We study the handicap principle in terms of the Sir Philip Sidney game. The handicap principle asserts that cost is required to allow for honest signalling in the face of conflicts of interest. We show that the significance of the handicap principle can be challenged from two new directions. Firstly, both the costly signalling equilibrium and certain states of no communication are stable under the replicator dynamics ; however, the latter states are more likely in cases where honest signalling should (...) apply. Secondly, we prove the existence and stability of polymorphisms where players mix between being honest and being deceptive and where signalling costs can be very low. Neither the polymorphisms nor the states of no communication are evolutionarily stable, but they turn out to be more important for standard evolutionary dynamics than the costly signalling equilibrium. (shrink)

Food media have become a formidable part of adolescents’ food environments. This study sought to explore how and why adolescents use food media by focusing on selectivity and motives for consumption. We conducted in-depth, semi-structured interviews with 31 Flemish adolescents aged 12 to 16. Food media were both incidentally consumed and selectively sought for education, social utility, and entertainment. The levels of selectivity and motives for consumption varied among the different food media platforms. Incidental consumption was more prevalent with TV (...) cooking shows compared to online food media. The dominant motives for TV cooking show consumption were companionship and entertainment, while online food media were used for a more diverse range of motives dominated by information/inspiration and social interaction. Some participants consumed food media to get motivation and inspiration to improve health and fitness while others consumed food media to watch appetizing and aesthetically pleasing food content. The social environment in the form of friends and family as well as existing food preferences were dominant psychosocial factors for both traditional and online food media use. Future research is warranted to explore how incidental exposure and the identified motives for use relate to food media effects. (shrink)

The considerable attention to financial interests in clinical research has focused mostly on academic medical centers, even though the majority of clinical research is conducted in community practice settings. To fill this gap, this article maps the practices and policies in 73 community hospitals and several hundred specialized facilities around the country for reviewing clinical investigators’ financial relationships with research sponsors. Community hospitals face a substantially different mix of issues than academic medical centers do because their physician researchers are usually (...) not employees, and more of their studies are later-phase, multicenter trials. Accordingly, community physicians stand to benefit personally from per capita payments, but they tend to have less direct influence over research findings when compared with their academic peers. These and other contrasts require separate guidance for community-based organizations that takes into account their particular needs, circumstances, and institutional capacities. (shrink)

The growing literature on how people learn to make decisions based on experience focuses on two types of paradigms. In one paradigm, people are faced with a choice, and must retrospectively consult past experience of similar choices to decide what to do. In the other paradigm, people are faced with a choice, and then have the opportunity prospectively to gather new experiences that might help them make that choice. The current paper examines the joint impact of both retrospective and prospective (...) experiences. Two experiments reveal strong interactions. In Study 1, repeated experience with new samples appears to reduce sensitivity to the average outcome in the samples and enhances underweighting of rare events. Study 2 shows that repeated experience with pre-choice samples can reverse the impact of the new information. The results suggest that prospectively gathering new samples can have two, potentially contrasting, influences on choice: the first focuses on the sample’s face value and selects the option with the higher value in the new sample; by contrast, the second treats the new sample as a cue to recall similar prior experiences, which in turn drive choice. The paper concludes with a discussion of the possibility that part of the descriptive value of prospect theory reflects the fact that it summarizes the joint impact of similar “face-or-cue” processes. (shrink)

Brexit activists demonstrating outside the British Houses of Parliament were studied in situ to examine their potential for pro-group extreme behavior. This involved activists of two polarized, opposing views; those of Leave and Remain. The research engaged concepts linking the different theoretical perspectives of identity fusion and personal construct psychology. The study measured participants' degree of fusion to their group using a verbal measure. Willingness to undertake extreme acts was assessed in several ways: a measure of willingness to fight for (...) the group, adaptations of the trolley dilemma and questions regarding political violence. Individual construing was examined using repertory grid technique and a semi-structured interview. Results were similar for both Leave and Remain participants. The majority of activists identified as “fused” to their group and, if so, were more likely to undertake hypothetical extreme behavior compared to those who did not identify as “fused.” Repertory grid technique indicated that becoming an activist provided individuals with a clearer and more positive view of themselves. Opposition activists were construed more negatively and extremely than fellow activists, and this construal was associated with an increased willingness to undertake extreme pro-group behavior. This was consistent with the personal construct model of radicalization and was heightened in those who were “fused.” Interview data provided support for the constructivist model and revealed characteristics and concerns of the two groups. Overall, the findings indicate that campaigning organizations contain fused individuals, who are more likely to undertake hypothetical pro-group violence including self-sacrifice. This has broader implications which may be particularly pertinent, given the violent impact of extremist activists around the globe. (shrink)

In this paper we show that there are certain limits as to what applications of Maynard Smith’s concept of evolutionarily stable strategy can tell us about evolutionary processes. We shall argue that ESS is very similar in spirit to a particular branch of rational choice game theory, namely, the literature on refinements of Nash equilibrium. In the first place, ESS can also be viewed as a Nash equilibrium refinement. At a deeper level, ESS shares a common structure with other rational (...) choice equilibrium refinements. An equilibrium is evaluated according to whether it persists under specific kinds of perturbations. In the case of ESS, these perturbations are mutations. However, from a dynamical point of view, focusing exclusively on perturbations of equilibria provides only a partial account of the system under consideration. We will show that this has important consequences when it comes to analyzing game-theoretic models of evolutionary processes. In particular, there are non-ESS states which are significant for evolutionary dynamics. (shrink)

William Burnside was one of the three most important algebraists who were involved in the transformation of group theory from its nineteenth-century origins to a deeper twentieth-century subject. Building on work of earlier mathematicians, they were able to develop sophisticated tools for solving difficult problems. His works are of enormous historical importance; they remain also a source of inspiration and information. The works of his contemporaries, such as Klein, Frobenius, Schur, have been published as also have the works of his (...) immediate successors such as Phillip Hall. All of Burnside's papers are reproduced here, organized chronologically and with a detailed bibliography. Walter Feit has contributed a foreword, and a collection of introductory essays are included to provide a commentary on Burnside's work and set it in perspective along with a modern biography that draws on archive material. This is the first reference volume of Burnside's collected papers, enhanced by a series of critical essays on his work, and is important for group theorists and historians and philosophers of mathematics and fills the gap in this area of literature. (shrink)

ABSTRACT This paper argues that striving is a cardinal virtue in sport and life. It is an overlooked virtue that is an important component of human happiness and a source of a sense of dignity. The human psychological capacity for striving emerged as a trait for addressing the entropic features of our existence, but it can be engaged and used for other purposes. Sport is one such example. Sport appears exceptional in being designed specifically to test and display our capacities (...) to strive. Although striving is connected to pursuit of excellence in sport, it supports a more democratic conception of the value of sport than achievement-oriented perfectionist accounts. (shrink)

I Have argued elsewhere, and still believe, that the Phaedo was written before Plato's first journey to Italy, when the strong Pythagorean influences displayed in that dialogue were reaching him through the Pythagorean centres on the Greek mainland, in particular Phleius and Thebes; and that in the Republic and Phaedrus it is possible to trace equally strong Pythagorean influence but different in detail, because Plato had now come into contact with the Pythagoreans who still remained in Italy, particularly Archytas. The (...) most remarkable of these influences from whatever source was the doctrine of the immortality and transmigration of the soul, which we know to have been held by the earliest Pythagorean society, and the account of the soul's experience in the world below. (shrink)

This comprehensive and important volume includes contributions by activists, journalists, lawyers and scholars from twenty-one countries. The essays map the directions the movement for women's rights is taking--and will take in the coming decades--and the concomittant transformation of prevailing notions of rights and issues. They address topics such as the rapes in former Yugoslavia and efforts to see that a War Crimes Tribunal responds; domestic violence; trafficking of women into the sex trade; the persecution of lesbians; female genital mutilation; and (...) reproductive rights. (shrink)

The American Society for Microbiology addresses issues of research integrity in several ways. There is a Code of Ethics for Society members and an Ethics Committee, a Publications Board has editorial oversight of ethical issues involved in Society journals and other publications, and the Public and Scientific Affairs Board is involved in ethical issues and scientific policies at the national level. In addition, the Society uses meetings and publications to inform and educate members about research integrity.

This paper argues that for the purposes of any sort of serious discussion about immoral conduct in sport very little is illuminated by claiming that the conduct in question is cheating. In fact, describing some behavior as cheating is typically little more than expressing strong, but thoroughly vague and imprecise, moral disapproval or condemnation of another person or institution about a wide and ill-defined range of improper advantage-seeking behavior. Such expressions of disapproval fail to distinguish cheating from many other types (...) of immoral conduct. The discussion shows that we should set the concept aside and assess the moral disapproval implied by claims of cheating by reference to the moral and other principles that underlie the practice of sport. This allows us to consider carefully the complexity of the issues that are raised when allegations of cheating are made and not be distracted by the emotionally loaded, conversation-stopping tendency of the concept. This means that some types of disputes in sport will be messy and demand more effort to resolve, but the payoff will be better informed and more thoughtful discussions and greater awareness of the moral complexity of sport and of its principled underpinnings. (shrink)

Hereditary structural completeness is established for a range of substructural logics, mainly without the weakening rule, including fragments of various relevant or many-valued logics. Also, structural completeness is disproved for a range of systems, settling some previously open questions.