A general framework for analysing the effects of variability and the effects of interruptions on foraging is presented. The animal is characterised by its level of energetic reserves, x. We consider behaviour over a period of time [0,T]. A terminal reward function R(x) determines the expected future reproductive success of an animal with reserves x at time T. For any state x at a time in the period, we give the animal a choice between various options and then constrain it (...) to follow a background strategy. The best option is the one that maximizes expected future reproductive success. Using this framework, we show that sensitivity to variability in amount of energy gained is logically distinct from sensitivity to variability in the time at which food is obtained. We also show that incorporating interruptions results in both a preference for variability in time and a preference for a reward followed by a delay as opposed to the same delay before the reward. (shrink)

We present a general framework for analyzing the contribution to reproductive success of a behavioural action. An action may make a direct contribution to reproductive success, but even in the absence of a direct contribution it may make an indirect contribution by changing the animal's state. We consider actions over a period of time, and define a reward function that characterizes the relationship between the animal's state at the end of the period and its future reproductive success. Working back from (...) the end of the period using dynamic programming, the optimal action as a function of state and time can be found. The procedure also yields a measure of the cost, in terms of future reproductive success, of a suboptimal action. These costs provide us with a common currency for comparing activities such as eating and drinking, or eating and hiding from predators. The costs also give an indication of the robustness of the conclusions that can be drawn from a model. We review how our framework can be used to analyze optimal foraging decisions in a stochastic environment. We also discuss the modelling of optimal daily routines and provide an illustration based on singing to attract a mate. We use the model to investigate the features that can produce a dawn song burst in birds. State is defined very broadly so that it includes the information an animal has about its environment. Thus, exploration and learning can be included within the framework. (shrink)

John Maynard Smith was the founder of evolutionary game theory. He has also been the major influence on the direction of this field, which now pervades behavioural ecology and evolutionary biology. In its original formulation the theory had three components: a set of strategies, a payoff structure, and a concept of evolutionary stability. These three key components are still the basis of the theory, but what is assumed about each component is often different to the original assumptions. We review (...) modern approaches to these components. We emphasis that if a game is considered in isolation, and arbitrary payoffs are assumed, then the payoffs may not be consistent with other components of the system which are not modelled. Modelling the whole system, including not only the focal game, but also the future behaviour of the players and the behaviour of other population members, allows a consistent model to be constructed. We illustrate this in the case of two models of parental care, showing how linking a focal game to other aspects of the system alters what is predicted. (shrink)

It is shown that in a range of models, the probability that a forager dies from starvation is, to a good approximation, an exponential function of energy reserves. Using a time and energy budget for a 19g passerine, we explore the consequences, in terms of starvation and predation, of various levels of energy reserves. It is shown that there exists an optimal level L of reserves at which total mortality (starvation plus predation) is minimized. L increases when the environment deteriorates (...) as a result of a decrease in either temperature or mean gross gain or an increase in the mean search time. The effect of combined deteriorations is greater than the sum of their individual effects. At L, the probability of predation is much higher than the probability of starvation. A simple analytic model suggests that this result will be fairly general, but also indicates conditions under which the result might not hold. (shrink)

Matrix population models provide a natural tool to analyse state-dependent life-history strategies. Reproductive value and the intrinsic rate of natural increase under a strategy, and the optimal life-history strategy can all be easily characterised using projection matrices. The resultant formulae, however, are not directly comparable with the corresponding formulae for age structured populations such as Lotka's equations and Fisher's formula for reproductive value. This is because formulae involving projection matrices lose track of what happens to an individual over its lifetime (...) and are only concerned with expected numbers of descendants one time step in the future. In contrast the usual age-dependent formulae explicitly followed a single individual through from birth to death.In this paper I show how the state-dependent formulae can be rewritten to be directly comparable with the standard age-structured formulae. Although the formulae are intuitively obvious the decomposition into current and future reproductive success differs from that previously given and is, I suggest, a more natural definition. The derivation of appropriate equations for optimal life-histories relies on results from dynamic programming theory; and is much more general and easier than previous derivations. (shrink)

Rolls discusses various adaptive explanations of physiological processes and the emotions. We give a critical analysis of some of these from the perspective of behavioural ecology. While agreeing with the approach adopted by Rolls, we identify topics that could have been better presented by making use of the existing literature.

This is a review of John Horty's book, _Agency and Deontic Logic_, OUP 2000.

John Rawls begins a Theory of Justice with the observation that 'Justice is the first virtue of social institutions, as truth is of systems of thought… Each person possesses an inviolability founded on justice that even the welfare of society as a whole cannot override'1. The COVID-19 pandemic has resulted in lock-downs, the restriction of liberties, debate about the right to refuse medical treatment and many other changes to the everyday behaviour of persons. The justice issues it raises are (...) diverse, profound and will demand our attention for some time. How we can respect the Rawlsian commitment to the inviolability of each person, when the welfare of societies as a whole is under threat goes to the heart of some of the difficult ethical issues we face and are discussed in this issue of the Journal of Medical Ethics. The debate about ICU triage and COVID-19 is quite well developed and this journal has published several articles that explore aspects of this issue and how different places approach it.2–5 Newdick et al add to the legal analysis of triage decisions and criticise the calls for respecting a narrow conception of a legal right to treatment and more detailed national guidelines for how triage decisions should be made.6 They consider scoring systems for clinical frailty, organ failure assessment, and raise some doubts about the fairness of their application to COVID-19 triage situations. Their argument seems to highlight instances of what is called the McNamara fallacy. US Secretary of Defense Robert McNamara used enemy body counts as a measure …. (shrink)

Alexis de Tocqueville asserted that America had no truly great literature, and that American writers merely mimicked the British and European traditions of the eighteenth and nineteenth centuries. This new edited collection masterfully refutes Tocqueville's monocultural myopia and reveals the distinctive role American poetry and prose have played in reflecting and passing judgment upon the core values of American democracy. The essays, profiling the work of Mark Twain, F. Scott Fitzgerald, John Updike, Edith Wharton, Walt Whitman, Henry James, Willa (...) Cather, Walker Percy, and Tom Wolfe, reveal how America's greatest writers have acted as society's most ardent cheerleaders and its most penetrating critics. Christine Dunn Henderson's exciting new work offers literature as a portal through which to view the philosophical principles that animate America's political order and the mores which either reinforce or undermine them. (shrink)

Jecker et al. (2024) propose seven ethical principles to guide international bioethics conferencing, applying them to the selection of Qatar as the location for the 2024 World Congress of Bioethics...

Galasso (2024) reiterates the problem of medical research being grounded on data from people with European ancestry and subsequently describes efforts made by the All of Us Research Program in the...

An Indexed Synopsis of the Grammar of Assent by John J. Toohey. This book is a reproduction of the original book published in 1906 and may have some imperfections such as marks or hand-written notes.

A key philosophical feature of Peter Jackson’s film interpretation of J.R.R. Tolkien’s The Lord of the Rings is its use of fantasy to inspire a “recovery” of the actual or, in other words, a reawakening to the beauty of nature and the many possible ways of living in healthier ecological relation to the world. Though none of these ways is perfectly achieved, this pluralistic view is demonstrated in the various lifeways of Hobbits, Elves, Men, and Ents. All of the positive (...) relationships embodied in the films—to trees, mountains, horses, and vegetable gardens—involve loving care and attention, receiving nourishment and livelihood without instrumentalization, or reducing nature to mere resource. The films also vividly display a variety of ugly and destructive ways of using the land to accrue power and wealth. These noxious ways, specifically because they actively destroy the lands that they use, always need more. They will thus eventually annihilate the beautiful ways of being if they are not actively resisted. Some of those who would rather be tending their own trees, gardens, or horses or even wandering in the wild forests must therefore turn their attention to struggle and resistance instead. This is a struggle full of grief, and at times even verging on despair, but it is marked by the refusal to give up hope. Indeed, what Jackson and Tolkien have to say about hope is as important in responding to the ecological crisis as anything they have to say about nature, inasmuch as they help to remind us that even in our own times, “there is still hope.”. (shrink)

With a vast majority of the land in the Driftless Region of the Midwestern United States dedicated to agricultural production, the future of farming has significant economic, social, recreational, agricultural, and ecological implications. An important literature stream has developed on ways agriculture can change to impact both human and ecological communities positively. In this study, we examine the processes and extent to which community narratives assert and inform regional identities that shape the meaning of being a good farmer. Using a (...) mixed methods approach, we examine what farmers consider good farming and how they utilize community narratives to assert their perspective of good farming. Employing a correlational analysis, we examined the relative importance of the four dimensions of good farming (productivist, conservationist, civic-minded, and naturalist). In addition, we used narrative analysis to explore the development of community narratives that assert a multi-dimensional view of good farming. Data for this study was collected through 21 semi-structured interviews with farmers, two focus groups of farmers, and a survey of farmers with 82 survey participants. The mean scores for conservationist, civic-minded, and naturalist dimensions were significantly higher than those for productivists. There was no significant correlation between the productivists dimension and the three other dimensions of good farming. Through analysis of transcripts, we identified a community narrative that actively problematized a dominant cultural narrative centered on production agriculture. Collectively, a community narrative is emerging in the Driftless Region that sought to normalize agricultural practices that promote profitable farms, vibrant communities, and a wide array of ecosystem services. (shrink)

This volume attempts to give a short account of Herbert Spencer's life, an appreciation of his characteristics, and a statement of some of the services he rendered to science. Prominence has been given to his Autobiography, to his Principles of Biology, and to his position as a cosmic evolutionist; but little has been said of his psychology and sociology, which require another volume, or of his ethics and politics, or of his agnosticism-the whetstone of so many critics. Our appreciation of (...) Spencer's services is therefore partial, but it may not for that reason fail in its chief aim, that of illustrating the working of one of the most scientific minds that ever lived, -whose excess of science was almost unscientific.-. (shrink)

Despite recurring efforts, a gap exists across a variety of contexts between the protection of patients' safety in theory and in practice. This timely Research Handbook highlights these critical issues and suggests both legal and policy changes are necessary to better protect patients' safety. Multidisciplinary in nature, this Research Handbook features contributions from eminent academics, policy makers and medical practitioners from the Global North and South, discussing the essential facets concerning patient safety and the law. It highlights how the role (...) of legislation and case law has the potential to influence, both positively and negatively, medical practice and the quality of care. Chapters explore patient safety and the global health agenda; physiotherapy; 'non-therapeutic' clinical research with children; patient safety awareness in healthcare education; and the increasing use of robotics and artificial intelligence in healthcare. Outlining a wide range of international perspectives on patient safety and the law, this Research Handbook will appeal to academics and researchers specialising in health and medical law, human rights and healthcare regulation. It will also serve as a valuable resource for legal and medical practitioners alike, as well as clinicians and professionals working in healthcare governance. (shrink)

The sequence is made up of select texts of the Aristotelian Organon, mostly the opening chapters of each treatise, in the traditional order, where Aristotle lays out the primary elements of reasoning. Study aids accompany these primary texts..." [taken from back cover].

This superb collection by the eminent physicist and critic John Ziman, opens with an album of portraits of scientists--Albert Einstein, Freeman Dyson, Lev Landau, Mark Azbel, Andrei Sakharov. Ziman takes readers into the world of the contemporary scientist, showing how discoveries are made and how claims are tested. He then travels into the minds of scientists as they are drawn into competing directions. Here Ziman exposes the path of discovery, which is strewn with complex human needs, governmental restrictions, the (...) desire for profits, and the exercise of technical virtuosity. (shrink)

In this book John Ziman seeks the answers to crucial questions facing scientists who need to change the direction of their careers.

The essays in this volume blend historical and philosophical reflection with concern for contemporary political problems. They show that the causes and motivations of civil religion are a permanent fixture of the human condition, though some of its manifestations and proximate causes have shifted in an age of multiculturalism, religious toleration, and secularization.

While previous studies of Dewey's work have taken either a historical or topical focus, Shook offers an innovative, organic approach to understanding Dewey and eloquently shows that Dewey's instrumentalism grew seamlessly out of his idealism. He argues that most current scholarship operates under a mistaken impression of Dewey's early philosophical positions.