Neighborhood Watch, as a national or even global technology, uses the injunction that citizens should become the “eyes and ears of the police.” A good citizen is the one who accepts this injunction: the one who is willing to watch out for strangers, those who are loitering, who seem suspicious, or out of place. Institutions have “detection systems”: they have parts that register the approach of strangers. A collective body in registering those who are out of place, both creates strangers and establishes a direction toward them, as those who threaten the place of the “in place,” as those who generate anxiety.A key event in my own life was of becoming a stranger in a white neighborhood in Adelaide, Australia, in a place I called home. I was fourteen years old. I was stopped by two policemen in a car who asked me, “Are you Aboriginal?” It turned out that there had been some burglaries in the area. It was an extremely hostile address, and it was an unsettling experience at the time. It was an experience of being made into a stranger, the one who is recognized as “out of place,” as the one who does not belong, whose proximity is registered... (shrink)

A relation between two secrets, known in the literature as nondeducibility , was originally introduced by Sutherland. We extend it to a relation between sets of secrets that we call independence . This paper proposes a formal logical system for the independence relation, proves the completeness of the system with respect to a semantics of secrets, and shows that all axioms of the system are logically independent.

A constructive definition of the continuum based on formal topology is given and its basic properties studied. A natural notion of Cauchy sequence is introduced and Cauchy completeness is proved. Other results include elementary proofs of the Baire and Cantor theorems. From a classical standpoint, formal reals are seen to be equivalent to the usual reals. Lastly, the relation of real numbers as a formal space to other approaches to constructive real numbers is determined.

Despite the enormous progress made in the advancement of health technologies over the last century, infectious diseases continue to cause significant morbidity and mortality in developing countries. Neglected diseases are a subset of infectious diseases that lack treatments that are effective, simple to use, or affordable. Neglected diseases primarily affect populations in poor countries that do not constitute a lucrative market sector, thus failing to provide incentives for the pharmaceutical industry to conduct R&D for these diseases. Of the treatments that (...) do exist for neglected diseases, most are completely out-dated, with poor side-effect profiles, cumbersome logistics of administration, and inadequate efficacy. Historically, the impetus for a majority of neglected disease research was driven by early 20th-century colonialism, and in the post-colonial era, these diseases have been virtually ignored. Of the 1556 New Chemical Entities brought to market during the 30-year period from 1975 to 2004, only 20 — less than 0.02% — were for neglected diseases. (shrink)

The purpose of this study is to extend and replicate previously published results from a random probability sample of university faculty. The sample assessed reasons given for companion-animal guardianship and for belief in the beneficial health effects of owning pets. In this replication and extension design, these two non-random samples responded to the same questionnaire items as those addressed to university faculty. Results indicated that avoidance of loneliness was the most frequent reason for owning pets among both students and middle-aged (...) community members. This result is consistent with the view that animals provide social support and companionship to humans at various stages of the life cycle. Suggesting an emergent feature of the human-nonhuman animal bond, both groups selected, “the pet helps keep me active” as the second-most common reason. Older women reported a greater belief in the health-giving benefits of pet ownership than did younger persons or men. This belief may contribute to human benefits of pet ownership and requires further research. (shrink)

A case study in the kinds of problems to expect from this increasingly popular marketing tactic.

The struggle to delineate the relationship between theology and logic flourished in the thirteenth century and culminated in two condemnations in early 1277, one in Paris and the other in Oxford. To see how much and what kind of effect ecclesiastical actions such as condemnations and prohibitions to teach had on the development of logic in the Middle Ages, we investigate the events leading up to the 1277 actions, the condemned propositions, and the parts of these condemnations connected to modal (...) and temporal logic specifically. We show that because of the specific motivations late thirteenth-century and fourteenth-century logicians had when working in modal and temporal logic, the effect of the 1277 condemnations on the development of those branches was much smaller than might have been supposed. (shrink)

The current trend in knowledge revision in the Dynamic Epistemic Logic tradition focuses on the addition of new knowledge, rather than the possibility of losing knowledge. Yet there are natural situations, such as an agent who does not want another agent to know that she knows a certain piece of information, where there is a need to be able to model the retraction of a proposition from a knowledge base. One situation where this is systematically required is the variant of (...) the medieval theory of obligationes known as dubitatio, where one of the agents in the dialogue is obliged to hold the initial proposition, the dubitatum, as doubtful, regardless of what other propositions she may concede or deny during the disputation. In this paper, we use dubitatio as a motivation for studying deceitful agents, and we discuss various ways that an agent can move from a model where f is known to one where f is not known. (shrink)

Journal Name: Apeiron Issue: Ahead of print.

This qualitative study examines the expectations and beliefs parents, students, and teachers have about the teaching of heritage histories in public high schools. Students from three heritage groups, as well as their parents and teachers, were interviewed to shed light on this complex, often silent, relationship. This study is grounded in literature about the purposes of history education, historical distance, and collective memory/heritage, which give shape to and help to explicate some of the more complex issues inherent in the teaching (...) of heritage histories. Participants included four Hmong students, three of their parents, and their teacher in St. Paul, Minnesota; eight Chinese students, nine of their parents, and their teacher in Elmdale, California; and five Jewish students, five of their parents, and their teacher in Maple Lake, Illinois. Findings indicate that the three stakeholder groups believe that the public school history classroom is an appropriate and desired place for heritage histories to be taught. This is complicated, however, by several factors: the placement of the heritage history narratives within larger curricular and mainstream narratives, how the teachers choose to incorporate the heritage narratives into the formal classroom curriculum, and the changing nature of historical and generational distance. (shrink)

Temporal logic as a modern discipline is separate from classical logic; it is seen as an addition or expansion of the more basic propositional and predicate logics. This approach is in contrast with logic in the Middle Ages, which was primarily intended as a tool for the analysis of natural language. Because all natural language sentences have tensed verbs, medieval logic is inherently a temporal logic. This fact is most clearly exemplified in medieval theories of supposition. As a case study, (...) we look at the supposition theory of Lambert of Lagny, extracting from it a temporal logic and providing a formalization of that logic. (shrink)

Argues that Socrates’s fundamental role in the dialogues is to guide us toward self-inquiry and self-knowledge. In this highly original and provocative book, Sara Ahbel-Rappe argues that the Platonic dialogues contain an esoteric Socrates who signifies a profound commitment to self-knowledge and whose appearances in the dialogues are meant to foster the practice of self-inquiry. According to Ahbel-Rappe, the elenchus, or inner examination, and the thesis that virtue is knowledge, are tools for a contemplative practice that teaches us how (...) to investigate the mind and its objects directly. In other words, the Socratic persona of the dialogues represents wisdom, which is distinct from and serves as the larger space in which Platonic knowledge—ethics, epistemology, and metaphysics—is constructed. Ahbel-Rappe offers complete readings of the Apology, Charmides, Alcibiades I, Euthyphro, Lysis, Phaedrus, Theaetetus, and Parmenides, as well as parts of the Republic. Her interpretation challenges two common approaches to the figure of Socrates: the thesis that the dialogues represent an “early” Plato who later disavows his reliance on Socratic wisdom, and the thesis that Socratic ethics can best be expressed by the construct of eudaimonism or egoism. (shrink)

The origins of field guides and other plant identification manuals have been poorly understood until now because little attention has been paid to 18th century botanical identification guides. Identification manuals came to have the format we continue to use today when botanical instructors in post-Revolutionary France combined identification keys with the "natural method" and alphabetical indexes. Botanical works featuring multiple but linked techniques to enable plant identification became very popular in France by the first decade of the 19th century. British (...) botanists, however, continued to use Linnaeus's sexual system almost exclusively for another two decades. Their reluctance to use other methods or systems of classification Can be attributed to a culture suspicious of innovation, anti-French sentiment and the association of all things Linnaean with English national pride, fostered in particular by the President of the Linnean Society of London, Sir James Edward Smith. The British aversion to using multiple plant identification technologies in one text also helps explain why it took so long for English botanists to adopt the natural method, even after several Englishmen had tried to introduce it to their country. Historians of ornithology emphasize that the popularity of ornithological guides in the 19th and 20th centuries stems from their illustrations, illustrations made possible by printing technologies that improved illustration quality and reduced costs. Though illustrations are the most obvious features of late 19th century and 20th century guides, the organizational principles that make them functional as identification devices come from techniques developed in botanical works in the 18th century. (shrink)

In recent years there has been a growth of single-issue campaigns in western democracies and a proliferation of groups attempting to exert political influence and achieve social change. In this context, it is important to consider why individuals do or don't get involved in collective action, for example in the trade union movement and the women's movement. Social psychologists have an important contribution to make in addressing this question. The social psychological approach directly concerns the relationship between the individual and (...) society and a number of theories have been developed in the field, particularly by contemporary European researchers. Yet, surprisingly, there has never been, until now, a concerted attempt to bring these various strands of research together in a coherent, detailed presentation of the social psychological approach to collective action. The authors of _The Social Psychology of Collective Action _review and integrate a number of theories developed in this field as well as presenting their own original research and data. The research discussed in the book ranges over a number of different contexts, with a particular focus on women's groups organizing around issues of gender. Questions addressed include: why do women get involved in women's groups? What part is played by experiences of discrimination in the family and in the workplace? What are the benefits of group involvement? How are feminist activists perceived by others who choose not to get involved? Findings from questionnaires and interviews are integrated with contemporary social psychological theory, especially social identity theory. (shrink)

Although rhetoric is not a category of ancient Indian philosophy, this paper argues that Śāntarakṣita and Kamalaśīla, 2 eighth-century Indian Buddhist philosophers, can nonetheless be seen to embrace a rhetorical conception of rationality. That is, while these thinkers are strong proponents of rational analysis and philosophical argumentation as tools for attaining certainty, they also uphold the contingent nature of all such processes. Drawing on the categories of the New Rhetoric, this paper argues that these Buddhist thinkers understand philosophical argumentation to (...) be directed at a universal audience of rational beings, where this universal audience is not an actual audience but a rhetorical one constructed through the author’s particular and historically contingent conception of what counts as rational. A reception theory of rationality is one that holds that the rationality of an argument depends upon its acceptance by a rational audience. When philosophers recognize the historically contingent nature of what counts as rational, they can embrace a reception theory of rationality that neither reduces the rational to mere opinion nor restricts it to a single, absolute, and timeless standard. (shrink)

The purpose of this article is to present a case for the value of argumentation as an instrument of rational persuasion in doctor-patient (and general health professional–patient) communication. By doing so, I also emphasize the value of argumentation theory—as a body of knowledge devoted to the study of argumentation—both to enrich the study of doctor-patient communication and to enhance its quality by contributing to dedicated training courses for health professionals and patient education interventions. Argumentation is used in health professional–patient interactions, (...) and its significance in this context has been acknowledged in recent literature (see the collection of articles in Rubinelli and .. (shrink)

The chapter explicates the central resources that classical Husserlian phenomenology and its contemporary elaborations offer for the study of psychic disorders. We shall first discuss the phenomenological principles that enable analysis of the conditions and limits of experiencing and sense-constitution. We shall then clarify the concepts that phenomenologists have developed for the discussion of the normality and abnormality of experiencing—optimality and concordance—while also paying heed to the types of phenomena that classical and contemporary phenomenologists have tackled while developing their methods. (...) In this vein, we will emphasize methodological factors that separate phenomenological studies of intentional experiencing from empirical studies of human behavior and psyche, on the one hand, and from alternative philosophical studies of the mind and consciousness, on the other hand. In sum, our chapter shows that phenomenology offers powerful tools for the systematic investigation of several different types of experiential disorders (such as depression and psychosis). (shrink)

In 2017, British shock-artist Damien Hirst released a coffee-table book with photographs from his Venice Biennale exhibition, Treasures from the Wreck of the Unbelievable, featuring artifacts retrieved from a Roman-era shipwreck in the Indian Ocean. The following year, a “documentary” was released on Netflix featuring the backstory of the wreck's excavation, showing how all those coral-encrusted antiquities made their way from the seafloor to the art scene. At this same time and elsewhere in Britain, a practitioner of art history, art, (...) and maritime archaeology was in the process of developing the concept of “hauntography” as an object-oriented artistic method that represents (visually or otherwise) the ontological absent-presence of shipwrecks, that is, as objects that defy complete phenomenological access, while inspiring speculation into the uncanniness of being a thing of anthropogenic origin, but which persists beyond anthropos. Because both hauntography and Hirst's project make claims regarding epistemological and phenomenological limits pertaining to underwater wreckage, this article answers the question first posed by the author's students as to whether Hirst's satirical take on shipwreck archaeology ought to be considered the first hauntograph. By examining the relationships between two contemporary art projects, underwater archaeology, and object-oriented philosophies, this article considers how art objects might nudge epistemological limits without resorting to a post-truth dismissal of objective reality. (shrink)

Since the seminal works of Draper and Harpending (1982) and Belsky et al. (1991) there has been considerable interest in the link between the family environment experienced as a child and consequent mating and reproductive strategy of females. In this paper, predictions from the hypothesis were tested using postal survey data from a cross-section of 415 women in Merseyside, UK. No relationships were found between father-absence, unrelated male-presence, parental divorce or parental death with age at first coitus, number of sexual (...) partners, mean length of sexual relationships or mean length of relationships prior to coitus occurring. (shrink)

We hypothesize that juvenile baboons are less efficient foragers than adult baboons owing to their small size, lower level of knowledge and skill, and/or lesser ability to maintain access to resources. We predict that as resources are more difficult to extract, juvenile baboons will demonstrate lower efficiency than adults will because of their lower levels of experience. In addition, we hypothesize that juvenile baboons will be more likely to allocate foraging time to easier-to-extract resources owing to their greater efficiency in (...) acquiring those resources.We use feeding efficiency and time allocation data collected on a wild, free-ranging, non-provisioned population of chacma baboons (Papio hamadryas ursinus) in the Moremi Wildlife Reserve, Okavango Delta, Botswana to test these hypotheses. The major findings of this study are:1. Juvenile baboons are significantly less efficient foragers than adult baboons primarily for difficult-to-extract resources.We propose that this age-dependent variation in efficiency is due to differences in memory and other cognitive functions related to locating food resources, as is indicated by the greater amount of time juvenile baboons spend searching for food. There is no evidence that smaller body size or competitive disruption influences the differences in return rates found between adult and juvenile baboons in this study.2. An individual baboon’s feeding efficiency for a given resource can be used to predict the duration of its foraging bouts for that resource.These results contribute both to our understanding of the ontogeny of behavioral development in nonhuman primates, especially regarding foraging ability, and to current debate within the field of human behavioral ecology regarding the evolution of the juvenile period in primates and humans. (shrink)

Norenzayan, Smith, Jun Kim, and Nisbett (2002) investigated cultural differences in the use of intuitive versus formal reasoning in 4 experiments. Our comment concerns the 4th experiment where Norenzayan et al. reported that, although there were no cultural differences in accuracy on abstract logical arguments, Koreans made more errors than U.S. undergraduates in judging the logical validity of concrete arguments. Norenzayan et al. concluded that Koreans are less likely than European Americans to decontextualize an argument's content from its logical structure, (...) as Koreans were more likely to consider the believability of the conclusion when assessing an argument's validity (a belief bias). Notably, Korean participants were more conservative (less likely to say an argument is valid) than European American participants when assessing arguments. An analysis of the average of the hit and correct rejection rates in each of the conditions (abstract, concrete–believable, concrete–nonbelievable) revealed that, contrary to conclusions of Norenzayan et al., European Americans were no better than Koreans at determining the validity of concrete deductive arguments with conclusions varying in believability. (shrink)